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Pontiac Forum: Yet another misfire question, but not random misfire
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Old December 10th, 2017, 08:42 PM
btah btah is offline
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Not sure why anyone would go that route on a 2002 grand am unless you have the equipment to do it yourself. That is more than the car is worth.

Regardless, I am where I am. #1 with 110 compression is not great, but should be driveable. #4 with 160 to 170 is as good as the factory. The other two cylinders I tested were all in the 160 range.

But, that compression, at least I think, isn't going to cause completely dead cylinders. I hurt something when checking for spark at the coil packs. Just not sure what that could have been unless both my ignition control modules are bad. Maybe that is a common way they fail???

I took the ICM I have sitting on the bench and was just playing around with checking resistance. I found that the spades (that the coil packs plug in to) show no resistance between the #1, #6, and #2 spade. That seemed odd to me but for no particular reason other than it seemed odd that there would be a path between all those spades at the same time. Unless that is what it is in its resting state with no power. It would seem that if you power one of the spades it is going to fire all three, but that might just be my misunderstanding of how they work. There was no path between the other spades (i.e. #4, #5, and #3).
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Old December 11th, 2017, 12:56 PM
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melsg5 melsg5 is online now
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do you have a check engine light on and if so what are the codes. Autozone and other parts stores will check codes if you do not have a scanner.
you state plugs in #1 and #4 are oil fouled thus they misfire.
the link below discusses testing the ICM and coil packs
1971 GTO 455 HO Ram Air
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Old February 4th, 2018, 12:01 AM
btah btah is offline
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Just to finish off this thread. I ended up completely losing compression in #1. The motor has taken its rightful place at the junkyard along with the many other wonderful GM products. No wonder they had to be bailed out. What horrible products. I've owned 4 GM products, all were horrible. That is why used ones are so cheap compared to something decent.

Off the soapbox now.

Thanks for the replies.
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