GlockLT4

Anyone know how to test an ignition module? Trying to nail down whether mine is working right or not. Not sure if LT1/LT4 are different.

Know how to test a coil too?

bogus

there is a difference in the coil... but I donno about the module.

I don't have the testing procedures here... but, if you do a search on member "Jet-Jock" from last September, he had a thread from hell with ignition related problems. might be a good one to scan.

CFI-EFI

My FSM says to: "Check the ignition module with an approved module tester.". Maybe your later FSM has a procedure for checking your different, (?) later, module. For me, it appears I would be at the mercy of the local parts purveyor to test it for me.

RACE ON!!!

pcolt94

I have heard that auto zone can test the module. I am fighting some ignition problems myself now and have already done the Opti. Testing is good if the module is dead or not functing. But depending on the problem, if it is acting up intermittertly or under temperature the only way to know for sure is to replace it. Thats why I have one on order myself because it misses at idle or under high load. Besides, having a spair is not bad to have one around. You can check resistance on a coil, but thest items can break down under operating conditions. If its running, determing test results is tough. Good luck.

rick lambert

Autozone, have them run it through at least 10 cycles-unless you have the right equipment-which most of us don't, the ignition module is beyond us.I wouldn't replace it until it was tested-$$$$, the picup coil is rather easy to test, but you must wiggle the wires while testing-otherwise the ohms test is kinda worthless.

pcolt94

Your right on the 10 cycles, I have seen that. wiggle wires - always. But I was talking about checking the resistance on the ignition coil (hot coil). I think the 96 has the opti, hot coil and the ICM. I dont think is uses a pick up coil-- am I wrong?

USCG

I think you are right. The hot coil thing is important since there is a heat sink and the dielectric grease procedure, but they are pretty easy to get to, sort of unusual for a Corvette. There was an engineer from KY that posts a lot of interesting articles. He did one on the coil location-on the block and off the block to check whether the temps made any difference. Upshot was that on the block gave a higher temp but was more gradual change. I think in the end it did not make much difference, but most agree that Electronics don't like quick/extreme temp changes.

What this has to do with testing the coil....I don't know. Just sort of threw that in to stir things up.

comp

GlockLT4

Hmmm, interesting. Autozone told me that they couldn't test the module. Guess I'll just go take it and read the manual there to do it myself.