Question about 1999 BMW 323 Series

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Rattling under car -- especially when steerling wheell is turned both ways while parked, in reverse or forward or netural . bmw 230 series

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Sounds like a loose heat shield, this shield will be mounted to the cat. converter. With the engine running and idling turning the wheel will cause a bit of vibration down thru your exhaust system causing the shield to vibrate.

Posted on Jul 18, 2009

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Loose exhaust may be touching the steering rack !

Posted on Jul 18, 2009

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While driving at higher speeds you may not notice a sound as much as when you are drivng in reverse as you usually drive slower in reverse. This leads me to think that the rattling can be caused by a loose protective plate under the car. When a load is put on the engine, it tends to vibrate more this vibration can cause a lose plate to rattle more. This is the cheap answer. That is if you are definitely sure the sound is coming from under the vehicle. Otherwise, you may have a crank shaft problem or a seal in the bottom half of the motor could be bad. You may want to crawl under the car and try to shake some of those plates underneath. If none of them are loose take the car to BMW it shouldn't cast anything for them to look at it unless they have to hook it up to the computer.
Please remember that if you intend to climb crawl under your car, you must make sure that your car is properly supported to prevent serious injury. Also, if your driving with a loose plate, it could easily fly off while driving or if you hit a bump. This could cause serious damage to your vehicle. Also, please check you oil levels and make sure you do not have an oil pressure light coming on when you hear this noise.

Posted on Jul 18, 2009

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