Discussion:
Engine diesels after shut off. Why
(too old to reply)
Donnie
2014-02-12 20:18:00 UTC
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My 1991 geo tracker has 115000 miles. New timing belt. Fresh tune up at shop.
The engine will diesel when shut off but not every time. Engine temp is
normal. Any suggestions.
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Ed Pawlowski
2014-02-12 23:03:57 UTC
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On Wed, 12 Feb 2014 20:18:00 +0000, Donnie
Post by Donnie
My 1991 geo tracker has 115000 miles. New timing belt. Fresh tune up at shop.
The engine will diesel when shut off but not every time. Engine temp is
normal. Any suggestions.
Couple of possibilities. Carbon deposits in the cylinder that are
very hot. Wrong heat range spark plugs (were they replaced for the
tuneup?) Improperly set timing.

If it just started after the tuneup, I'd take it back and let them
know.

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