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Join Date: Feb 2008
Location: United Kingdom
Re: Engine detonations - poor or rich fuel mixture??
I' think you've had the belt done recently, the inlet cam asn't been tightened up and it's bent the valves allowing the ignition to backfire.
This means time for a compression test first. If that proves fruitful and all is OK, then change the knock sensor, it may be that telling the ECU lies and puting the ignition timing out.