Exhaust Pop at cold start

pit1 · 04-28-2009, 10:41 AM

Over the past few weeks (before this last spur of 90 degree days) I noticed a load POP coming from my exhaust just as I would release the throttle to shift. It would happen no more than 3 times after cold start, at which time I suspect some warmer air was pushing through. I'm NOT referring the the gargle on throttle release, this is a loud POP, sounds very much like backfiring. The engine is cold, and I'm often still in my neighborhood so acceleration is very slow and conservative, we're talking shift to 2nd around 2,500.

Any thoughts?

SlickShift · 04-28-2009, 10:51 AM

http://www.1addicts.com/forums/showthread.php?t=229262

04-28-2009, 10:41 AM	#1
pit1 Captain 239 Rep 790 Posts Drives: F87 M2 Join Date: May 2008 Location: It's always Sunny... iTrader: (1)	Exhaust Pop at cold start Over the past few weeks (before this last spur of 90 degree days) I noticed a load POP coming from my exhaust just as I would release the throttle to shift. It would happen no more than 3 times after cold start, at which time I suspect some warmer air was pushing through. I'm NOT referring the the gargle on throttle release, this is a loud POP, sounds very much like backfiring. The engine is cold, and I'm often still in my neighborhood so acceleration is very slow and conservative, we're talking shift to 2nd around 2,500. Any thoughts?
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04-28-2009, 10:51 AM	#2
SlickShift Lieutenant Colonel 323 Rep 1,804 Posts Drives: '11 BMW E90 M3 ZCP, '21 X5 ZMP Join Date: May 2007 Location: Atlanta iTrader: (7)	http://www.1addicts.com/forums/showthread.php?t=229262 __________________ -Nick 2018 BMW 440i - M Sport, Exec Glacier Silver Metallic/Coral Red Dakota Retired: '00 323i, '06 325Ci, '09 135i, '06 Z4M Roadster, '93 525i, '76 2002, '14 X1, '14 M235i, '16 X4, '16 435i
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