95 bonneville 3.8 stalling - 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 05-08-2007, 12:37 PM   #1
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Default 95 bonneville 3.8 stalling

my 3.8 stalls with no warning. sometimes starts right back up, other times i have to turn it over many times. sometimes when it starts back up there is a little backfire. no trouble codes. mechanic said cam sensor, replaced, no effect. he said it could be icm, or pcm. would be expensive to start slugging in part. when it runs, it is really quick, and starts fast.car has 120,000 miles. help. wife drives it. don`t want her broke down all the time. mostly happens when slowing down, or letting off accelerator. if going around 35 or faster, it starts back up on its own. thanks for any help.
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Old 05-08-2007, 12:39 PM   #2
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Is the check engine light on? If so, have your mechanic pull the codes.

Also, has your mechanic checked the fuel pressure?
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Old 05-08-2007, 12:45 PM   #3
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Default engine light

no. service engine light does not come on. mechanic hooked up. no trouble codes. said it is not a fuel problem
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Old 05-08-2007, 12:56 PM   #4
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Others will chime in, but don't be surprised if a piece of advice is to have him check the fuel pressure.
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Old 05-08-2007, 01:18 PM   #5
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Had same issue and it was the crank position sensor.
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Old 05-08-2007, 01:43 PM   #6
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With symptoms like this, the first thing to go after are the battery cables. Disconnect them from the battery and PULL THE BOOTS OFF. That'* where the trouble hides. You cannot see the corrosion unless you pull the boots. Clean, apply dielectric grease, then do the same for the connections at the starter, alternator, and the 3 grounds under the ICM bracket.

You have classic symptoms.
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Old 05-08-2007, 02:50 PM   #7
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Default things to try

thanks guys, appreciate the info. now have some more things to try. really a good lookin car, runs fantastic. if i can solve this, it will be back where it was. never really had this problem before i changed the fan belt.(i know, i didn`t touch any wires.)some guy said the icm receives the 18x and 3x signals. if one is missing, then this will happen. know the 3x is the crank sensor, don`t know what the 18x signal is though.
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Old 05-08-2007, 07:28 PM   #8
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Just remember in the future to fill in all the details from before the problem existed. I had the problem on my 89 where the serpentine belt broke and took out the crank sensor with it. I think the newer models have a sheild around the sensor, but that doesn't mean it stays on after someone works on them.
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Old 05-09-2007, 09:43 AM   #9
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got it! i banged with my fist on the coil packs with the engine running, and lo and behold, when i hit the third one, the engine died, repeated it several times with same result. took them off, removed icm, cleaned grounding underneath, put back together. no failures at all now. thanks for the input. this sites a real help.
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Old 05-09-2007, 05:21 PM   #10
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its the crank positioning sensor...they stall out then either fire back up or you gotta wait a few let it cool off and she fires back up...i had it go bad in my 99' from what i remember its not a very expensive fix
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