Re: Timing setting for 305E
Hello GMC Nut!
What you are describing, (engine run on after switching off) is also, and more commonly known as "Dieseling" which can be caused by, or contributed to by engine idle speed being too high, and/or carbon deposits in the engine reaching a point of incandescence which will be hot enough to ignite the fuel. High idle speeds exacerbate this problem. Usually, reducing idle speed fixes the problem if hot carbon deposits are not a factor. Ignition timing has no bearing on "Dieseling" or "Cadillac" as you put it.
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