1993 CHEVROLET

  • Tiny
  • walt sisne
  • 1993 Chevrolet

Engine Performance problem
1993 Other Chevrolet Models 6 cyl Two Wheel Drive Automatic

runs good when engine light is on but when light is off runs poorly and is also using alot of gas also has a little knocking sound

Friday, June 4th, 2010 AT 12:04 PM

1 Answer

  • Tiny
  • hmac300
  • Expert
  • 42,944 posts

If the service light is on you are in open loop and have a sensor not working. That's why you aren' tgetting good fuel mileage. Get it checked out.

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Friday, June 4th, 2010 AT 7:35 PM

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