• Tiny
  • kalibmikhal
  • GMC

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?

Tuesday, March 14th, 2006 AT 10:17 AM

1 Answer

  • Tiny
  • rugruv
  • Member

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?

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Tuesday, March 14th, 2006 AT 1:55 PM

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