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I got my Sentra with the Avenir sr20det swap running. Any idea what could be causing it to run after I turn it off? When I turn the car off the engine still runs for about four seconds before it shuts off. What's causing this, and what do I need to do to fix it?
 

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That condition is called pre-ignition and is generally caused by the following:
* Running the engine with an extremely lean mixture. This could be caused by a major vacuum leak in the intake system.
* The coolant being at around the boiling point for some period of time greatly overheating the combustion chambers.
* Carbon deposits on the pistons.
* Over-advanced ignition timing.
* Using a lower octane fuel then required.
 
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