Weird sound (pops) from the exhaust

xyz100 · 07-15-2013, 05:32 AM

When in park with engine idling. I revv it up to about 2000 RPM and sharply let the throttle off. While RPMs go down I here one or two subtle pops from the exhaust. Is it because of misfires? What is it? Is it normal?

Lucky13 · 07-15-2013, 03:04 PM

Could be the wastegate on the turbo. This is a common noise on 335's and I hear it on my 335 when I am decelerating especially at slow speeds (manual) and let off the gas. I'm no engineer but I did stay at a Holiday Inn last night.

07-15-2013, 05:32 AM	#1
xyz100 Private 21 Rep 92 Posts Drives: Challenger Join Date: Jan 2013 Location: Texas iTrader: (0)	Weird sound (pops) from the exhaust When in park with engine idling. I revv it up to about 2000 RPM and sharply let the throttle off. While RPMs go down I here one or two subtle pops from the exhaust. Is it because of misfires? What is it? Is it normal?
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07-15-2013, 03:04 PM	#2
Lucky13 Lucky13 211 Rep 1,762 Posts Drives: 2014 M235 manual, 2020 X3 30X Join Date: Mar 2007 Location: Columbia, S.C. iTrader: (0)	Could be the wastegate on the turbo. This is a common noise on 335's and I hear it on my 335 when I am decelerating especially at slow speeds (manual) and let off the gas. I'm no engineer but I did stay at a Holiday Inn last night. __________________ 1995 325i, 1996 328ci, 1997 528i, 1997 Z3 2.8, 2000 528i, 2001 X5 3.0, 2001 330i Convertible, 2002 M3 Convertible, 2003 M3 Coupe, 2004 M3 Coupe, 2004 Z4 3.0, 2004 X3 3.0, 2007 X3 3.0, 2007 335i Convertible, 2013 X1 28 sdrive, 2014 M235 manual, 2020 X3 30i Xdrive
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