Ratttle from muffler only when A/C on at idle

Gunzaro · 12-11-2013, 04:10 AM

I have a rattle from under the exhaust muffler area on the LEFT of the car. Only happens at idle with the A/C on. Like a vibration or something. Anyone else have this or know what is causing it?

Constant.S · 12-11-2013, 10:12 AM

Maybe the muffler heat shield loosened up? If it's the left side it couldnt be the exhaust flap and definitely not wastegate rattle. If it's the shield it would be logical to rattle more when the A/C is on because the engine would have more load and vibrate more

ManiacGT · 12-11-2013, 10:56 AM

Quote:

Originally Posted by Constant.S

Maybe the muffler heat shield loosened up? If it's the left side it couldnt be the exhaust flap and definitely not wastegate rattle. If it's the shield it would be logical to rattle more when the A/C is on because the engine would have more load and vibrate more

I'd agree with that... hard to say really without being there.

Gunzaro · 12-12-2013, 04:26 AM

I know it's hard to say. Was thinking of bringing it in to an exhaust place to check. Doesn't happen when accelerating etc only at idle with AC on and sometimes at very low speed (eg when going into garage).

12-11-2013, 04:10 AM	#1
Gunzaro First Lieutenant 37 Rep 378 Posts Drives: Speed Racer Join Date: Jan 2011 Location: In transit iTrader: (0)	Ratttle from muffler only when A/C on at idle I have a rattle from under the exhaust muffler area on the LEFT of the car. Only happens at idle with the A/C on. Like a vibration or something. Anyone else have this or know what is causing it?
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12-11-2013, 10:12 AM	#2
Constant.S Resistance is futile... 54 Rep 640 Posts Drives: BMW Z4 E89(N54) Join Date: Nov 2010 Location: Greece/Canada iTrader: (0)	Maybe the muffler heat shield loosened up? If it's the left side it couldnt be the exhaust flap and definitely not wastegate rattle. If it's the shield it would be logical to rattle more when the A/C is on because the engine would have more load and vibrate more __________________ An ounce of performance is worth pounds of promises.
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12-12-2013, 04:26 AM	#4
Gunzaro First Lieutenant 37 Rep 378 Posts Drives: Speed Racer Join Date: Jan 2011 Location: In transit iTrader: (0)	I know it's hard to say. Was thinking of bringing it in to an exhaust place to check. Doesn't happen when accelerating etc only at idle with AC on and sometimes at very low speed (eg when going into garage).
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