Gm Hei Module Test

The ignition coil fires when the module shuts off voltage to the coil primary. Out of options on the side of the road, I called AAA and had it towed home. With the V2. The system consists of a control module and a magnetic pickup mounted in the distributor. On newer engines, the Crank Shaft Position Sensor performs this function. Also, it has a good aluminum body for adjusting perfectly for simple usage. Solid Brass Terminals: Motovecor brand provides high-quality manufacture and solid base design for adapting perfectly to the ignition module. In a GM HEI system, the module replaced the contacts of the breaker points and the pickup coil was substituted for the rubbing block and distributor cam. Your ECU should have a location where to set this offset, and once this is set, this location will become the new zero. I used a P4 intel heat sink on it. Duraspark conversion video. Test for power at the pink BAT terminal. 1-inch Stud Length. Touch the probe of the test light to the smaller terminal of the module--it's labeled "G" and had the Green pickup coil wire connected to it. Now, AutoZone can test it for you (if you remove it and take it to them), but for those of you that can't afford the time this involves or for those who want to add another diagnostic technique to their ‘toolbox’ of know-how, this article is for you. I replaced the module in the distributor. Connect the ground side of your test lamp to the battery POSITIVE cable. Look for carbon track from center contact on distributor cap to one of the coil mounting screws. 4L) This is a real life case study that will help you diagnose a hard to find misfire. The GM HEI distributor uses a hall effect for the triggering and sensing the No. I'm using an 81 DS2 dizzy and tried using an HEI ignotion module. I replaced the module in the distributor. If the light flickers when the ignition is cranked, you will need to check other components for a solution to. The ignition coil fires when the module shuts off voltage to the coil primary. To make sure it is not the hot wire, run a temporary jumper wire directly from the positive side of the battery to the distributor. This article describes how to upgrade a ZX ignition module to a GM HEI module. Thanks so I have concluded that my truck has been converted to the HEI and thus doesnt have a electronic spark control module, I bought a new cap, rotor, button, ignition coil, and ignition control module, took it for a test drive, it died put the old rotor, and ignition control module back on she runs again. One of these will go to the VR circuit input (DB37 pin #24) the other to ground. I found that the positve wire that i ran from the fuse block would make the speakers cut out qhen juat the outside got close to the speaker wires. Features: HEI Style. Now you get modern electronics (same as the $$$ HEI Distr has) that are available in every parts store. General Motors 1976908. 7L 1500, 2500, 3500 Pick Up and Suburban can be found here: Ignition System Circuit Diagram (1992-1995 Chevy/GMC Pick Up. The system consists of a control module and a magnetic pickup mounted in the distributor. 0 in it and a HEI ignition and Vacuum advance. I love to cross apply parts. Ive made sure all wires are in good shape. Then we'll check that the ignition control module is triggering the ignition coil. Model year coverage is from 1992 to 2013. The other is a wire that supplies power from the starter solenoid "R" terminal, it supplies power only when. GM Tech 2: This is the GM factory scan tool used in all GM dealers since 1996. org is great for info on my engine. The 7 Pin HEI Module. When mounting the GM 4-pin HEI module, always fasten it with dielectric, thermal or heat sink grease/paste on a clean, flat aluminum plate with plenty of fresh air circulation to dissipate the heat while in operation. Use a volt meter to test the hot wire while a buddy cranks the engine over. For GM vehicles prior to 1992 you will need a Tech1A or a MasterTech listed below to achieve OEM level functionality. Here is the DS distributor running a GM 4 wire ignition module. The 7 Pin HEI Module. The entire HEI system (except for the ignition coil on fuel injected engines) is contained within the distributor cap. A cold module will usually start working OK again for a short while. It will automatically advance the timing on acceleration a specific amount and retard the spark when decelerating and starting. Went out and bought new ignition module for hei distributor(no luck)then bought the part. 4L) This is a real life case study that will help you diagnose a hard to find misfire. Although this case study involves a 2000 Chevy Monte Carlo (with a 3. I found that the positve wire that i ran from the fuse block would make the speakers cut out qhen juat the outside got close to the speaker wires. Step 3 : Isolate the problem. GM Tech 2: This is the GM factory scan tool used in all GM dealers since 1996. The Stock GM HEI works well for the lower to mild end of the compression and RPM spectrum. 0L engines, is a pulse-triggered, transistorized controlled, inductive discharge ignition system. 0 in it and a HEI ignition and Vacuum advance. Heres my problem: I was driving along and I lost all power in the cab of the truck, the head lights worked but nothing else. I have an 86 f150 that I've taken the feedback carb and TFI dizzy out of. Last edited by resdoggie; 10-23-2021 at 10:24 AM. Features: HEI Style. General Motors 1976908. All hype aside if you combo is well under 12:1 compression ratio and or rarely sees continuous heavy load 5,000 RPM duty you have nothing to gain from other. I replaced the module in the distributor. There is much more on this on the GM HEI page. Not only that, you don't need any expensive tools to do it. Direct Replacement for Factory Unit. With the V2. ) If you get no spark when you REMOVE the test light probe from the “G” terminal,. 1-inch Stud Length. Touch the probe of the test light to the module terminal labeled "G". They break. If code 12 does not. The MSD module is a capacitor discharge module, and gives you a longer and hotter spark than the HEI. If the voltage drops below 10. The entire HEI system (except for the ignition coil on fuel injected engines) is contained within the distributor cap. Troubleshooting A Hard To Diagnose Misfire Case Study (GM 3. (Its the smaller of the two terminals that you disconnected the pickup coil wires from), and it’s the one that had the green wire on it. When you pull the probe OFF the terminal, you should hear a snap (the spark) from the coil. Touch the probe of the test light to the smaller terminal of the module--it's labeled "G" and had the Green pickup coil wire connected to it. When you pull the probe OFF the terminal, you should hear a snap (the spark) from the coil. With the V2. Looking for help on this, I have a 1978 fj40, did not have coil or ignition module when I got it so I am trying to do the 4 pin GM ignition module and standard 12 v coil set up. Get it Wed, Oct 27 - Mon, Nov 1. Duraspark conversion video. ACCEL 35362 High Performance Ignition Module for GM Remote Mount Coil HEI. The HEI just uses 12 volts. Test this by attaching a 12V test light to your spark plug terminals. To do this, connect a tune-up tach and dwell meter to the "TACH" terminal on the distributor cap and then start the engine. 1 cylinder location and the rpm of the engine. The purpose of the HEI install was to fix a sudden engine cut-out problem and a. Please help this bodyman test the system to know which component is bad. Step 2 : Check your Spark Plugs ( ignition module ) for current. How does one test an HEI coil? Ohms?. 4L V6), you can apply this info to any 3. 5, check your battery. The entire HEI system (except for the ignition coil on fuel injected engines) is contained within the distributor cap. The function of this component is to provide voltage to the ignition control module and ignition coil. Fits All GM Applications 73 to 89. Not only that, you don't need any expensive tools to do it. My problem is for whatever reason the coil will only fire for the first couple revolutions of cranking and then quit. A quick check on the HEI module can be done with a heat gun and a can of Freon refrigerant. HEI Distributor. (The test light will not light up on this test. Duraspark conversion video. To make sure it is not the hot wire, run a temporary jumper wire directly from the positive side of the battery to the distributor. You should have battery voltage w/ the key in the start and RUN positions. Solid Brass Terminals: Motovecor brand provides high-quality manufacture and solid base design for adapting perfectly to the ignition module. Check out the MSD HEI upgrade kit (or just buy the MSD HEI coil). About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators. FREE Shipping by Amazon. Mounting holes in the module body must be connected to engine/chassis ground (battery negative (-) post). I kept the coil from the upgrade kit and it doesn't skip a beat to 6200+ rpm. Step 3 - Check Spark Plug Current. All the points do is turn the module on and off, at low voltage and low current, so the points contacts last. Now you get modern electronics (same as the $$$ HEI Distr has) that are available in every parts store. I have an 86 f150 that I've taken the feedback carb and TFI dizzy out of. Anyway- HEI is really easy to diagnose, with a basic test light. 5 out of 5 stars 7. ) DIAGNOSING HEI COMPONENTS Photo 8. Hi , back again with a little more detail on my problem, have a buick 66 with a 350 chevy engine in it, started it up a week ago and it ran fine, this week i tried to start it and it cranks but no spark. To do this, connect a tune-up tach and dwell meter to the "TACH" terminal on the distributor cap and then start the engine. My module will not burn up. Step 3 - Check Spark Plug Current. Now you get modern electronics (same as the $$$ HEI Distr has) that are available in every parts store. Installed an hei dizzy into my 73 pickup and now my speakers cut in and out. Step 2 : Check your Spark Plugs ( ignition module ) for current. Motovecor HEI Distributor for Chevy gives 4-pin ignition module with a direct fit option for fast and easy set-up. It will automatically advance the timing on acceleration a specific amount and retard the spark when decelerating and starting. I kept the coil from the upgrade kit and it doesn't skip a beat to 6200+ rpm. When I say high and dry I'm talking about a vehicle that cranks around, but will not fire up. Still no spark. This is akin to the breakers opening. GM HEI control modules it was designed to use the 4 pin module to begin with. The HEI just uses 12 volts. Connect the positive test light lead to the ignition module signal wire. Testing a GM HEI Distributor, checking primary and secondary coil windings, pick up coil and bench top testing. 2 out of 5 stars. The heresy!:bawl:The forum on slantsix. To make sure it is not the hot wire, run a temporary jumper wire directly from the positive side of the battery to the distributor. The ignition system has two wires attached to the switch’s run terminal. In this Throwback Thursday, we're taking a small jump back to December 2017. If the light flickers when the ignition is cranked, you will need to check other components for a solution to. One of these will go to the VR circuit input (DB37 pin #24) the other to ground. Please help this bodyman test the system to know which component is bad. The 7 Pin HEI Module. If this has the GM HEI module, a high speed miss is not uncommon, it's just on it's upper limit. Not only that, you don't need any expensive tools to do it. Looking for help on this, I have a 1978 fj40, did not have coil or ignition module when I got it so I am trying to do the 4 pin GM ignition module and standard 12 v coil set up. All the points do is turn the module on and off, at low voltage and low current, so the points contacts last. Anyway- HEI is really easy to diagnose, with a basic test light. Connect the alligator clip of your test light to Battery + (maybe the alternator + terminal is closer) Touch the probe to any ground, the light should come on nice 'n' bright. How does one test an HEI coil? Ohms?. Big red wire- Has power with key on? Remove distributor cap, look for hole burnt in middle of rotor. A cold module will usually start working OK again for a short while. Easy tests for HEI system: 1. Still no spark. (cranking buddy not shown—see "Victoria's Secret" catalog models for suggestions for a helper. Orange and black going to C+ & B+ on the HEI coil, and the middle pin on the HEI is grounded. Pertronix D72000 Flame-Thrower HEI III 4 Pin Ignition Module (GM) 4. A quick check on the HEI module can be done with a heat gun and a can of Freon refrigerant. Connect the positive test light lead to the ignition module signal wire. The ignition system has two wires attached to the switch’s run terminal. I replaced the module in the distributor. Chances are you will never need to diagnose a code 12. Here is the DS distributor running a GM 4 wire ignition module. Hit the distributor housing with a full-hot blast from the heat gun to stress the module, and if it dies or misses, hit it with a squirt of liquid refrigerant for a quick cool-down. If the voltage drops below 10. How does one test an HEI coil? Ohms?. Good bye lean{lame**burn. If code 12 does not. In addition to the module shown above, you can use the HEI 8-pin module from the "small cap" HEI distributor. From the results you get, you'll be able to pinpoint the problem to the ignition. The Stock GM HEI works well for the lower to mild end of the compression and RPM spectrum. Also, it has a good aluminum body for adjusting perfectly for simple usage. FREE Shipping. The points and performance HEI were more evenly matched throughout the tests. org is great for info on my engine. Mounting holes in the module body must be connected to engine/chassis ground (battery negative (-) post). I love to cross apply parts. Spark testers: HEI on left, points-style or Chrys-ler electronic on right. Also, it has a good aluminum body for adjusting perfectly for simple usage. (cranking buddy not shown—see "Victoria's Secret" catalog models for suggestions for a helper. For GM vehicles prior to 1992 you will need a Tech1A or a MasterTech listed below to achieve OEM level functionality. Easy tests for HEI system: 1. One is the "resistance" power wire. To solve that i ran a relay so now i just have a signal wire inside the cab. The entire HEI system (except for the ignition coil on fuel injected engines) is contained within the distributor cap. This was used on 1987 through 1992 Camaro/Firebird Tuned Port Injection V8 engines, as well as 1987 to 1993 full size cars and 1987 to 1995 pick-up trucks, and V6 MPFI cars (such as the Fiero). If it's wired like points it will work on 9 volts but has problems being consistent especially at higher RPMs. Your ECU should have a location where to set this offset, and once this is set, this location will become the new zero. Step 3 : Isolate the problem. The distributor, in addition to housing the mechanical and vacuum advance mechanisms. The ignition coil fires when the module shuts off voltage to the coil primary. HEI is characterized by the incorporation of the ignition coil into the distributor cap for most applications. Look for carbon track from center contact on distributor cap to one of the coil mounting screws. As mentioned previously, you will also need to be sure that the electricity from the module is getting to the spark plugs as well. 4L V6), you can apply this info to any 3. Model year coverage is from 1992 to 2013. 5 out of 5 stars 7. Last edited by resdoggie; 10-23-2021 at 10:24 AM. At idle on a V-8, the dwell with a Delco module should be between 10 and 15 degrees. This article describes how to upgrade a ZX ignition module to a GM HEI module. Clip the negative test light lead to a solid ground such as negative battery terminal. The function of this component is to provide voltage to the ignition control module and ignition coil. It will automatically advance the timing on acceleration a specific amount and retard the spark when decelerating and starting. Ive made sure all wires are in good shape. Last edited by resdoggie; 10-23-2021 at 10:24 AM. module type AB14. From the results you get, you'll be able to pinpoint the problem to the ignition. The 7 Pin HEI Module. The Stock GM HEI System Is a well engineered system for most street hod-rodding applications. The HEI system, used on 2. 1-inch Stud Length. Chances are you will never need to diagnose a code 12. Get it as soon as Tue, Aug 17. Connect the alligator clip of your test light to Battery + (maybe the alternator + terminal is closer) Touch the probe to any ground, the light should come on nice 'n' bright. In this particular case, the ZX ignition module happened to be installed in a 1976 280Z which had been upgraded to a ZX distributor/ignition module using the Atlantic Z Club instructions. If the battery is fine, make sure the wire feeding the distributor is sufficient. I replaced the module in the distributor. It worked great. Now you get modern electronics (same as the $$$ HEI Distr has) that are available in every parts store. A Simple multi-meter can be used to test almost all of the parts in an HEI distributor. How do you test an ignition control module in GM? Step 1 : Check your ICM for current. The coil switching is handled by the module, so the ignition is "electronic" in that sense. based on the GM HEI module will allow you to get a replacement module nearly anywhere! Notes on wiring for a "points" distributor; There are normally two wires on the "+" terminal on the coil. The points and performance HEI were more evenly matched throughout the tests. In all, the stock HEI produced more horsepower than the points in a mere 6 out of 36 tests. Battery voltage at both the ignition coil and ignition control module. 4L GM equipped vehicle (see the Applies To box on the second column). Model coverage includes all makes and models of GM vehicles including passenger cars, trucks and vans. 4L) This is a real life case study that will help you diagnose a hard to find misfire. Step 3 : Isolate the problem. My module will not burn up. ACCEL 35362 High Performance Ignition Module for GM Remote Mount Coil HEI. David Vizard did some testing on the old-style V8 HEI mechanical advance distributors, and in Chevy Small Blocks on a Budget reported no problems with the magnetic pickups out past 6000 rpm. The system consists of a control module and a magnetic pickup mounted in the distributor. Troubleshooting A Hard To Diagnose Misfire Case Study (GM 3. Test for power at the pink BAT terminal. Your ECU should have a location where to set this offset, and once this is set, this location will become the new zero. It uses GM’s HEI module, with an additional 1uF filter capacitor on its 12V supply feed and a power zener diode on the HEI’s coil connection. 350 Chevy won't start!!!! Is there a way to test the coil and module to see which one needs replaced? I have 12-Volt at the Battery wire going to the distributor but she won't start!!!! I put one of those cross-fire caps/coils (puts 4-wires on each side) that makes a neat wire job on a show car about 3 years ago. In this particular case, the ZX ignition module happened to be installed in a 1976 280Z which had been upgraded to a ZX distributor/ignition module using the Atlantic Z Club instructions. HEI is characterized by the incorporation of the ignition coil into the distributor cap for most applications. Mounting holes in the module body must be connected to engine/chassis ground (battery negative (-) post). On newer engines, the Crank Shaft Position Sensor performs this function. 350 Chevy won't start!!!! Is there a way to test the coil and module to see which one needs replaced? I have 12-Volt at the Battery wire going to the distributor but she won't start!!!! I put one of those cross-fire caps/coils (puts 4-wires on each side) that makes a neat wire job on a show car about 3 years ago. 5, check your battery. I checked it with an inline spark. Check out the MSD HEI upgrade kit (or just buy the MSD HEI coil). Also know, how do I test my HEI ignition module? Turn the ignition ON. Touch the probe of the test light to the smaller terminal of the module--it's labeled "G" and had the Green pickup coil wire connected to it. Testing a GM HEI Distributor, checking primary and secondary coil windings, pick up coil and bench top testing. Direct Replacement for Factory Unit. So now I need to inspect the coil, and the wires which feed it and the module. A variable reluctor magnetic sensor typically has two wires, and possibly a shield wire. When I say high and dry I'm talking about a vehicle that cranks around, but will not fire up. 2 out of 5 stars. The purpose of the HEI install was to fix a sudden engine cut-out problem and a. A quick check on the HEI module can be done with a heat gun and a can of Freon refrigerant. Easy tests for HEI system: 1. The GM HEI distributor uses a hall effect for the triggering and sensing the No. This method can be used to start an engine that has some sort of after market digital fuel injection system as well. It worked great. Ive made sure all wires are in good shape. You should have battery voltage w/ the key in the start and RUN positions. I used a P4 intel heat sink on it. The Ignition Control Module or ICM is nothing more than a switch per se that turns the ignition system "On" or "Off". Troubleshooting A Hard To Diagnose Misfire Case Study (GM 3. Your ECU should have a location where to set this offset, and once this is set, this location will become the new zero. From the results you get, you'll be able to pinpoint the problem to the ignition. Also know, how do I test my HEI ignition module? Turn the ignition ON. The heresy!:bawl:The forum on slantsix. At idle on a V-8, the dwell with a Delco module should be between 10 and 15 degrees. I checked it with an inline spark. HEI Distributor. Touch the probe of the test light to the smaller terminal of the module--it's labeled "G" and had the Green pickup coil wire connected to it. Step 2 : Check your Spark Plugs ( ignition module ) for current. As a preview, Here is a little teaser video showing my conversion avail direct, using the optional round HEI coil. If the light flickers when the ignition is cranked, you will need to check other components for a solution to. Chances are you will never need to diagnose a code 12. The GM HEI distributor uses a hall effect for the triggering and sensing the No. It worked great. The typical ignition system circuit diagram for the 1992-1995 4. Turn the ignition ON. That's when we jumped head first into showing you what goes into diagnosing your HEI distributor with help from Performance Distributors when we published, HEI Distributor. This is akin to the breakers opening. It will automatically advance the timing on acceleration a specific amount and retard the spark when decelerating and starting. I initially installed one and later on stepped up to the MSD 6530 programmable ignition which is awesome, imo. GM HEI control modules it was designed to use the 4 pin module to begin with. 7L 1500, 2500, 3500 Pick Up and Suburban can be found here: Ignition System Circuit Diagram (1992-1995 Chevy/GMC Pick Up. The easiest way to test a module on the car is to ensure that the wiring & pickup coil are OK. Next, we'll verify that the ignition control module (ICM) is receiving the signal from the pick up coil. I'm using an 81 DS2 dizzy and tried using an HEI ignotion module. 5 out of 5 stars 7. The control module performs the same function as the breaker points in a points and condenser system. Looking for help on this, I have a 1978 fj40, did not have coil or ignition module when I got it so I am trying to do the 4 pin GM ignition module and standard 12 v coil set up. From the results you get, you'll be able to pinpoint the problem to the ignition. My module will not burn up. HEI 8-Pin Module. When mounting the GM 4-pin HEI module, always fasten it with dielectric, thermal or heat sink grease/paste on a clean, flat aluminum plate with plenty of fresh air circulation to dissipate the heat while in operation. The stock HEI didn't score its first horsepower win until the 4600-5000 range, and was exactly even 3 times in the 6100-6500 range. 1-inch Stud Length. Fits All V8, V6, and 4 Cylinder HEI Distributors. Touch the probe of the test light to the smaller terminal of the module--it's labeled "G" and had the Green pickup coil wire connected to it. Still no spark. When you pull the probe OFF the terminal, you should hear a snap (the spark) from the coil. Troubleshooting A Hard To Diagnose Misfire Case Study (GM 3. The distributor, in addition to housing the mechanical and vacuum advance mechanisms. Heres my problem: I was driving along and I lost all power in the cab of the truck, the head lights worked but nothing else. Went out and bought new ignition module for hei distributor(no luck)then bought the part. Clip the negative test light lead to a solid ground such as negative battery terminal. The easiest way to test a module on the car is to ensure that the wiring & pickup coil are OK. I love to cross apply parts. If this has the GM HEI module, a high speed miss is not uncommon, it's just on it's upper limit. How does one test an HEI coil? Ohms?. org is great for info on my engine. He did complain about the GM HEI switching modules though. Im bad with. As a preview, Here is a little teaser video showing my conversion avail direct, using the optional round HEI coil. There is much more on this on the GM HEI page. Touch the probe of the test light to the smaller terminal of the module--it's labeled "G" and had the Green pickup coil wire connected to it. You will notice a wire harness on the side of the module; the signal wire is the middle wire of the three. A cold module will usually start working OK again for a short while. If it's wired like points it will work on 9 volts but has problems being consistent especially at higher RPMs. Fits All GM Applications 73 to 89. How do you test an ignition control module in GM? Step 1 : Check your ICM for current. The system consists of a control module and a magnetic pickup mounted in the distributor. Troubleshooting A Hard To Diagnose Misfire Case Study (GM 3. A Simple multi-meter can be used to test almost all of the parts in an HEI distributor. Just so, how do I check my GM HEI module? Turn the ignition ON. When you pull the probe OFF the terminal, you should hear a snap (the spark) from the coil. Anyway- HEI is really easy to diagnose, with a basic test light. 7L 1500, 2500, 3500 Pick Up and Suburban can be found here: Ignition System Circuit Diagram (1992-1995 Chevy/GMC Pick Up. Your ECU should have a location where to set this offset, and once this is set, this location will become the new zero. Get it as soon as Tue, Aug 17. The easiest way to test a module on the car is to ensure that the wiring & pickup coil are OK. This is akin to the breakers opening. On newer engines, the Crank Shaft Position Sensor performs this function. The info from this thread Bypass Toyota Ignition and Coil I used the parts listed in the thread Ignition Module from a 1979 GM truck with a 350 CI engine Autozone P/N DR100. If it's wired like points it will work on 9 volts but has problems being consistent especially at higher RPMs. When I say high and dry I'm talking about a vehicle that cranks around, but will not fire up. A quick check on the HEI module can be done with a heat gun and a can of Freon refrigerant. For GM vehicles prior to 1992 you will need a Tech1A or a MasterTech listed below to achieve OEM level functionality. Also know, how do I test my HEI ignition module? Turn the ignition ON. A variable reluctor magnetic sensor typically has two wires, and possibly a shield wire. That's when we jumped head first into showing you what goes into diagnosing your HEI distributor with help from Performance Distributors when we published, HEI Distributor. At idle on a V-8, the dwell with a Delco module should be between 10 and 15 degrees. Orange and black going to C+ & B+ on the HEI coil, and the middle pin on the HEI is grounded. (I always keep a spare just in case). Here is the DS distributor running a GM 4 wire ignition module. Next, we'll verify that the ignition control module (ICM) is receiving the signal from the pick up coil. Then we'll check that the ignition control module is triggering the ignition coil. Hit the distributor housing with a full-hot blast from the heat gun to stress the module, and if it dies or misses, hit it with a squirt of liquid refrigerant for a quick cool-down. Rather, the problem would be a crank, no-start condition. To do this, connect a tune-up tach and dwell meter to the "TACH" terminal on the distributor cap and then start the engine. Today, there are several aftermarket high- performance modules and coils that can be added to a stock GM HEI distributor to give it excellent spark energy and rpm potential up to 7,000 rpm. The entire HEI system (except for the ignition coil on fuel injected engines) is contained within the distributor cap. How To Test Ignition Switch: The Procedure. Step 3 : Isolate the problem. (The test light will not light up on this test. When I say high and dry I'm talking about a vehicle that cranks around, but will not fire up. Touch the probe of the test light to the module terminal labeled "G". ) DIAGNOSING HEI COMPONENTS Photo 8. Mounting holes in the module body must be connected to engine/chassis ground (battery negative (-) post). HEI uses no ballast resistor or resistance wire. Went out and bought new ignition module for hei distributor(no luck)then bought the part. (cranking buddy not shown—see "Victoria's Secret" catalog models for suggestions for a helper. The MSD module is a capacitor discharge module, and gives you a longer and hotter spark than the HEI. Ive made sure all wires are in good shape. If the battery is fine, make sure the wire feeding the distributor is sufficient. I have a 4 pin module in my HEI distributor. The signal wire runs from the ignition control module to the ignition coil. This diode snubs of the peak voltage to 350V (otherwise it is around about 450V which is a threat to the Darlington output transistor in the module):. My problem is for whatever reason the coil will only fire for the first couple revolutions of cranking and then quit. As a preview, Here is a little teaser video showing my conversion avail direct, using the optional round HEI coil. (The test light will not light up on this test. I'm using an 81 DS2 dizzy and tried using an HEI ignotion module. I have an 86 f150 that I've taken the feedback carb and TFI dizzy out of. When you pull the probe OFF the terminal, you should hear a snap (the spark) from the coil. You should have battery voltage w/ the key in the start and RUN positions. Now, AutoZone can test it for you (if you remove it and take it to them), but for those of you that can't afford the time this involves or for those who want to add another diagnostic technique to their ‘toolbox’ of know-how, this article is for you. If it's wired like points it will work on 9 volts but has problems being consistent especially at higher RPMs. module type AB14. The Stock GM HEI System Is a well engineered system for most street hod-rodding applications. I checked it with an inline spark. ) DIAGNOSING HEI COMPONENTS Photo 8. Please help this bodyman test the system to know which component is bad. Touch the probe of the test light to the smaller terminal of the module--it's labeled "G" and had the Green pickup coil wire connected to it. Connect the ground side of your test lamp to the battery POSITIVE cable. 350 Chevy won't start!!!! Is there a way to test the coil and module to see which one needs replaced? I have 12-Volt at the Battery wire going to the distributor but she won't start!!!! I put one of those cross-fire caps/coils (puts 4-wires on each side) that makes a neat wire job on a show car about 3 years ago. You should have battery voltage w/ the key in the start and RUN positions. Yes I used a computer part on a truck. The points and performance HEI were more evenly matched throughout the tests. I have an 86 f150 that I've taken the feedback carb and TFI dizzy out of. Solid Brass Terminals: Motovecor brand provides high-quality manufacture and solid base design for adapting perfectly to the ignition module. I initially installed one and later on stepped up to the MSD 6530 programmable ignition which is awesome, imo. If this has the GM HEI module, a high speed miss is not uncommon, it's just on it's upper limit. Connect the positive test light lead to the ignition module signal wire. If the light flickers when the ignition is cranked, you will need to check other components for a solution to. I did the HEI conversion. Fits All GM Applications 73 to 89. The ignition system has two wires attached to the switch’s run terminal. They break. It uses an ignition module within the distributor to regulate the timing curve as well. The original equipment GM ignition control module can go a long way before it leaves you high and dry. One is the "resistance" power wire. The entire HEI system (except for the ignition coil on fuel injected engines) is contained within the distributor cap. Your ECU should have a location where to set this offset, and once this is set, this location will become the new zero. Orange and black going to C+ & B+ on the HEI coil, and the middle pin on the HEI is grounded. I have a 1986 Chevy c/10 with the 305/5. How To Test Ignition Switch: The Procedure. When you pull the probe OFF the terminal, you should hear a snap (the spark) from the coil. The ignition coil fires when the module shuts off voltage to the coil primary. 2 out of 5 stars. From the results you get, you'll be able to pinpoint the problem to the ignition. It uses GM’s HEI module, with an additional 1uF filter capacitor on its 12V supply feed and a power zener diode on the HEI’s coil connection. Connect the alligator clip of your test light to Battery + (maybe the alternator + terminal is closer) Touch the probe to any ground, the light should come on nice 'n' bright. This is akin to the breakers opening. HEI Modules: 1. Duraspark conversion video. 5 out of 5 stars 7. 4L GM equipped vehicle (see the Applies To box on the second column). You should have battery voltage w/ the key in the start and RUN positions. Last edited by resdoggie; 10-23-2021 at 10:24 AM. Now, AutoZone can test it for you (if you remove it and take it to them), but for those of you that can't afford the time this involves or for those who want to add another diagnostic technique to their ‘toolbox’ of know-how, this article is for you. Here is the DS distributor running a GM 4 wire ignition module. I found that the positve wire that i ran from the fuse block would make the speakers cut out qhen juat the outside got close to the speaker wires. Easy tests for HEI system: 1. This forum is great for the rest of it. Model coverage includes all makes and models of GM vehicles including passenger cars, trucks and vans. Most of the original modules installed in Chevrolet distributors from the mid-80s through the mid-90s shared the same solid-state design. This method can be used to start an engine that has some sort of after market digital fuel injection system as well. 5, check your battery. The other is a wire that supplies power from the starter solenoid "R" terminal, it supplies power only when. The original equipment GM ignition control module can go a long way before it leaves you high and dry. Direct Replacement for Factory Unit. When you pull the probe OFF the terminal, you should hear a snap (the spark) from the coil. Here is the DS distributor running a GM 4 wire ignition module. Last edited by resdoggie; 10-23-2021 at 10:24 AM. If the light flickers when the ignition is cranked, you will need to check other components for a solution to. Test for power at the pink BAT terminal. Check out the MSD HEI upgrade kit (or just buy the MSD HEI coil). Heres my problem: I was driving along and I lost all power in the cab of the truck, the head lights worked but nothing else. Saturation Time Checking Gm Hei Module Dwell Farm Machinery Digest. Connect the ground side of your test lamp to the battery POSITIVE cable. The ignition coil fires when the module shuts off voltage to the coil primary. Get it Wed, Oct 27 - Mon, Nov 1. HEI is characterized by the incorporation of the ignition coil into the distributor cap for most applications. I checked under the hood and noticed that the fusible link had come off the junction block under the hood, fixed. At idle on a V-8, the dwell with a Delco module should be between 10 and 15 degrees. One is the "resistance" power wire. I replaced the module in the distributor. A cold module will usually start working OK again for a short while. 2 out of 5 stars. Easy tests for HEI system: 1. (I always keep a spare just in case). From the results you get, you'll be able to pinpoint the problem to the ignition. I kept the coil from the upgrade kit and it doesn't skip a beat to 6200+ rpm. The stock HEI didn't score its first horsepower win until the 4600-5000 range, and was exactly even 3 times in the 6100-6500 range. Now you get modern electronics (same as the $$$ HEI Distr has) that are available in every parts store. HEI is characterized by the incorporation of the ignition coil into the distributor cap for most applications. Last edited by resdoggie; 10-23-2021 at 10:24 AM. HEI style preferred but not abso-lutely required. Control Module. Pertronix D72000 Flame-Thrower HEI III 4 Pin Ignition Module (GM) 4. It is recommended to set a 10 degree advance offset for the Chevy HEI 8-pin system. org is great for info on my engine. Good bye lean{lame**burn. The ignition system has two wires attached to the switch’s run terminal. He did complain about the GM HEI switching modules though. Ive made sure all wires are in good shape. All hype aside if you combo is well under 12:1 compression ratio and or rarely sees continuous heavy load 5,000 RPM duty you have nothing to gain from other. GM HEI control modules it was designed to use the 4 pin module to begin with. Check the dwell on an HEI module to confirm the circuit is evoking the longer (expanding) dwell time as the engine speed is increased. Thanks so I have concluded that my truck has been converted to the HEI and thus doesnt have a electronic spark control module, I bought a new cap, rotor, button, ignition coil, and ignition control module, took it for a test drive, it died put the old rotor, and ignition control module back on she runs again. In all, the stock HEI produced more horsepower than the points in a mere 6 out of 36 tests. The ignition coil fires when the module shuts off voltage to the coil primary. The ignition system has two wires attached to the switch’s run terminal. I replaced the module in the distributor. Good bye lean{lame**burn. One is the "resistance" power wire. Went out and bought new ignition module for hei distributor(no luck)then bought the part. A cold module will usually start working OK again for a short while. I found that the positve wire that i ran from the fuse block would make the speakers cut out qhen juat the outside got close to the speaker wires. If the voltage drops below 10. If the light flickers when the ignition is cranked, you will need to check other components for a solution to. JDMSPEED New Ignition Module GM HEI 4 Pin D1906HT LX301 Replacement For Buick Chevy Pontiac Old 1974-1988. You will notice a wire harness on the side of the module; the signal wire is the middle wire of the three. From the results you get, you'll be able to pinpoint the problem to the ignition. The other is a wire that supplies power from the starter solenoid "R" terminal, it supplies power only when. 5 out of 5 stars 7. To do this, connect a tune-up tach and dwell meter to the "TACH" terminal on the distributor cap and then start the engine. Installed an hei dizzy into my 73 pickup and now my speakers cut in and out. Touch the probe of the test light to the smaller terminal of the module--it's labeled "G" and had the Green pickup coil wire connected to it. One is the "resistance" power wire. With the V2. Battery voltage at both the ignition coil and ignition control module. Although this case study involves a 2000 Chevy Monte Carlo (with a 3. 350 Chevy won't start!!!! Is there a way to test the coil and module to see which one needs replaced? I have 12-Volt at the Battery wire going to the distributor but she won't start!!!! I put one of those cross-fire caps/coils (puts 4-wires on each side) that makes a neat wire job on a show car about 3 years ago. General motors 7 pin hei ignition control module wiring diagram wire diode fix holley motor mopar gm chevy distributor conversion intermittent start 3 coil or msd team chevelle rebuilding ignitions of for an 8 your 216 235 261 checking dwell 4 installing new system 6 cylinder to external xr crf80 200 electronic dual connector. How do you test an ignition control module in GM? Step 1 : Check your ICM for current. I'm using an 81 DS2 dizzy and tried using an HEI ignotion module. The HEI just uses 12 volts. 0L engines, is a pulse-triggered, transistorized controlled, inductive discharge ignition system. You will notice a wire harness on the side of the module; the signal wire is the middle wire of the three. It uses an ignition module within the distributor to regulate the timing curve as well. I love to cross apply parts. David Vizard did some testing on the old-style V8 HEI mechanical advance distributors, and in Chevy Small Blocks on a Budget reported no problems with the magnetic pickups out past 6000 rpm. Yes I used a computer part on a truck. JDMSPEED New Ignition Module GM HEI 4 Pin D1906HT LX301 Replacement For Buick Chevy Pontiac Old 1974-1988. As a preview, Here is a little teaser video showing my conversion avail direct, using the optional round HEI coil. (I always keep a spare just in case). (Its the smaller of the two terminals that you disconnected the pickup coil wires from), and it’s the one that had the green wire on it. The system consists of a control module and a magnetic pickup mounted in the distributor. Mounting holes in the module body must be connected to engine/chassis ground (battery negative (-) post). Please help this bodyman test the system to know which component is bad. As mentioned previously, you will also need to be sure that the electricity from the module is getting to the spark plugs as well. This diode snubs of the peak voltage to 350V (otherwise it is around about 450V which is a threat to the Darlington output transistor in the module):. Ive made sure all wires are in good shape. 1 cylinder location and the rpm of the engine. To make sure it is not the hot wire, run a temporary jumper wire directly from the positive side of the battery to the distributor. Get it as soon as Tue, Aug 17. General Motors 1976908. I have a 1986 Chevy c/10 with the 305/5. Your ECU should have a location where to set this offset, and once this is set, this location will become the new zero. 4L GM equipped vehicle (see the Applies To box on the second column). The distributor, in addition to housing the mechanical and vacuum advance mechanisms. The info from this thread Bypass Toyota Ignition and Coil I used the parts listed in the thread Ignition Module from a 1979 GM truck with a 350 CI engine Autozone P/N DR100. If it's wired like points it will work on 9 volts but has problems being consistent especially at higher RPMs. 2 out of 5 stars. 1 cylinder location and the rpm of the engine. On newer engines, the Crank Shaft Position Sensor performs this function. Motovecor HEI Distributor for Chevy gives 4-pin ignition module with a direct fit option for fast and easy set-up. The HEI just uses 12 volts. I did the HEI conversion. The typical ignition system circuit diagram for the 1992-1995 4. So now I need to inspect the coil, and the wires which feed it and the module. Mounting holes in the module body must be connected to engine/chassis ground (battery negative (-) post). The tools you need to diagnose an HEI that has a 4-terminal module. The HEI system, used on 2. One is the "resistance" power wire. HEI Distributor. I replaced the module in the distributor. Thanks so I have concluded that my truck has been converted to the HEI and thus doesnt have a electronic spark control module, I bought a new cap, rotor, button, ignition coil, and ignition control module, took it for a test drive, it died put the old rotor, and ignition control module back on she runs again. Fits All V8, V6, and 4 Cylinder HEI Distributors. The downside to this test is that if you already have a carbon track in the cap, you may have a perfectly good module, ignition coil, and pickup coil, but still have a non-running engine. GM Tech 2: This is the GM factory scan tool used in all GM dealers since 1996. Yes I used a computer part on a truck. To solve that i ran a relay so now i just have a signal wire inside the cab. The ignition coil fires when the module shuts off voltage to the coil primary. The purpose of the HEI install was to fix a sudden engine cut-out problem and a. Rather, the problem would be a crank, no-start condition. 2 main board, you can use a GM 7 or 8-pin HEI module to convert the signal AND control the coil. HEI Modules: 1. The Engine Control Module uses the distributor reference pulse to calculate the engine speed. If you need to test the 7 pin (older) ignition module, the following tutorial will help: How To Test The Ignition Control Module (2. (cranking buddy not shown—see "Victoria's Secret" catalog models for suggestions for a helper. GM Tech 2: This is the GM factory scan tool used in all GM dealers since 1996. Features: HEI Style. It uses GM’s HEI module, with an additional 1uF filter capacitor on its 12V supply feed and a power zener diode on the HEI’s coil connection. Thanks so I have concluded that my truck has been converted to the HEI and thus doesnt have a electronic spark control module, I bought a new cap, rotor, button, ignition coil, and ignition control module, took it for a test drive, it died put the old rotor, and ignition control module back on she runs again. He did complain about the GM HEI switching modules though. Get it Wed, Oct 27 - Mon, Nov 1. Hit the distributor housing with a full-hot blast from the heat gun to stress the module, and if it dies or misses, hit it with a squirt of liquid refrigerant for a quick cool-down. HEI 8-Pin Module. Step 3 - Check Spark Plug Current. Clip the negative test light lead to a solid ground such as negative battery terminal. General motors 7 pin hei ignition control module wiring diagram wire diode fix holley motor mopar gm chevy distributor conversion intermittent start 3 coil or msd team chevelle rebuilding ignitions of for an 8 your 216 235 261 checking dwell 4 installing new system 6 cylinder to external xr crf80 200 electronic dual connector. If it's wired like points it will work on 9 volts but has problems being consistent especially at higher RPMs. Easy tests for HEI system: 1. (The test light will not light up on this test. This forum is great for the rest of it. If this has the GM HEI module, a high speed miss is not uncommon, it's just on it's upper limit. Also, it has a good aluminum body for adjusting perfectly for simple usage. Anyway- HEI is really easy to diagnose, with a basic test light. Went out and bought new ignition module for hei distributor(no luck)then bought the part. Still no spark. Most of the original modules installed in Chevrolet distributors from the mid-80s through the mid-90s shared the same solid-state design. 2 main board, you can use a GM 7 or 8-pin HEI module to convert the signal AND control the coil. Thanks so I have concluded that my truck has been converted to the HEI and thus doesnt have a electronic spark control module, I bought a new cap, rotor, button, ignition coil, and ignition control module, took it for a test drive, it died put the old rotor, and ignition control module back on she runs again. The original equipment GM ignition control module can go a long way before it leaves you high and dry. Model year coverage is from 1992 to 2013. Next, we'll verify that the ignition control module (ICM) is receiving the signal from the pick up coil. Anyway- HEI is really easy to diagnose, with a basic test light. ACCEL 35362 High Performance Ignition Module for GM Remote Mount Coil HEI. I initially installed one and later on stepped up to the MSD 6530 programmable ignition which is awesome, imo. The purpose of the HEI install was to fix a sudden engine cut-out problem and a. That's when we jumped head first into showing you what goes into diagnosing your HEI distributor with help from Performance Distributors when we published, HEI Distributor. My problem is for whatever reason the coil will only fire for the first couple revolutions of cranking and then quit. Touch the probe of the test light to the smaller terminal of the module--it's labeled "G" and had the Green pickup coil wire connected to it. I kept the coil from the upgrade kit and it doesn't skip a beat to 6200+ rpm. Today, there are several aftermarket high- performance modules and coils that can be added to a stock GM HEI distributor to give it excellent spark energy and rpm potential up to 7,000 rpm. Hi , back again with a little more detail on my problem, have a buick 66 with a 350 chevy engine in it, started it up a week ago and it ran fine, this week i tried to start it and it cranks but no spark. I used a P4 intel heat sink on it. Test for power at the pink BAT terminal. Mounting holes in the module body must be connected to engine/chassis ground (battery negative (-) post). Just so, how do I check my GM HEI module? Turn the ignition ON. It uses GM’s HEI module, with an additional 1uF filter capacitor on its 12V supply feed and a power zener diode on the HEI’s coil connection. HEI style preferred but not abso-lutely required. This would be a significant upgrade, IMO. based on the GM HEI module will allow you to get a replacement module nearly anywhere! Notes on wiring for a "points" distributor; There are normally two wires on the "+" terminal on the coil.