GAH! Broke down..Cranks but no start. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-26-2008, 12:38 AM   #11
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That was before all the grounds were cleaned up.

As I said, I know it'* a ICM problem, no spark whatsoever, my Dad even held the sparkplug against a ground, and didn't even give a weak spark off. :(
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Old 04-26-2008, 02:34 PM   #12
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Hmm... well now I am clueless...

I am not sure how accurate the Wells ignition system tester is at AutoZone, but they tested it 5 times in a row, and passed everytime. SIGH....

I guess I am going out there to check the fuses again, and see if I am getting 12v at the pink wire.
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Old 04-26-2008, 02:43 PM   #13
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Hmmm......either the harness got pinched, or you lost ground to the ICM. Check to see if you get good ground from the ICM mount. I would also wirebrush it just to clean off some corrosion from it, and coat it with dilectric grease.

And though the fuse associated with it may be good, that doesn't mean the terminals AT the fuse is good. Take the fuse out, and see if you measure battery voltage at one terminal, and continuity with the other terminal and the 12 volt pin at the ICM.
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Old 04-26-2008, 03:29 PM   #14
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I just went through dumping a bucket of parts for multiple symptoms. In reality, a bunch of it could be blamed on crapped out connectors in the powertrain control circuits.
One similar problem to yours, was caused by the large (black) 32 pin connector on the PCM (computer). It was a wallowed out female pin. I drove for weeks with the PCM laying on the floor so I could unplug/replug the connector or even just jiggle it; until I figured out how to find the loose pin and fix it. So don't rule out connections between the ICM, and PCM, which also are fed through the 8-way connector, physically near the #2 injector. Sometimes, just unplugging and replugging will TEMPORARILY fix the issue. Oh, on the other question of white grease on the back of the ICM. No, I have never seen any that use it... at least not from the factory.
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Old 04-26-2008, 03:38 PM   #15
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The thing with the grease on the ICM.... I don't know why this has crossed to the 3800 as this is not the case... I have never seen a 3800 use the grease either..

But.... This is done on the Quad 4 Ignition control module and then the Module is bolted to the Cover plate...

But never heard of or seen this on a 3800

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Old 04-26-2008, 04:29 PM   #16
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Ok, checked the pink wire going to the ICM, and it has 12.10 volts.

All the PCM connections are good and solid.

Grounds are clean and are not broken.
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Old 04-26-2008, 04:44 PM   #17
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I'm assuming you already checked the connection at the crank sensor.
Also assuming you checked for spark at more than one coil.

Try unplugging the cam sensor & see if it starts.
I'm 99.9 % sure that the ICM on 92s ground through the ICM mounting bracket. Remove the ICM & mounting plate from the mounting bracket. Clean the top of mounting bracket, both sides of mounting plate & bottom of ICM. I coat all 4 surfaces with a light coat of dielectric grease to help prevent the corrosion from coming back.

If it still won't start your back to the crank sensor or the ICM wiring harness.

Oh yeah - also assuming you have a good & well charged battery.
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Old 04-26-2008, 08:44 PM   #18
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Out of curiousity, because I thought the early Bonnies would crank but not start but I'm not sure, whats the Security Light doing when you try to start her?
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Old 04-26-2008, 09:15 PM   #19
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First thing you gotta do is remove the ICM connector and look into the sockets. Most of them will be bent back too far. Get a tiny screwdriver in there and get behind them from side to side and bend them forward. Now put the connector on and off a couple of times, apply dielectric grease, then see if you have spark.
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Old 04-29-2008, 11:38 AM   #20
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Did you get this resolved?
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