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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 08-15-2010, 02:10 AM   #1
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Default possessed 93 bonneville

My sons bonneville stalls after it runs for a while. I have replaced the cam sensor, found a lose ground on the fuel pump. these thing seemed to help some but it still does it.I have noticed that when it does it the voltage drops to around 12 volts. tonight I was cleaning the ground connections under the alternator. when I put it back together I had a good strong 14 volts but the alternator started getting real hot and the voltage started dropping. this is a new alternator less than a week old. I did noticed that the belt seems a little tight but I don't see any way to release some pressure from the Tensioner Pulley. I don't know if it has anything to do with the car dieing but the ABS system causes the tac and speedometer to jump around I have pulled the fuse to the ABS and it doesnt do it anymore.I tried to disconnect the unit but the car wont start with it unplugged. Anyone got any ideas where to look now I'm lost.
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Old 08-15-2010, 02:01 PM   #2
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Could be a bad crank senor mine went bad and my car would just stall out when ever it got hot then it would fire back up after it cooled down. I got a new one put in and have been problem free no more stalls. Good luck and let us know what you find out.
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Old 08-16-2010, 01:50 AM   #3
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Also you might want to look into this
https://www.gmforum.com/showthread.php?t=278980
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Old 08-16-2010, 11:01 PM   #4
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Thanx trixster68 good information I'll try that. I did'nt think to look for a ground bus there.
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Old 08-17-2010, 03:11 PM   #5
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When mine did that, it was a coolant leak onto the crank sensor. The cam and crank info gets out of sync and the ECM shuts it all off. YMMV
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Old 08-17-2010, 04:42 PM   #6
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I had a Buick that would randomly stall out. Was at completely random intervals though- sometimes it would run 5 minutes, other times 35 minutes. Was the MAF sensor. Expensive bugger, but it fixed the problem after I tried everything else I could think of (crank sensor, TPS, maybe other things I can't remember). Just my $.02
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