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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1 Answer

Loud rattle sound when Idling


I suggest you have your car checked as soon as possible - while a rattling exhaust isn't desperately urgent it could be the cat breaking up which might later restrict the flow of gases. Most importantly excessively loose timing belts or chains tend to make most noise when the engine is idling. If the noise is being caused by this delay could be very expensive.

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could be the heat shield fitted to the exhaust this will rattle after a time as it rusts away. can just cut it off or repack it with installation or put a exhaust clamp around it to stop it moving. only other thing that can rattle at these rpm is the cat if it has been damaged but you can tell if you smell eggs coming out of the exhaust this is usaly a good sign its damaged.

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Sounds like you may have a exhaust loose or either the cat converter is stopping up. Some of these have baffles inside which will break loose and cause a rattling noise. When the engine is cold, start the vehicle and crawl under and hold the converter with your hand and even the exhaust to see if any pressure will stop the or alter the noise. Careful it don't take long for the exhaust to heat up. If these baffles are broke inside, it can cause the converter to become stopped up and rattle, this will also give an engine false info when it comes to the fuel and air ratio mixture. Not going to far into it, so i don't confuse you. Good Luck

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If the exhaust is not loose, rotted or leaking and you have verified that the area for this rattle is indeed coming from the exhaust, it could be a heat shield that has a broken spot weld. A heat shield is a thin metal cover on the outside of the exhaust. And are known to rattle over time.

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Rattling noise coming from my 2005 mazda 6's engine. it only happens when i drive slowly such as going through kfc drive through


Good evening.
If this is a tinny type of rattle and it only happens at certain RPM's I would look for a loose heat shield over the exhaust pipes. Have someone apply the throttle until the rattles begins and listen under the car with a long screwdriver or a yardstick. Use the screwdriver to push on the various shields surrounding the manifold and pipes until the rattle stops. then use a hose clamp or two to tighten them up.
Also I see a lot of catalytic converters that become loose internally and rattle around inside it.
The only cure for that is to replace the converter.
If this rattle is an internal engine noise you should have an experienced mechanics ears give you an opinion.

Thank you for using FixYa.

KL

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1 Answer

Rattling sound from the exhaust


The metal shielding around your catalytic converter could be rattling or the rubber donut that holds the rear tailpipe could be bad. When your car is cold shake your tailpipe and see if you can reproduce the noise. If you can your tailpipe donut is likely bad. Three dollars at any auto parts store. If it does rattle when you shake your tailpipe then the heat shield for your convert could be loose. You need to tighten it up another piece of metal between it and the converter to keep it from rattling. If you hear the rattle when you go over bumps too then your exhuast is probably, loose. Crawl under there and stake shaking things, I am sure you'll find the problem

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1 Answer

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