Originally Posted By: JimPghPA
The main drive pulley for the serpentine belt is a combination pulley and harmonic balancer. They go bad around 75K to 85K miles. There is a black rubber piece between the inner pulley and the outer drive pulley. That black rubber breaks down with age and the outer pulley becomes un-aligned and that causes the serpentine belt to fall off of the drive pulley.
Could that cause the engine to get the jitters at idle?
The main drive pulley for the serpentine belt is a combination pulley and harmonic balancer. They go bad around 75K to 85K miles. There is a black rubber piece between the inner pulley and the outer drive pulley. That black rubber breaks down with age and the outer pulley becomes un-aligned and that causes the serpentine belt to fall off of the drive pulley.
Could that cause the engine to get the jitters at idle?
