Martin asked: "...What would cause an engine to continue running for a few
seconds after the ignition has been turned off?..."
Engine running too hot (for a variety of reasons)
Build-up of soot particles on the cylinder head / top of piston (strip
engine and clean!!)
I have a vague feeling that running too rich, in conjuction with one of the
above problems, can make this worse, but is unlikely to be the sole cause
(and I could be wrong about that).
I hope some others come in with advice on this, 'cos it's not my greatest
area of expertise, since I never really suffered from it!
Some people have fitted a valve that lets more air into the manifold when
the ignition is switched off, to stop this over-run. This, of course,
treats the symptoms, not the cause...
Richard Gosling
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