Question about 1999 Chevrolet Blazer
A bad injector, piston ring blowby or a head gasket/coolant problem can also cause a cylinder to misfire.
Compare the color of that plug to one from another cylinder. If it is wet and gassy you have too much gas or not enough spark. If it is black and oily you have a piston ring problem. If it is sweet smelling, watery wet or white foamy you have a head or head gasket problem, if it is white then you have a too lean condition (plugged or faulty fuel injector).
Posted on Jan 01, 2011
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Posted on Jan 02, 2017
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