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Why is your car keep running when you pull the key out of the ignition have a 1990.300zx twin turbo?
Wiki User
∙ 13y ago
This could be 1 of 2 things.
You could have a problem with Pre-Ignition - Over run, which can lead to Catastrophic Engine Failure if not resolved quickly.
Or...
This could just be a Turbo Timer which is designed to keep the engine running after you take out your key for a set amount of time (usually 1-2 minutes) to enable your turbo/s to cool down slowly and properly, otherwise, if it/they cooled down too quickly the heat could crack an impeller blade or even cause damage to the impeller bearings. And that would not be cheap to repair.
Most Turbo's are either Water or Oil cooled so by letting the engine run longer once used, it allows the fluid (Oil/Water) to cool and relax the turbo/s before switching off.
If this is the case, then you don't have to wait for the engine to shut off just lock it up and carry on with whatever you are doing.
Hope this helps
Wiki User
∙ 13y ago
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