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1994 Chevy Cavalier running rough

Tiny
2CP-ARCHIVES
  • MEMBER
  • 1994 CHEVROLET CAVALIER
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 65,250 MILES
1994 Chevy Cavalier mileage: 65,250. The car suddenly started running rough and noisy with what sounds like backfiring through the intake manifold on acceleration. Replaced plugs and plug wires, fuel filter, air filter and PVC valve. This made no difference. I added fuel injector cleaner to the tank and took it out on the road for a long drive at highway speed and the problem only got worse. One point of note was that five plugs were normal and the cylinder on the back driver's side was covered with black soot. Any ideas?
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Friday, November 19th, 2010 AT 11:36 PM

1 Reply

Tiny
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  • MEMBER
  • 4,542 POSTS
The symptoms you mentioned point to a valve train problem. Check the valve springs and rocker-arm assembly especially the cylinder with the spark plug with the black soot. Also, check for a flat cam on that same cylinder.
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Friday, November 19th, 2010 AT 11:38 PM

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