1997 Chevrolet Cavalier

Engine problem
1997 Chevy Cavalier 4 cyl Two Wheel Drive Automatic 140, 00 miles

I have a 1997 Chevy Cavalier with a 2.4 Liter engine. My problem on it is that as soon as the engine starts running until the engine is cut off there is a knocking sound coming from the engine. What is the most common thing that this is and what do I need to check? As long as the engine is running it knocks. It sounds like a nut is loose on the inside of the engine.
December 11, 2007.

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