Posted by Bob M on April 17, 2013 at 11:34:31 from (67.240.171.136):
In Reply to: dieseling posted by Scott Blanchard on April 17, 2013 at 08:28:45:
Scott - As others point out ignition timing cannot cause dieseling since there is no spark to "time" once the ignition is turned off.
Rather dieseling is generally caused by a combination of high compression AND hot spots in the combustion chambers. These hot spots can be carbon deposits, a bit of head gasket protruding into the cylinder or spark plugs that are too hot.
You can try running plugs a heat range or two lower and see if dieseling diminishes. As others mention setting the idle RPM as slow as possible and letting the engine idle for 1 - 2 minutes before shutting down can help a bunch.
Switching to higher octane gas MAY help if the problem is high compression. But if dieseling is from combustion chamber hot spots using 89 or 93 octane gas will make no difference. But it won't hurt anything (except your cash flow...!) to try it.
Finally if all else fails simply put the transmission in road gear then let out the clutch as you shut off the ignition.
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