Question about 2007 BMW 3 Series 328i

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Why when i accelerate a harsh rattling in rear of car?

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It could be something as simple as a broken exhaust hanger, take a look underneath, move the muffler and see if you hear it. I could also be a heat shield that has come loose.

Posted on May 18, 2014

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Ok if it is rear wheel drive. It is most likely the pinion gear. But also could be a bad u joint! The pinion I would take to train pro! Jack up the car and make secure on jack stands, then lightly apply the jack for added support. Start the car and put in gear at an idol use a piece of garden hose placing it on the differential and to your ear. Should be able to hear were the noise is coming from. My opinion take it for what it is! good luck and be careful.

Posted on May 18, 2014

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