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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Aug-11-2017, 11:52:14 PM   #1
Acalyst
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Default Where is this hose

Hey guys, a mechanic took a look at my car and said my plenium drain hose was disconnected... What does that mean, what does that hose do and is the reason for my vaccum leak?
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Old Fri, Aug-11-2017, 11:59:49 PM   #2
TboneM3
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Default Re: Where is this hose

Could be. There are several lines coming off the intake box - not sure which he means - probably not the one from the valve cover to airbox, but could be the one underneath?
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Old Sat, Aug-12-2017, 02:30:45 PM   #3
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Default Re: Where is this hose

There is an oil return hose on the bottom of the plenum. That drains any oil collected from the crankcase vent back into the oil pan. He probably meant that, it's a a fairly small hose but would be a vacuum leak.
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Old Sat, Aug-12-2017, 07:29:25 PM   #4
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Default Re: Where is this hose

If the oil drain hose is off, then yes that's a massive vac leak. Its about a 1/4 hole. Remove the intake elbow and box then reach under there to push it back on.
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Discussing Where is this hose in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)