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With a carburetor-ed vehicle it was not uncommon for an engine to continue to run after you have turned the key off. It was called "dieseling". It could be caused by excessive carbon built up in the combustion camber, incorrect ignition timing, idle speed set to high, an overheated engine or all of the above. With the advance of electronic fuel injection that condition doesn't or shouldn't happen anymore.

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Q: What cause a car engine to be still running whilst switch off?
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