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1991 Chevy Caprice Car won't accelerate !

Tiny
MACTOWN96
  • MEMBER
  • 1991 CHEVROLET CAPRICE
  • V8
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
I have a 91 Chevy Caprice 145000 miles. Whenever I get on the freeway and mash the gas the speed won't go pass 60 mph it losses power and it starts to lose speed. I take my foot off the gas and mash slowly, it starts to pick up speed once again. The check engine light comes on for a second and cuts back off, changed fuel filter and put fuel injector cleaner in the gas tank, still the same results.
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Sunday, April 4th, 2010 AT 12:26 PM

1 Reply

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Next thing to perform would be an exhaust backpressure check. You can do this with a gauge in one of the O2 sensor ports. Another way to rule out plugged exhaust is to either remove the oxygen sensor(s) and drive it, or disconnect the exhaust pre-cat and drive it. It is going to be loud, and make sure the hot exhaust is not exiting on something that could be compromised.
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Tuesday, April 6th, 2010 AT 10:43 AM

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