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PostPosted: Thu Dec 19, 2013 5:42 pm 
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Joined: Sun Apr 01, 2012 10:22 pm
Posts: 13
Year and Trim: 1991 Bonneville LE
1991 LE 145,000 new coil /ignition module/ plugs/wires/replaced water pump. no trouble codes stored in ecm. When car is cold starts right up and runs great. After 10-12 min the rpms become erratic and engine stalls and won't restart until temp falls off. Passed smog check last week and I can't figure it out.

Any help or suggestions would be appreciated[/color]


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PostPosted: Thu Dec 19, 2013 8:12 pm 
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Certified Bonneville Nut
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Joined: Tue May 27, 2008 8:53 am
Posts: 5336
Location: Las Cruces, NM
Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
My first thought is the crank position sensor. Symptoms fit perfectly. The icm could be bad too, unless it did this with the old one too

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1993 Buick Park Avenue - 197k - Some odds and ends done - Simply won't die
1994 Buick Regal - 78k - Bone stock - Always ready for a good kicking
1990 Oldsmobile 88 - Gone to a better place


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PostPosted: Sat Dec 21, 2013 4:11 am 
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Posts like an L36
Posts like an L36

Joined: Wed May 02, 2012 3:29 pm
Posts: 999
Location: Lincoln, NE
Year and Trim: 1988 LE
2000 SSEi
I would also say possible crank sensor, but the icm could be a likely culprit as well. I have learned the magnavox design overheats easily and will cause shorts within the bow causing exactly what you mention. Try changing to a newer ac delco 3 coil pack from a series 1 3800

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1988 LE, Intercooled L67 loading......

2000 SSEi R.I.P. Dead now :( INTENSE FWI, polished LIM, P&P supercharger, custom radiator, standalone trans cooler, trans-go shift kit (donating to the 88)

2002 2500HD Silverado with the 8.1 Vortec and Alison tranny. Likes to eat GT Mustangs and lots of tires, and all while stock!


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