dangerous bonneville - 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 08-12-2009, 07:51 PM   #1
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I have a 97 bonneville that will just die going down the road. It does die when you stop somtimes so it really dies whenever. It also seems to be losing mpgs. Any ideas?
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Old 08-12-2009, 07:54 PM   #2
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Does it start back up? Is it like you shut it off or does it stutter a bit then die. Need a bit more info.
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Old 08-12-2009, 08:23 PM   #3
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It will just die with no warning. Like it just shuts off. When you go back to start it the starter drags a little bit but it always starts back.
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Old 08-12-2009, 09:01 PM   #4
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Start by checking both battery cables on both ends. They tend to get corroded and can cut out. A loose connection can do this as well.
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Old 08-12-2009, 11:57 PM   #5
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I had the same problem with my 94 Bonnie would just be driving down the street and wham she shuts off like you turned the keys off no warning. I got my crank sensor and my O2 sensor replaced and so far no stalls and no weird running so far its been a week now so look into those areas. That might just be your problem. Good luck and let us know. My tech guy said what happens is the crank sensor that'* going bad would get to hot and then it would not signal the pcm for spark into the motor and therefore the car would should off is what he said. I replaced it so far and no more shut offs yet.... I know this is scary because I was cruising down the hwy at 60 mph and she just quit yikes. Next morning I got a new Crank and O2 and so far its helped out alot.
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Old 08-13-2009, 04:16 PM   #6
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That would make sense why my gas mileage has gone down too. I appreciate the input. Let you know how it goes.
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