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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 10-29-2012, 06:00 PM   #1
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Join Date: Oct 2012
Location: Orange County, CA
Posts: 1
My Ride: 2003 325ci
Exclamation Jet-like noise coming from under hood

First post, first BMW, sorry if I posted in the wrong area. (and if it drags on..)

Just purchased a 03' 325ci 2 months ago w/120,000 mi. at purchase. Everything with the car is running great and I have no check engine light on, but about a month ago when the temperature dropped at night in my area my car would make a whiney jet-like noise the next day. It would only last for about 10 seconds then go away.
But 2 weeks ago the noise has started to prolong and now goes on for about 2-4 minutes (or until my car is fully warmed up). I've done some research and the symptoms point to the Secondary Air system, but I have no clue

Car is a manual trans..

Anyone know where the secondary air pump is located so I can check it for rips or holes? I know it's only getting worse. Will post a video later tonight
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hose, intake, noise, pump, secondary

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