Dies at stop signs, seems low on power - 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 03-21-2010, 07:06 PM   #1
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Default Dies at stop signs, seems low on power

I have a 1994 Bonneville that sat over the winter. When I parked it, it had plenty of power and ran perfectly fine. It seems like it'* low on power, when you stand on the gas it won't jump into passing gear. It also dies every once in a while when you get off the gas while your approaching stop signs or stop lights. It always starts right up and you can go on. I also notice while sitting in my driveway over the weekend that the idle throttled up to 3,000 rpms for a few seconds and then came back down. It seems to run fine once you get going down the highway.

Any ideas without me having to take it to a mechanic?
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Old 03-21-2010, 07:14 PM   #2
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I'm thinking it'* either your TPS(Throttle Position Sensor) or your MAF sensor(Mass Air Flow)
Do you have a multimeter?
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Old 03-21-2010, 09:09 PM   #3
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Clean the MAF, inspect and test the coils, change the plugs, check the plug wires.
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Old 03-21-2010, 09:30 PM   #4
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Do these cars have Idle Air Bypass valves? This was a common problem on Ford'* 4.6'*.
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Old 03-21-2010, 09:39 PM   #5
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MAF was the problem on my 97. This also threw the SES light too
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Old 03-22-2010, 08:40 AM   #6
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At a stoplight, the pcm will be controlling idle through the IAC based on MAF readings etc. While you are cleaning the MAF, clean the IAC as well and check the throttle plate/linkage for free movement.

You might check the air filter as well to ensure no critters piled nuts in there that might restrict airflow.
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Old 03-23-2010, 06:26 AM   #7
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If it sat for a while it could be the gas try a new fuel filter and fresh tank of gas.
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