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Old Jul 11, 2011 | 02:57 PM
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Xwarrior86
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Need detonation help

I've got a 4 cylinder Mercruiser motor I'm working on and I need help from the pros out there.
It sounds like a lawnmower when I crank it up over 2000 RPM and the idle is very termpermental. I've been told it sounds like detonation. I've tried setting the timing back and little and richening the mixture but nothing helps. Any thoughts?
 
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Old Jul 11, 2011 | 04:10 PM
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Vacuum leak ? Does it have a pot metal egr plate on it ?
 
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Old Jul 11, 2011 | 04:39 PM
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No EGR whatsoever. I did discover what could be a vacuum leak. -one that could be allowing water into the CC.
 
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