99 Bonneville Dies while Drive or wont start - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat


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Old 02-02-2017, 03:58 PM   #1
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Default 99 Bonneville Dies while Drive or wont start

I currently have a 99 Bonneville that sometimes will start and run for a while then dies while driving other times wont start at all. Not heat related as even after off over night it might or might not start.
This morning it started drove it and no problems started every time of and on for about 4 hrs then sat for a while started and touched the gas it died now wont start again.
two days ago got the codes one was p0141 and p1107 cleared the codes then and as of now has not sent any other codes.

the Vehicle has a New Crank sensor new Map and MAF.

Does anyone have any ideas thanks in Advance.
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Old 02-02-2017, 06:18 PM   #2
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The next time it does this, check your power windows and power locks. If they miraculously fail the same time your engine dies or won't start, you have a ground buss issue. There is a conduit of wires below the carpet/lower left drivers side right at the left kick panel that contains a common ground buss bar. This corrodes over time in the Northern states like Indiana because of salt. This is a common ground that feeds door locks, windows and the fuel pump.
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Old 02-02-2017, 07:16 PM   #3
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Quote:
Originally Posted by Mike View Post
The next time it does this, check your power windows and power locks. If they miraculously fail the same time your engine dies or won't start, you have a ground buss issue. There is a conduit of wires below the carpet/lower left drivers side right at the left kick panel that contains a common ground buss bar. This corrodes over time in the Northern states like Indiana because of salt. This is a common ground that feeds door locks, windows and the fuel pump.
I thought of that as well even though the power windows work fine no matter what. and pulled it all up someone had "fixed" before all ground where bolted though loops. I replaced with a grounding Block and even ran a direct ground to it.

After several hours I found that the wiring harness to the ICM had play tightened it up and no fire loosened it up and pulled slight pressure up all the fire in the world once letting go it losses its contact and dies and zero fire.

Both parts seem fine so not sure which one to replace first the harness or the ICM.
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Old 02-02-2017, 09:25 PM   #4
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There is a ground wire attached to the bottom side of the ICM bracket.
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Old 02-03-2017, 02:07 PM   #5
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Yep but it was solid and in good shape got both parts here and I plugged in the wire harness before splicing wires it still had play so I replaced the ICM and that removed the play so far its running and starting just like it should.
going to road test later today.
Glad was not looking forward to splicing the new harness in.

Thanks much for you insight and thoughts on this matter.
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