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-   -   Engine makes a "CHUFF" sound when I turn it off (http://forum.e46fanatics.com/showthread.php?t=847675)

pcstan 05-31-2011 10:40 AM

Engine makes a "CHUFF" sound when I turn it off
I just rebuilt my alternator and while I was already greasy I dropped in a new set of plugs. I used Bosch +4 iR Fusion (Platinum/Iridium surface gap hybrid). When I got everything back together and went for a test drive it was fine. When I shut off the engine it made a "chuff" sound through the airbox (pretty sure) like a valve releasing compression from a cylinder. It's never done this before but now it does it every time. Any ideas?

It's a 2003 330CiC Sport.


Solidjake 05-31-2011 10:48 AM

Like a sneezing sound? That is normal.

spencers 05-31-2011 10:58 AM

Yeah, it has to be normal. My car, my mother's car, and my dad's car (all M54's) all make the same noise on occasion when shutting the engine off.

pcstan 05-31-2011 08:03 PM

Thanks for the input. I'll sleep better tonight. Any idea why it started so suddenly? (right after a tune-up, oil change and alternator). Just curious.

Thanks again!

phamine 05-31-2011 08:39 PM

Thats the brake booster you're hearing when you turn the car off.

JJR4884 05-31-2011 08:42 PM


Originally Posted by phamine (Post 13228570)
Thats the brake booster you're hearing when you turn the car off.

then why is mine louder since i have a k&n 57 intake... iirc, its the intake making that noise

fuufuu 06-02-2011 11:40 AM

mine only started doing it loud enough to hear from in the car when i changed my intake as well, never noticed before that

e46mook 06-02-2011 03:06 PM

I also noticed a volume increase when I installed my AFE. My last car with a ram air intake did the same as well

pcstan 06-06-2011 03:45 AM

During my tune-up/alternator repair I pulled out my air filter (K&N) and washed & oiled it. While the airbox was open I had someone start the car then shut it off. The sneeze/chuff/pressure release sound came out of the intake with a little puff of air. Odd that it would start doing that now.

UPDATE: Now I have a dreaded "check engine" light. It's code PO174 (Bank 2 running lean). Coincidence? I've heard everything from K&N oil in the MAF to cracked intake manifold to intake manifold gasket/seal issues to "unsolvable" regarding this one. Anyone want to take a fresh shot at it? I suppose I'll start by pulling the intake manifold, checking it for cracks and reassembling with all new seals. If that doesn't work....

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