Weird noise from blower near stock upper pulley
#1
#3
Cavitation.......
This condition is commonly referred to as cavitation in the blower snout. It is somewhat common, affecting approximately 20% of 2001 Ls, usually when a lower pulley is added. I believe the tolerances of the blowers were tightened up for 2001;some left the factory a little tighter than others, hence the noise.
My 2K1 Lightning had the same condition, even before installing the lower pulley. When the lower pulley was done, the noise worsened to the point where the blower literally sounded like a diesel engine. It occured only in Drive @ idle.
To temporarily help the problem, I had my Idle RPM raised to about 700 or so. This reduced the clattery noise by 90%. Subsequently, with assistance from Jim D'Amore@JDM, I was able to permanently eliminate the cavitation 100%, and at normal idle.
My 2K1 Lightning had the same condition, even before installing the lower pulley. When the lower pulley was done, the noise worsened to the point where the blower literally sounded like a diesel engine. It occured only in Drive @ idle.
To temporarily help the problem, I had my Idle RPM raised to about 700 or so. This reduced the clattery noise by 90%. Subsequently, with assistance from Jim D'Amore@JDM, I was able to permanently eliminate the cavitation 100%, and at normal idle.
#4