Funny sound when I take off or Rev

[SamG97Camaro]

When I rev the car up it's fine, but on the down part it makes this funny noise, it's hard to describe, almost like something metal is hitting together. The same sounds comes up when I start to take off. Sorry that the description is vague but please help!

[Tyler]

does it sound like a sqeaking rat like sound?

if so it could be a slight heat shield rattle, or bolt.


with my headers, no matter how tight i tighten the y pip flanges to the header, the bolts still let out a squeak when revving

[Silv6]

Originally posted by Tyler:

with my headers, no matter how tight i tighten the y pip flanges to the header, the bolts still let out a squeak when revving

same thing on mine, unbolt the hearder to y pipe bolts, they need 2 washers. the bolts are bottomed out.

[Tyler]

ya.. i have 4-5 washers on each bolt.. and mad lock tite.. but it still does it

[hockeyman]

Originally posted by Tyler:
ya.. i have 4-5 washers on each bolt.. and mad lock tite.. but it still does it

Loctite probably melts off after the exhaust reaches operating temp. I'd find someone who can weld it for you.

[BLLDOGG]

did you ever think it might be a bad cat.?

[SamG97Camaro]

BLLDOGG my one friend said it might be my cat, I think I might try n just take it off n go without it. It's not a rat sound its like a rattling clank. Thanks for the help guys!

[ArticRider]

I think I know what you are talking about. Can you hear it from inside your car? I have only heard it once on my car...and not from the inside. I was oblivious to the fact that there was this very quick rattling/grinding as I let it die down from a about a 4,000 rev. It came on for just a split second. My friend was video taping and I was watching it later and noticed it. Otherwise, I wouldn't have known. I think that's the only time it did it or I heard it...of course I don't normally rev my engine or stand outside my car and let another dude rev it.

I don't know what it is. Heat shield maybe? Possibly. I have a dynomax super turbo muffler back there with dual tips. Automatic tranny if that makes a difference at all(which it shouldn't). Hope you figure it out.

[97bird]

I have a rattling sound on the way down when I rev mine up over 3500, but only when it is in neutral, and I can definitely here it from the inside. Where is the heat shield?
And samg97camaro does it sound like it is coming from the front or is it underneath around the cat?

[SamG97Camaro]

I can hear it from inside..sounds more like underneath.

[camaro2495]

it is your heat sheild located near the y-pipe