Mechanics

MODELS

1993 Chevrolet Other

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
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Walt sisne
June 4, 2010.



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.

Hmac300
Jun 4, 2010.