Mechanics

KNOCKING SOUND FROM THE ENGINE

1991 Pontiac Grand Am

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.
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Rich210
April 12, 2012.




Pull spark plug wires when its nocking and see if one cylinder has more of an affect on the noise than others


Djcl
Apr 12, 2012.
I dont think it has spark plug wires I no it has the 4 spark plugs on the top under the cap.
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Tiny
Rich210
Apr 12, 2012.
You can run the engine with spark plug wires jumped from the cover with the coils to the plugs. Disable one @ a time


Djcl
Apr 12, 2012.

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