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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 05-31-2011, 10:40 AM   #1
pcstan
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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.

Thanks.
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Old 05-31-2011, 10:48 AM   #2
Solidjake
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Like a sneezing sound? That is normal.
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Old 05-31-2011, 10:58 AM   #3
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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.
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Old 05-31-2011, 08:03 PM   #4
pcstan
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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!
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Old 05-31-2011, 08:39 PM   #5
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Thats the brake booster you're hearing when you turn the car off.
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Old 05-31-2011, 08:42 PM   #6
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Originally Posted by phamine View Post
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
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Old 06-02-2011, 11:40 AM   #7
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mine only started doing it loud enough to hear from in the car when i changed my intake as well, never noticed before that
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Old 06-02-2011, 03:06 PM   #8
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I also noticed a volume increase when I installed my AFE. My last car with a ram air intake did the same as well
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Old 06-06-2011, 03:45 AM   #9
pcstan
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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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