I believe that the reason the engine continues to run is that carbon
deposits inside the combustion chamber are still burning, or are at least
hot enough to cause the fuel to ignite. The cause of the carbon deposits
is either a too rich mixture or incomplete combustion caused by poor
timing (too retarded). So, as you say, it's an indirect cause. After
correcting the contributing cause, it may take a while to burn away the
carbon enough so that the dieseling stops.
Skye Poier had this to say:
>Word on the street is that Hans Duinhoven said:
>> I have heard this more, but don't understand.
>> At time you switch off the ignition, there are no sparks at the spark plug
>> anymore. Still the engine goes on (like a diesel engine).
>> Why should the cause of this be found in the incorect timing?
>
>That was my thinking as well. The only way I can see incorrect timing
>causing run-on is if it's making the car run a lot hotter than it
>should be (over-retarded, I think). Then its sort of an indirect cause.
>
>Skye
>
>--
>1966 MGB - GHN3L Safety Fast! __,__\__
>The MGB Experience http://www.mgb.bc.ca/ (_o____o_)
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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