Single click noise sometimes when blipping throttle

claasmi · 07-25-2015, 10:43 AM

I've noticed that sometimes when I blip the throttle to rev match when downshifting I will hear a single click noise. It sounds like it's comming from the back of the car and also it sounds similar to a click I hear when turning off the car. It's a 2012 128i with about 80k KM on it.

Anyone have any idea what this might be? I was thinking maybe it's just the exhaust flap valve activating, but I don't think it should be that loud, and also I'm pretty it happens even when the revs don't go above 3500.

Pissoff · 07-25-2015, 11:05 AM

Yes , the exhaust flap. It is vacuum actuated. When you blip the throttle you lower the vacuum. I don't get the click now that I golf tee the flapper. Before that I could hear when it would flap shut.

ShocknAwe · 07-25-2015, 11:11 AM

Exhaust flap is fairly loud.

claasmi · 07-25-2015, 04:14 PM

Quote:

Originally Posted by Coleroad

Yes , the exhaust flap. It is vacuum actuated. When you blip the throttle you lower the vacuum. I don't get the click now that I golf tee the flapper. Before that I could hear when it would flap shut.

Yup. I did the golf tee mod today and it completely went away.

BMW135pls · 07-25-2015, 06:13 PM

Yeah, get an aftermarket catback on there. Between what you said and a scratching noise after every start, I got tired of explaining to people that my high powered, well dressed luxury car is "supposed to sound like that."

Pissoff · 07-25-2015, 06:31 PM

Quote:

Originally Posted by BMW135pls

Yeah, get an aftermarket catback on there. Between what you said and a scratching noise after every start, I got tired of explaining to people that my high powered, well dressed luxury car is "supposed to sound like that."

128i doesn't have a scratching sound. Maybe that's a 135i thing?

BMW135pls · 07-25-2015, 06:37 PM

Quote:

Originally Posted by Coleroad

128i doesn't have a scratching sound. Maybe that's a 135i thing?

Likely it just scratches when it needs to be greased. I probably could have greased it, but imo exhausts shouldn't have silly flaps anyway, so either way I was acting on principle when I swapped it.

BMW135pls · 07-25-2015, 09:38 PM

Quote:

Originally Posted by Coleroad

128i doesn't have a scratching sound. Maybe that's a 135i thing?

This is the scratch noise, someone else's clip.

https://clyp.it/search?type=hashtag&query=ExhaustRattle

It's awful. The 128i and 135i have the same stock exhaust, so it should be applicable to both platforms.

07-25-2015, 10:43 AM	#1
claasmi Private 37 Rep 56 Posts Drives: 2011 128i 6MT Join Date: Jun 2015 Location: Toronto iTrader: (0) Garage List 2011 128i [0.00]	Single click noise sometimes when blipping throttle I've noticed that sometimes when I blip the throttle to rev match when downshifting I will hear a single click noise. It sounds like it's comming from the back of the car and also it sounds similar to a click I hear when turning off the car. It's a 2012 128i with about 80k KM on it. Anyone have any idea what this might be? I was thinking maybe it's just the exhaust flap valve activating, but I don't think it should be that loud, and also I'm pretty it happens even when the revs don't go above 3500.
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07-25-2015, 11:05 AM	#2
Pissoff Banned 55 Rep 206 Posts Drives: 08, 128i e88 Join Date: May 2015 Location: Fuck you iTrader: (1)	Yes , the exhaust flap. It is vacuum actuated. When you blip the throttle you lower the vacuum. I don't get the click now that I golf tee the flapper. Before that I could hear when it would flap shut.
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07-25-2015, 11:11 AM	#3
ShocknAwe 1Addict 3233 Rep 7,893 Posts Drives: E82 Mutt, M57 Truck Join Date: Jul 2012 Location: Charleston iTrader: (22)	Exhaust flap is fairly loud. __________________ 2010 135i 6MT Jet Black N54/3 FE82 Mutt \| BUILD THREAD \| GARAGE SALE
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07-25-2015, 06:13 PM	#5
BMW135pls First Lieutenant 90 Rep 341 Posts Drives: Bucket of screws and sadness Join Date: Jul 2014 Location: NJ, USA iTrader: (0)	Yeah, get an aftermarket catback on there. Between what you said and a scratching noise after every start, I got tired of explaining to people that my high powered, well dressed luxury car is "supposed to sound like that." __________________ Model: '08 135i N54 6AT Coupe ///M Sport - E85 + 93 = E30 Mods: AA DPs + Gen I - BMS JB4 (Race + Map 2) + DCI + OCC - Cobb CP - ///M RSFB + Front Control Arms - Koni Yellow - Swift Spec R - Vorshlag camber plates - MPSS 225/255 - x-ph Angel Eyes 160w
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