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Old 09-09-2012, 08:02 AM   #1
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Join Date: Sep 2012
Location: South Florida
Posts: 179
My Ride: 2001 330I
Mysterious Hose - Help find where it goes

Resolved - I have a hose coming from a unit that goes somewhere behind the engine, up against the firewall. The hose was so brittle that as soon as i held it, it broke, when I started tracing it, it broke from the other end and I could not tell what it was attached to. See the attached Pic, the hose is connected to that unit on the passenger side from of the car (2001 330i 4 dr).

What is that unit
Where does the other end of that black tube attached to (the small tube to the right)
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Last edited by Tament; 09-14-2012 at 08:20 AM.
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Old 09-09-2012, 08:04 AM   #2
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 21,975
My Ride: 330CiC, M5, X5, E93
See the first link below in my signature and look at the section on the SAP.

It should give you most of the info you need.
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 09-09-2012, 08:20 AM   #3
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Easiest is to remove cabin air filter housing, engine cover...and replace that hose as one continuous hose...at least that's what many have done, I did it myself and none the worse for it that I can tell. Use inspection mirror...you'll find that hose sticking into a port on the back of the intake manifold...the port points to the passenger side.
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Old 09-09-2012, 10:48 AM   #4
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Location: Royal Oak, Michigan
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My Ride: 2001 BMW 325xit5mt
same thing happend to me a couple weeks ago when i did my valve cover gasket, luckily i had a piece laying around that fit it, i didnt know what it was either
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Old 09-09-2012, 04:55 PM   #5
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Location: South Florida
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Thanks all, I replaced the entire thing with a tube, I had to buy a mirror, it was easy as 1,2,3....thanks for sending me the instructions JFOJ, I actually used to live Fairfax, went GMU, wished I had not moved, loved the area.
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Old 09-09-2012, 07:08 PM   #6
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Is that the Air Pump. I am assuming it is not a fuel line hose, since you would smell it if it was that. Looks like the Air Pump, which has a thick hose on one side about 8inches long and a rather thin hose on the other side that snakes around the engine and fire wall. It is a vacuum hose if it goes to the Air Pump and should trigger a fault code indicating Air Pump is bad (not the case, its the hose). I know because I just had this happen to the thick hose and changed it.
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Old 09-09-2012, 09:19 PM   #7
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Nice! I was born and raised in fairfax, actually bought my 323 in fairfax and visited gmu, got a hoodie when I was there, I might considere coming back for a concert in December
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