Saabscene Saab Forum - Saab Technical Information Resource banner

knocking noise

3K views 3 replies 3 participants last post by  spngbobis4me 
#1 ·
I have a 99 9-3 SE 4 door hatchback. When the car is idling and also when driving it, it's making a knocking noise. It seems to be coming from one of the pulleys that the serpentine belt is on. I have inspected the belt and I can't see any breaks or cracks in it and I tried to move the pulley itself to see if maybe it was loose and it didn't seem to be. Does anyone have any ideas what it might be? Thank you!
 
#2 ·
spngbobis4me,

Have you checked whether the noise goes away when you 'unload' the belt. Put a socket extension in the square socket in the tensioner and pull forwards while the engine is running. This takes the load off the belt so, if the noise goes away it must be related to the belt and its fittings.

Assuming it does then check all the pulleys, I would guess that one of the idler pulleys is partially seized.

Paul @ Kippen
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top