Exaust rattle

[andyman32392]

Hey everyone I have an 08' V6 and was wondering about an exhaust rattle. I still hsve basically stock piping but I had my rear two cats removed and replaced with pipe that was just welded in. What in that area would cause a raddle when my car is on mainly at idle.

 

[jetboy1975]

Were the heat shields removed when the cats were? The bolts on the shields are usually the first to rust out and will cause a rattle. I'd start by looking there. You can remove the shileds if they weren't or take the bolts out and put a large washers on them and then put back in.

 

[andyman32392]

I will have to check that but I dont think there were any heat shields on the second cats they are the one's behind the O2 sensors

 

[kylebacc]

also I would check the screws that hold the piping together right before the muffler. The ones with the little spring things. I was never able to get those to go on just right again, and it always rattled at lower speeds. I ended up having to take them out and using an impact wrench to tighten some regular nuts and bolts there. Good luck!

 

[berettashot117]

does the v8 have the same pre/post cat setup as the v6? if so those post cats are definately comin off

 

[rook]

Were the heat shields removed when the cats were? The bolts on the shields are usually the first to rust out and will cause a rattle. I'd start by looking there. You can remove the shileds if they weren't or take the bolts out and put a large washers on them and then put back in.

:iagree:

The heat shields are not attached to the cats, they attach to the body. Once the corrosion forms, it does not take much to get the shields loose.