>Although a tune-up always seems to cure my post-shutdown dieseling, I
>decided to test the "hot spot in the cylinder" theory.
>
>For the last few weeks, my truck has dieseled upon shutdown. I usually kill
>the engine about 5-10 seconds after pulling into my driveway. Lately I've
>pulled the choke out ALMOST to the point where the engine begins stumbling,
>and let it idle there for about 10-15 seconds before un-choking it and
>immediately shutting it off. This procedure seems to have eliminated
>dieseling after shut-off.
>
>This would suggest that there are, in fact, some hot spots in a few of the
>cylinders. Choking it prior to shutdown enriches the fuel-air mixture.
>Adding enough fuel will cool the hot areas down so that they are no longer
>sources of ignition.
>
>Now the only concern I have is cylinder wall glazing due to an overly-rich
>mixture. I don't think that 15 seconds of rich mixture will do much
>harm--at least I hope it won't. The plugs, for the most part, have a
light,
>powdery red coating on them (red presumably from the reddish lead
substitute
>I add to the gas).
>
>--Mark Masse
>1967 Kaiser M715
>
>
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