Question about 2003 BMW 325

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Rattle I have a rattle under my 2001 325i. I sounds like its coming from my exhaust, but everything looks good around there. As I idle it rattles, but if i let the RPMs raise it stops

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Jack up the car when exhaust is cold, grab any heat shields to see if they are loose. You can also tap them with something to see if they vibrate. It's very common for the heat shield to rust and a corner can break free, making the annoying rattle. I've fixed this with a coat hanger cut to secure the loose shield, or a screw installed to hold it tight.

Posted on Aug 02, 2009

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Might be the tailpipe rubbing on the drive train. if it is, get it fixed immediatly to avoid harm to your drivetrain.

Posted on Aug 02, 2009

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Hello Lisa,
Rattles are always a fun thing to chase after. The first thing that comes to mind with a rattle under acceleration would be a heat sheild. Over time, heat shields which protect the under body of the car from exhaust heat come loose. Might want to have an exhaust shop take a look at it for you. I have heard of weak tack welds located on the heat sheilds by the catalytic converter. So you can ask an exhaust shop to take a look.

Although if you are one to get down under the car and a bit dirty check it out on your own. You might be able to check without putting the truck on a jack stands or a lift. Basically you will want to ensure the car is cold. If the car has not sit for a little while, I would not recommend touching the exhaust. YOU WILL get burned. :) Once your sure its cold and want to squeeze under the truck you can follow the exhaust tips all the way up to the catalytic converters. See pic below(number 16 is the heat shield). You will see the tin around them and be able to shake them a bit. If you hear your rattle there is your problem. If not check out the other heat shields.

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Good luck

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