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1996 Chevy Caprice backfire

Tiny
LUKEN315
  • MEMBER
  • 1996 CHEVROLET CAPRICE
  • V8
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
Caprice backfires out exhaust under load and has loss of power. After backfire, car takes off and accelerates intermittently. Set code for o2 sensor slow response but check engine light went off, also set code for random misfire on the highway but went off. I did plugs and wires and cleaned grease off opti spark distrubtor and the car has a lot more power but still has the problems. What can I do to fix my backfiring and unusually slow caprice?
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Tuesday, March 3rd, 2009 AT 11:25 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi:
Have you replaced the O2 sensor? Also, have you checked to see if the catylatic converter is partially plugged? Finally, a common cause of a backfire is a vacuum leak. Check closely for them and make sure the intake gasket isn't leaking.

Joe
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Friday, March 6th, 2009 AT 6:34 PM

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