Rattling noise during acceleration

Reply Subscribe

Thread Tools

Search this Thread

Apr 15, 2009 | 11:39 PM

craigwirth

Thread Starter

Heel & Toe

Joined: Oct 2008

Posts: 15

Likes: 0

From: Dallas Texas

Rattling noise during acceleration

I have a 2000 A4 Coupe and I hear a pronounced rattling sound when I accelerate. I've had it checked at three locations(2 well known corvette shops and 1 Midas ha!) and they told me it wasn't exhaust but couldn't identify it either. Anyone hear of this before?

Apr 16, 2009 | 06:24 AM

9secondflat

Melting Slicks

Joined: Dec 2005

Posts: 2,291

Likes: 0

From: sterling ct

if you have cats...they could be breaking up and rattling inside the converter itself...(i had an older car that sounded like a rattle trap when i accelerated)

Apr 16, 2009 | 09:12 AM

craigwirth

Thread Starter

Heel & Toe

Joined: Oct 2008

Posts: 15

Likes: 0

From: Dallas Texas

I had the entire middle section replaced so I'm relatively certain its not the cats. Could it be loose headers?

Apr 16, 2009 | 03:53 PM

9secondflat

Melting Slicks

Joined: Dec 2005

Posts: 2,291

Likes: 0

From: sterling ct

if headers were not fit correctly, you would have a ticking sound coming from under the hood....

Apr 16, 2009 | 10:57 PM

DeltaBravo

Instructor

Joined: Apr 2008

Posts: 239

Likes: 2

From: Georgetown TX

Okay, dumb question, but have you ruled out pinging? If it's pinging, a can of SeaFoam in the tank, and several full throttle accelerations will cure it. Worked for me!

Apr 17, 2009 | 12:27 AM

KRISCO

Racer

Joined: May 2007

Posts: 332

Likes: 1

From: Spokane WA

Quote:

Originally Posted by craigwirth

Yep. Of course describing sounds is very difficult, but it is worth your time to get under the car with a rubber mallet and see what you can find. If it is a cat comming apart, you would likely be getting a TWC Low Efficiency Code. Are you getting a "check engine" light?

Apr 17, 2009 | 07:59 AM

craigwirth

Thread Starter

Heel & Toe

Joined: Oct 2008

Posts: 15

Likes: 0

From: Dallas Texas

I'm heading in to 21st Century Muscle Cars of Dallas to replace my 2:73's with 3:42's this morning and I'll ask them about the cats and pinging. Thanks for your input! I'll let ya'll know what I find out.

Apr 17, 2009 | 05:45 PM

craigwirth

Thread Starter

Heel & Toe

Joined: Oct 2008

Posts: 15

Likes: 0

From: Dallas Texas

They still weren't sure what was causing the rattle but they think it may be either a faulty torque tube or the dampner(?). Which sucks, but it's better than the tranny. They had a few other 2000's and they all had the same sound to a lesser degree. It seems that GM made a change mid way in 2000 on the dampner(?) to resolve the vibration and I suppose mine rolled out before that. I think its about 2 grand to replace the tube so I'll see if I can live with it.

Either way, the 2:73 to 3:42 swap went off without a hitch and the difference is phenomenal. John Page at 21st Century Muscle Cars aka Lingenfelter did an awesome job! Great shop, good people. Anyone in Dallas that needs performance work should look them up.