Mechanics

HEAD GASKET

1997 Cadillac Concours

Engine Performance problem
1997 Cadillac Concours V8 Front Wheel Drive Automatic 63,000 miles

can a defective head gasket cause a cylinder to run lean and miss with out showing any other signs of a leak
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Lenvette
August 7, 2009.



It can definately cause it to miss, as the coolant doesn't burn. It would create more unburned fuel in the system, that may cause it to indicate rich. The coolant is also capable of contaminating the O2 sensor.

Factoryjack
Aug 7, 2009.


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