The idler pulley for the serpentine belt can fail causing noise from the belt area. Our technicians report the pulley has been known to fail completely which can cause the belt to break or be thrown off.
Average mileage: 97,931 (25,000–152,800)
Engines affected: 2.3L 4 Cylinder Turbo, 3.0L V6 Turbo, V6
25 people reported this problem
Idler Pulley squeaking, put WD-40 on it which did make it stop squeaking, but I fear the bearings are going to lock up and break the belt. Part is $50-$75 with it costing about 1 hour labor to put it in or do it yourself.
Last few days on cold start engine idles very rough up and down between 1k-3k rpm then dies, second start idles rough for a seconds then idles / drives normally.
Same thing happened on my 9-3, Had the pulley and belt replaced, I spent about $150.00 parts and labor. Now I'm repeating the process with my 9-5.