İnteresting sound

[saabturk]

My SAAB is 1998 years 9-5 SE LPT. Automatic. When gear is P, idle is normally. When gear is R or N, idle is some down. So i am turning my wheels a little; my idle is low and coming knocking sound and i feel engine will stop. But no stop. What is the problem ??? Sorry for my english...

[Burnsside42]

Typical noise could be the Serpintine/Drive belt slapping. Your car if it's a 2.3L 4 cylinder has two different belt options - both work effectively - but one makes noise. If your belt makes a straight path across the top pulleys (beneath the "U shaped" motor mount brakcet) then you have the SHORT BELT = the noisy setup, but more reliable/cheaper option. If the belt makes a "V" in the middle down to the center idler pulley then it's the long belt. This route usually is quiet unless the belt tensioner is worn out and flopping around alot.

See if this is you problem - report back. Thanks!