Question about Pontiac Grand Prix
P0331 Spark Knock has not been sensed
The spark knock or ping is 2 flame fronts colliding in the combustion chamber, the shock wave of which can eventually blow holes through the piston crowns if severe enough. In late model engines the causes can include:
- fuel octane too low
- EGR system malfunction
- knock sensor (if equipped) malfunction
- PCM software not retarding ignition timing as required
- high engine operating temperature
- lean fuel mixture
- carbon deposits on piston crowns/combustion chambers
Posted on Aug 20, 2010
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Posted on Jan 02, 2017
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