Still Missing under load - 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 02-25-2003, 11:42 AM   #1
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Default Still Missing under load

Need help! 94 bonni still missing. I have replaced plugs, wires, fuel filter, upper intake gaskets. I have yet to clean TB. Could it be the O2 sensor? Please give me some help Will or DeathRat or anyone else for that matter. THANKS
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Old 02-25-2003, 11:55 AM   #2
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I had a problem with the coil packs...........with the mileage I had, I went ahead and replaced all 3 of mine..........just a suggestion, but it would be worth a shot...
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Old 02-25-2003, 12:07 PM   #3
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Default stop replacing stuff

Ok what you need to do is put the money away and get out your book. Bucking or hesitating is usually a fuel problem. Start by checking fuel pressure. Do the entire test the right way. Make sure that the pressure holds after the engine is shut off also so you know an injector isnt leaking. Connect a good scan tool, not just a code reader but a scan tool. Check the O2 readings, check the TPS readings, check everything else. Something will be out of normal in the readings. Then go back to the book and figure out how that system operates so you can make a good EDUCATED decision on the problem cause.

Stop replacing parts until a diagnosis has been done!!! It would be cheaper to get a good shop with the right tools to diagnose it and then fix it your self than to replace everything that could be wrong!!
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Old 02-25-2003, 12:50 PM   #4
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Good idea on the scan. The O2 can't be your problem (not likely anyway) but scanning it for readings can tell you alot. Whether you're running rich or lean. You need someone to watch this data stream realtime while driving in order to duplicate the problem. Coil packs are easy if you know someone with the same era "H" body. You can just swap them and try theirs.
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Old 02-25-2003, 01:22 PM   #5
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good idea Will a guy down the road has the same year
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