Engine noise, possible worn supercharger coupler?

**MM704** · 07-17-2015

I've noticed within the past couple of weeks that when my GTP is idling it makes a bit of a knocking sound. Could it be a bad supercharger coupler? I've heard that they tend to go bad on these. Hopefully it's nothing more serious I take pretty good care of this thing. I'm running a 3.5 press on pulley with supporting mods. It has about 123k miles on it. Please check out the short video clip and tell me what you think. You can really hear it around the 0:13 mark. Thanks so much!

https://www.youtube.com/watch?v=nIpIrwsn5pg

**bandook** · 07-17-2015

Take the belt off the sc and see if noise is still there. You can spin the sc pulley back and forth and feel if there is play. Spin the idler pullies too. Possibly a tensioner. If noise is still there with belt off it might be your harmonic balancer.