knocking sound from the engine

1991 PONTIAC GRAND AM
Avatar
RICH210
  • MEMBER
  • 2 POSTS
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
Advertisement
Avatar
DJCL
  • CAR REPAIR CONTRIBUTOR
  • 767 POSTS
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
Avatar
RICH210
  • MEMBER
  • 2 POSTS
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
Avatar
DJCL
  • CAR REPAIR CONTRIBUTOR
  • 767 POSTS
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
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.