Mechanics

KNOCKING SOUND IN GRAND PRIX

GMC Other

I have a 1994 Grand prix (180k miles). Whenever the engine is started, the car makes a knocking noise that sounds like it is coming from the top middle area in the engine, on the passenger side. When the engine warms up a little it seems to go away, but when I push on the accelerator it comes back. I did notice the tensioner (for the serpentine) arm moved up and down very quickly when the vehicle was on. I've never seen one move in a vehicle.

Do I just have a bad tensioner that's hitting against something, or should I check for something else?
Avatar
Kalibmikhal
March 14, 2006.




Top middle engine knocking. Perhaps a collapsed lifter? As the engine warms up, the oil gets in and the knock can go away. Know anybody with a stethoscope who can properly locate the knock?

Tiny
Rugruv
Mar 14, 2006.


AD