Posted by Bob M on August 10, 2010 at 12:52:05 from (74.67.185.194):
In Reply to: SM Dieseling posted by kopeck on August 10, 2010 at 09:53:57:
Dieseling, a backfire or an occasional backward spin is not unusual for a Super M at shutdown .
Working the engine hard for a few minutes to burn out carbon deposits sometime helps. So also does switching to a higher octane fuel. And as others point out adjusting the low idle RPM down as slow as possible - 425 RPM or so - and letting the engine idle a minute before hitting the switch can help.
However DON'T mess with the ignition timing - it will accomplish nothing (there's no "spark timing" when the ignition is switch is off!)
Incidentally dieseling at shutdown hurts nothing. Our two SM's have done it for 55+ years with no ill effects whatsoever.
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