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Pre-ignition
Fuel starts to burn before the spark plug fires.
Decreases engine performance and produces and
audible pinging or knocking sound in the engine.
Increases the peak combustion pressure in the
cylinder.
Increases internal temperature.
Will cause engine parts like pistons, connecting rods
and crankshafts to fail.
Causes
An overheated spark plug
Glowing carbon deposits
Overheated exhaust valve
A sharp edge in the combustion chamber or on top of
a piston
Sharp edges on valves that were reground
improperly
A lean fuel mixture.
There is another test that can be performed to evaluate
the condition of the engine cylinder
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