View Full Version : Belt Noise vibration?

03-20-2009, 09:42 PM
when idling i have this thump thump thump sound. it is loudest on the alt tensioner idler pulley. so i replaced it. its still there. with a stethascope you can hear it when you put the rod up against the belt. can the belt have like a hard spot to cause this? ive never heard of a belt cause this much noise and vibration.

03-20-2009, 09:45 PM
could it possibly be the coupler in your supercharger? ive had them go bad and they make alot of noise sounds horrible at idle. does it go away at higher rpms?

03-20-2009, 09:46 PM
no it just gets faster. and you cant hear it on the jackshaft belt or the supercharger belt. just the main big one.

03-21-2009, 09:51 AM
is the balancer wobbling?

03-22-2009, 01:21 AM
it is not the balancer, i didnt think it was to begin with but i replaced it with a bhj and it still does it. just have not had time to replace the belt cause of the fact you have to drain the radiator to get the new one on.