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mixhali mixhali is offline
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Join Date: Nov 2013
Car: 2009 335
Default Popping bang sound after WOT - 07-20-2015, 08:46 AM

Hi guys I recently had vrsf down ***** fitted and since then, only occasionally I get a pop sound from the I take area of the car. I was told it may be backfiring however to me it sounds like it's coming from the intake. It's quiet a muffled PPP but loud.

Any ideas?
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Shafer Shafer is offline
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Car: 2008 e90 335i 6MT
Default 07-21-2015, 09:51 PM

Is your charge pipe in good shape?
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Cloud9Blue Cloud9Blue is offline
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Join Date: Dec 2010
Car: 09 E92 335i
Default 07-21-2015, 10:05 PM

Sounds like backfire. Could be many things.

Check your AFR, leaking injectors, but my guess is that you might have a tiny exhaust leak from the d0wnp1pes gaskets.


09 BMW E92 335i: EFR 7670 / Motiv / AP Racing / Wavetrac / TC Kline [Full Modlist]
07 BMW R1200S: Shine Yellow / Akrapovic / Ohlins
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