engine dies and backfires when press gas too hard... - 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 05-06-2004, 05:12 PM   #1
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Default engine dies and backfires when press gas too hard...

I am frustrated! I have a 96' Bonneville and the engine keeps cutting out when I am driving down the road. In higher RMPs it seems to run fine. In lower RMPs is runs O.K. as long as you don't push the gas too hard. When you are running low RMPs and push the gas to accelerate more than 1mph/sec the motor will kill and then backfire. If I am going 55 down the highway and the car is in overdrive and i step on it the motor will die. It can not downshift because the motor doesn't run up the RPMs to drop it a gear. So I have to manually down shift, accelerate, and then put it in OD. I have replaced the sparkplugs, the wires, cleaned the air/gas sensor, and even took out the honeycomb in my convertor to try to fix it. Any ideas? There are no codes and the check engine light is not on!
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Old 05-06-2004, 05:37 PM   #2
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Air/gas sensor? You mean the oxygen sensor on the exhaust? Is this a naturally aspirated engine (non-supercharged)? My thoughts are MAF sensor or TPS or PCM. I bet there are some codes in there, you just need a scan done.
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Old 05-06-2004, 05:51 PM   #3
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MAF,TPS,PCM?? Sorry I am noob...
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Old 05-06-2004, 05:52 PM   #4
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Mass Air Flow sensor, Throttle Position Sensor, Powertrain Control Module

They are all critical to proper operation.
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Old 05-06-2004, 06:12 PM   #5
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you may have a stuck valve that would cause it to backfire... As for it dying I'm not sure.
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