knocking sound from the engine

1991 PONTIAC GRAND AM
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RICH210
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My 1991 Pontiac grand am has a knocking sound from the motor people say it could be the piston and someone said it could be the flywheel whats your answer?

its starts but it has a bad knocking sound cant really figure it out..
Apr 12, 2012 at 9:46 PM
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DJCL
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Pull spark plug wires when its nocking and see if one cylinder has more of an affect on the noise than others
Apr 12, 2012 at 9:57 PM
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RICH210
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i dont think it has spark plug wires i no it has the 4 spark plugs on the top under the cap.
Apr 12, 2012 at 10:25 PM
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DJCL
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You can run the engine with spark plug wires jumped from the cover with the coils to the plugs. Disable one @ a time
Apr 12, 2012 at 10:36 PM