General Motors Hei Ignition Modules The easiest way to test a module on the car is to ensure that the wiring & pickup coil are ok. the module is essentially an amplifier with a built in analog to digital convertor. easy tests for hei system: 1. test for power at the pink bat terminal. you should have battery voltage w the key in the start and run positions. 2. That unit puts out a hefty spark. check the rotor. the metal strip on top of the rotor, that contacts the button from the coil above, just below that rotor metal strip, it will arc a hole through the rotor plastic and sending your spark directly to ground. no55mad, apr 12, 2016. share post #6.
Gm Hei Distributor Module 1. let the engine get cold, so tha the problem is not happening. 2. pull the cap, get a heat gun and heat up the pick up coil. try to heat the pick up coil and not the module. put an omh meter across the pick up coil leads and see if the resitance makes a dramatic change while you heat the coil. 4 vettes is right. easiest way to test is buy a new one. swap it out. if it solves your issue, congrats. then go buy another spare. if it doesn’t solve your issue, ok but now you have a spare, which you should have anyway. ps make sure you use the heat sink compound that comes with the module, or buy some if it doesn’t come with. Assumiing you have no spark, 4 pin hei. i am sure there is a test, but its just as easy to check the other components. 12 v at the b terminal. ohm test the pickup coil and check the windings for broken wire. ohm test the ignition coil for continuity. check your rotor for burn through at the coil tab. if all test good, put a module in it. The tools you need to diagnose an hei that has a 4 terminal module. (cranking buddy not shown—see “victoria’s secret” catalog models for suggestions for a helper.) diagnosing hei components photo 8. spark testers: hei on left, points style or chrys ler electronic on right. hei style preferred but not abso lutely required. photo 9.
How To Connect Tach To Hei Distributor Assumiing you have no spark, 4 pin hei. i am sure there is a test, but its just as easy to check the other components. 12 v at the b terminal. ohm test the pickup coil and check the windings for broken wire. ohm test the ignition coil for continuity. check your rotor for burn through at the coil tab. if all test good, put a module in it. The tools you need to diagnose an hei that has a 4 terminal module. (cranking buddy not shown—see “victoria’s secret” catalog models for suggestions for a helper.) diagnosing hei components photo 8. spark testers: hei on left, points style or chrys ler electronic on right. hei style preferred but not abso lutely required. photo 9. You can also bench test the distributor , attach a positive and a negative to the coil , touch one of the plug wire terminals and give the gear a spin , or use plug wire to housing with gap. to see if fires snap. 19eddy30, apr 13, 2023. share post #11. chryslerfan55 likes this. When discussing a factory stock hei, the module is probably the most misunderstood piece of the puzzle. (from right to left) the four pin module was used on carbureted engines with a traditional vacuum and centrifugal advance. the five pin module was introduced in 1978. it was an early attempt at electronically controlling ignition timing.
Diagram Gm Hei 4 Pin Ignition Module Wiring Diagram Mydiagram Online You can also bench test the distributor , attach a positive and a negative to the coil , touch one of the plug wire terminals and give the gear a spin , or use plug wire to housing with gap. to see if fires snap. 19eddy30, apr 13, 2023. share post #11. chryslerfan55 likes this. When discussing a factory stock hei, the module is probably the most misunderstood piece of the puzzle. (from right to left) the four pin module was used on carbureted engines with a traditional vacuum and centrifugal advance. the five pin module was introduced in 1978. it was an early attempt at electronically controlling ignition timing.
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