The last two times I drove my car the engine dieseled for several seconds when I turned off the key. What is the likely cause?? Nothing has been changed otherwise. Always ran very well without issues.
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The last two times I drove my car the engine dieseled for several seconds when I turned off the key. What is the likely cause?? Nothing has been changed otherwise. Always ran very well without issues.
You didn't say what car you have the trouble with, but typically dieseling, or run-on can be caused by an idle speed that is set too high on a carbureted engine or by low octane fuel, (fuel vapours continue to burn from heat in the cylinders). Higher octane is less volatile.
Sorry--1970 911S CoupeQuote:
Originally Posted by Jones
I'm betting on a bad tank of gas. Too much ethanol, or lower than advertised octane.
Same often happens to my 1972 S, and I’ve been told it’s due to the engine running rich.
Would love to hear from Ed on this interesting topic...
Here’s a generic article...
https://axleaddict.com/auto-repair/W...-Keeps-Running
I think we have a winner. Filled up with fresh tank of Shell premium and no more issues--not even a hint of run-on. Added a can of Seafoam to remove any excess carbon from cold weather driving, etc. Took a long drive. Runs great again.Quote:
Originally Posted by Arne
Great advice, great outcome.... congrats Frank !!!