Cadillac STS-V Series Forum Discussion, Supercharger rattle in front in Cadillac V-Series Forums; I seemed to have picked up an occasional rattle. I am trying to pinpoint it, but I'm thinking it's coming ...
I seemed to have picked up an occasional rattle. I am trying to pinpoint it, but I'm thinking it's coming from the front of the unit near the snout. Is it possible that it's the coupler or isolator? I did recently upgrade the pulley so the snout was off and machined, it's not sounding like a dry bearing, definitely more of a rattle. It seems to come and go and obviously observed during idle. I'm aware this things do make some noise which is normal, but this doesn't seem very normal to me. Any help would be greatly appreciated.
My vote is coupler. Did you replace it when you did the pulley? If not you may need to get one from Tim. Try to isolate the noise with a stethoscope tool. If you don't have one, you can get them cheap!
No I didn't replace the coupler. I guess I might as well pull the snout again. Yay stinky oil again. No I didn't use a stethoscope I just used a screwdriver on my ear. I can always pick one up. I'm almost thinking of replacing the bearing in the snout as well if I pull it again.
Ok an update. I pulled the snout to clean up where the previous pulley made contact. I checked the coupler, there is very little to no play. Fit new pulley, there is plenty of clearance. I put everything back together and the car is missing like crazy. Barely started. I'm thinking possible manifold gasket. I double checked everything is tight, nothing unplugged, no obvious vacuum leaks. Could I have damaged the bypass acuator? I'm just trying to brainstorm here. I guess I will start taking it apart again. I'm seriously convinced trying to mod this car was the worst mistake I've ever made. I'm almost ready to just buy a stock supercharger on ebay and throw it on and just leave it stock. I've had mulitple issues with pulleys now, never had any issues with the car until I started trying to increase the boost. Any thoughts. The only code I had was just a P0300, a mulitple misfire, so there must be spark or vacuum leak. I would guess vacuum or manifold gasket.
I didn't touch the MAF, it's plugged in. The brake booster vacuum line is connected. I loosed the supercharger bolts to tilt up the supercharger to access the snout bolts, and I did figgle with bypass actuator to remove snout other than that. I'm lost. I may have something pinched is my only thought. I'll play around tomorrow morning and see if anything is obvious.