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Old 10-07-2010, 02:25 PM   #31
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You need to check for spark when it'* not starting.
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Old 10-07-2010, 02:40 PM   #32
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How do I test that?
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Old 10-07-2010, 08:54 PM   #33
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I checked the fuel pressure and it seems fine. I'm also getting spark when its hot. My neighbor seems to think its the o2 sensor. Would that throw a code? Its the one of the back of the engine behind everything; kind of close to the back spark plugs? Oh I checked the vacuum like and it seems ok too. Any more ideas? I am about to pull my hair out! I didn't think this would be this hard. :(
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Old 10-07-2010, 09:01 PM   #34
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I don't see the O2 sensor causing a sputter. Weak spark causes a sputter. And 9 times out of 10 that'* bad coils. Do you have stock coils in this car or a after market?
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Old 10-07-2010, 09:28 PM   #35
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You're right! I just checked it again when it was hot and I am not getting a spark. Before I was getting a spark but maybe it wasn't quite warm or something. I checked all the coils and replaced one. I think they are ok. Maybe I should check them again? Two are aftermarket and I think one is still original. If its not the coils then whats left, the ICM?
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Old 10-07-2010, 09:35 PM   #36
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If it'* still causing problems when hot, then you haven't found the bad coil. I've seen several work fine cold, then fail hot. And that'* what it sounds like is happening with you. Did you say you changed one coil already? If so, use that coil you took off and swap a different coil and see if it corrects the problem.

Because you have now determined you don't have spark you can forget everything else and concentrate on the ignition system. Your options are, bad coil, bad ICM, there are other things but they tend to be all the time, not just when hot.

May not be a bad idea to remove all the coils, lift up the ICM, and clean everything up. A little corrosion can cause a lot of problems.
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Old 11-11-2010, 12:12 PM   #37
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I sure would like to hear the out come of this problem! The internet is saturated with it on GM cars. My 95 olds has been down for a month, very simular to yours!

I would like to know if there is a way to test and see if a quad driver is shuting down (computer protection)at a point where engine temp is reached, and some action called for by the computer , trips a shutdown , causing a stumble or no start condition.

I dont like throwing parts at it either.

Hope you find it.
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Old 11-11-2010, 01:20 PM   #38
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Hey guys,

I'm really glad I got a reply because it reminded me that I needed to let everyone know that I did get it fixed. Danthurs was right on.

It was the icm. Apparently, when the engine got hot the icm would spaz out. I didn't want to spend all the money on a new one since the car is getting pretty old. So I went to the junk yard and got a icm off of a grad prix; came with coils and all. I swapped the whole unit out and it has been running like a champ ever since. Also, I think there is a leak in the lower intake manifold but I'm not sure I'm going to mess with it since we are probably going to trade it in.

Anyway, thanks again for everyones' help!!!!
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Old 11-11-2010, 02:43 PM   #39
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Thats good to hear!!!!!!!!!!!!!!!!!!!

I had my ICM tested a o'riles auto parts and it was good might try that again but heat it up with a hair dryer first. Also have another one from junk yard that I have on there now, but no change.
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Old 11-11-2010, 03:41 PM   #40
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Bummer. I would let the car heat up and check for spark. That would let you know if it is ignition related or otherwise. Hope that helps; worked for me. Good luck!
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2000 bonneville, cam sensor error, sputters, tach drops, warm

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