Engine run-on


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Posted by Gordon Maney on Tuesday, October 11, 2005 at 1:54PM :

In Reply to: Question RE: Backfiring posted by dave horvath on Tuesday, October 11, 2005 at 10:28AM :

If you are talking about something occurring after you shut off the switch, I would not call that backfiring. Various terms that have been used to describe that include run-on, after-run, and dieseling.

If your engine continues to run, even if very badly, after shutting off the switch, then your engine is a compression ignition or surface ignition engine at that point, rather than a spark ignition engine, which is what you hoped for. Desperate people have tried to remove all of their spark plug wires to stop a dieseling engine, only to watch it continue to buck and knock and run, as all the plug wires lie on the ground around the vehicle.

Excessive idle speed, extremely hot carbon deposits in the combustion chambers, marginal overheating, excessively lean mixtures, vacuum leaks, in various and critical combinations work together to cause this.

Is your idles speed nice and slow? Will it run smoothly at very low speed, say 400-500 rpm? You might want to run a de-carbon product through it. What do we know about the operating temperature?

Study those things.





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