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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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Old 09-11-2013, 01:36 PM
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mb67 mb67 is offline
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Mein Auto: 2008 335i Conv (E93)
Exhaust 'backfire' Issue

Hello,

I've had my '08 E93 for just over a month now and I've noticed a rather odd sound emanating from the left exhaust: Upon accelerating from a stop (or near stop) I hear a kind of 'backfire' from the left exhaust. After the car gets going the noise is gone, so it only happens right after I accelerate.

Any ideas on what this might be?
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Old 09-11-2013, 01:49 PM
fdriller9 fdriller9 is offline
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My bet is that the butterfly valve in your muffler is broken.

If you look into the driver's side muffler tip, you will see the butterfly valve. It's operated by vacuum and you will see the hose coming out of the valve when you get under the car.
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Old 09-11-2013, 01:53 PM
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Quote:
Originally Posted by fdriller9 View Post
My bet is that the butterfly valve in your muffler is broken.

If you look into the driver's side muffler tip, you will see the butterfly valve. It's operated by vacuum and you will see the hose coming out of the valve when you get under the car.

Thanks. I'll look into this once I get home from work tonight.
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