Exhaust Rattle when cold

[nickmnusa]

Here is a question wondering if anyone else has experienced this? When I first start my car there is an exhaust rattle that occurs between 1500rpm-2200rpm. My car is brand new and has 3000 miles on it I took it to the dealership and the mechanic said that it was the flex pipe under the front of the vehicle and that it will rattle when it is cold because it expands and contracts. Anyone ever hear of this before? Thanks

[luv2uallday]

that sounds wierd mine does not do that at all. it can be two things.... the flex pipe has broken loose inside and is ratlling due to higher vibration at higher rpms OR the catalitic converter the baffalls or the honeycomb assembly inside has became loose and rattles due to higher vibration or the shell and or heat gaurds of the cat became loose.. these two things are not normal and are not part of the design... Also, there could be a loose bracket brace something that could cause this too... but those are the 3 things i can think of

[NYChevoo]

hey just an idea. on my 04 sedan there is a donut shaped metal shield around the flex pipe. i'm not sure what its function is, but mine broke loose and made this tinny rattling sound. i cut it off with metal shears.

[Aveo07z]

I am also having that same sound.. and its happens almost always when i first start my car up and go to drive.. Its either the pipe or a heat shield, Imm gonna have the flex pip redone so ill let you know if it goes away after tajt

[mikedudley17]

i had a rattle once as well. turned out one of the resonators on my exhaust had gone bad and the "junk" inside had come loose. cut out resonator-problem solved. it could be so many different things tho...

[NYChevoo]

yeah, what he said!!

[nickmnusa]

Well after 2 trips to the dealer and alot of "I cant hear it can you come in and point it out to us" by the mechanics it is finally fixed turned out to be the piece of flex pipe underneath the motor I think they cut it out and put a new piece in :P

[ruby]

it hapened to me too. i got a new flex pipe !

[ruby]

yep me two ( o i mean too) i got one under waranty

[07_aveo]

I got the run around from the dealer on this one. They said it would have to get worse before they would do anything about it.