Thread: carburetor
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  #4  
Old 10-02-2001, 12:57 PM
Neil Eglintine
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Yeah, sounds like pre-ignition. This is caused by something in the combustion chamber running hot and igniting the fuel even without a spark.

The usual causes are poor octane fuel, ignition timing over advanced or carbon deposits.

This is less of a problem with injected engines as the fuel supply shuts off when you turn off the ignition supply.
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