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M115 Engine overrun

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Old Sep 25, 2011 | 11:24 AM
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shan
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Joined: Jan 2007
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From: Malaysia
W203 (2007), W120 (1962)
Angry M115 Engine overrun
I have a 1979 W123 with M115 engine. When the engine is hot, it overruns -
the engine continues to run after the ignition is switched off.
I have checked the idle shut off valve. It seems to be fine, coming on with a click sound when the ignition switch is on and going of when switched off.
Could over advanced or retarded ignition timing cause this in a gas engine?
What other possibilities?
Shan.
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