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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / June 200591 olds performance problem
I have a 91 olds 3.1 Get very little response when trying to accelerate under load. Gas mileage is down considerably. In neutral (hot or cold), engine sounds fine until 4000 rpm, then it shudders, fluctuating quickly between 3500 and 4000 rpm, and will not go above 4000 rpm. I have: replaced spark plugs and wires replaced fuel filter replaced O2 sensor cleaned the EGR valve checked fuel pressure checked back pressure checked vacuum checked for codes (none set) Any help appreciated. First of all you cannot rev above 4k in neutral for obvious engine issues, pcm stops this. How is the power/acceleration above say 25-30mph? >I have a 91 olds 3.1 > [quoted text clipped - 18 lines] > > Any help appreciated. Thanks for the info about the rev limiter, that was a big help. It got me to try another test I read about here. I removed the O2 sensor and drove around. Got a noticable improvement in performance. Now I will replace the catalytic converter and muffler. - Jeff Thanks for the info about the rev limiter, that was a big help. It got me to try another test I read about here. I removed the O2 sensor and drove around. Got a noticable improvement in performance. Now I will replace the catalytic converter and muffler. - Jeff
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