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Two answers:

  1. If it is an old car with a carburetor you could be suffering from a condition called pre-ignition or run on (same thing) the engine will rattle clatter and shake. This is caused by carbon build up. Change the spark plugs, check the mixture, and then try to de-carbon the engine
  2. On a new automobile with injection you have a bad ignition switch or relay.
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Q: Why does the engine keep running when the car is turned off?
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Why does an engine keep running when ignition key is turned off?

Its not your engine. Its the fan running to cool the engine down. They all do it and nothing is wrong with your car.


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What would keep a car running after turning the key off?

A malfunctioning the ignition switch will allow the car to keep running after the key is turned off. You can remove the positive ground cable from the battery to shut the car off.


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Why does the fan keep running on a 1983 caprice classic when engine is off?

If the fan keeps running it's because it is electric and wired through a temperature switch not the ignition. Electric Fan running is independent of engine running. When the temperature is high enough to start the fan, it goes on. when the temp drops the fan goes off. Temp does not drop right away when the car is turned off. It can actually rise several degrees when the engine is turned off. The fan running after engine shut off is actually a good thing that may prevent radiator overflow


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Why won't a car start without it's batteries?

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Why does the engine of my 1985 Mercedes 300 SD keep running after the key is turned off?

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When was Keep the Car Running created?

Keep the Car Running was created on 2007-03-19.