clayton02LS1

Ok, i'm going to try and explain this the best i can. Ok I start the car up and poke my head under the pass. side to find the noise. It usually starts about 1 minute after startup. Ok so i'm listening and theres a noise that sounds electrical and it shuts off (sounds like an air release valve letting out air) and that's when the vibration/ringing starts. You can see the y-pipe vibrating in unison with the noise. Now I just need to no what it is. All my clamps are tightened behind the cats. Keep in mind it didn't do this when I bought it in November 05' and it's gotten progressively worse to where it's almost constant, and it's running stock manifolds/y-pipe with a magnaflow catback

radz282003

iTrader: (1)

Heat shields?

clayton02LS1

Where are those located? On the manifolds?

Luna

iTrader: (6)

there are heat shields all over the place. get under the car and start smackin the pipes around to see if you can reproduce the sound, then you can try to pinpoint where its coming from.

TheBlurLS1

iTrader: (8)

The heat shields will be silver pieces of metal screwed to the bottom of the body. They have RAZOR sharp corners and just love to cut your arms/hands to shreds.

radz282003

iTrader: (1)

Yeah. Be careful. I would suggest getting the vehicle in the air, SAFELY, and bang on the headers and y-pipe where it sounds like the noise is coming from. Since it sounds like you hear it on the passenger' s side, I would look about where the collector is, where it gets close to the floor. To get good ground clearance, headers get stuffed pretty high in this area and sometimes close enough to just barely rub on the heat shields. You may also be hearing the metal retaining sleeve, that goes around the O2 sensor wires, rattling or buzzing. Mine do that. Just try checking in those areas and you will likely find something.

Gearhead1

Save your hands, get a rubber mallet to do all the banging.

clayton02LS1

Ok I banged on it with a mallet and the noise seems to be coming from the clamp right after the cat on the pass. side. But everything seems tight. Suggestions?

TheBlurLS1

iTrader: (8)

Cram a **** load of steel wool where the problem area is and stick a band-clamp around it.

clayton02LS1

Do you mean around the clamp or a spot on the pipe itself?

TheBlurLS1

iTrader: (8)

Does it has a ball/socket style clamp right there? Are you POSITIVE It's not the heat shield above the cat?

I wasn't being totally serious about the steel wool and clamp, but it might actually work to help stop the noise.

clayton02LS1

I wasn't able to get the car up to check. Can I get to it from under the hood?

senicalj4579

iTrader: (41)

im having the same problem after installing long tubes and catback. on some areas under the car i jammed a piece of garden hose in between the floorboard and pipes to keep it rattling. now i have the problem i believe your talking about and i will be using a peice of garden hose as well. this is the heat shield under the passengerside where my long tube connects to the cat.
maybee the magnaflow i pipe is rattling against the floor to your vehicle?