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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Tweaked or broken vacuum line?



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      02-01-2013, 05:01 PM   #1
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Tweaked or broken vacuum line?

Some help pleaseÖso my independent helped me clean off an old coolant leak stain on the coolant reservoir of my totally stock 2008 E92 335i and in doing this either broke off or knocked off one of my vacuum hoses (see red arrow on attached picture).

When the engine is idling and the hood is up, the air leak from the vacuum line is audibly very noticeable.

Some notes:

-Prior to me figuring this leak out, I got 2 reduced engine power warnings. My independent said he didnít find anything after checking this on the GT1.

-The Check Engine Light came on when the independent was doing a road test, but he didnít find anything wrong and cleared this with his hand scanner (donít know how he missed the hissing vacuum line ).

Any idea how to fix this? I'd have my indy do this, but he's out of town for the next month.

How does my loose vacuum hose attach to the vacuum tank?

Is there a nipple or something that the hose attaches to?

Am I damaging my engine by driving the car with the loose vacuum hose?

Thanks in advance!
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      02-01-2013, 05:40 PM   #2
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There is a nipple. It's attached in the picture. It's still leaking even though its attached?
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      02-01-2013, 06:51 PM   #3
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Quote:
Originally Posted by NTXE92 View Post
There is a nipple. It's attached in the picture. It's still leaking even though its attached?
Thanks for the info...yup, there's a very loud hissing noise coming from that area I highlighted when the engine is on.

The hose is slightly bent/angled toward the cabin area of the car (as opposed to being perfectly perpendicular to the vacuum tank) which leads me to think the nipple must have broken off and is stuck in the hose?

From the picture, you can see the offending hose is not perfectly flush with the tank. When I bend the hose a little to be flush with the tank, the hissing goes away, but it won't stay in place.

(Sorry for the basic Q?, I really don't know much about engines) Can I just pull the hose off the vacuum tank and reattach to inspect what's going on, or is some special tool or adhesive required?
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      02-01-2013, 08:27 PM   #4
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Take the hose off and see if the nipple is broken. If it is re secure it with loctite brand plastic epoxy or another comparable epoxy. Take care not to use too much, you don't want it to squeeze inward and clog the orifice. If the break is low enough you can flow some epoxy on the outside of the break to reinforce it after the initial repair has been made.
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      02-01-2013, 08:42 PM   #5
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Quote:
Originally Posted by NTXE92 View Post
Take the hose off and see if the nipple is broken. If it is re secure it with loctite brand plastic epoxy or another comparable epoxy. Take care not to use too much, you don't want it to squeeze inward and clog the orifice. If the break is low enough you can flow some epoxy on the outside of the break to reinforce it after the initial repair has been made.
Thanks, I'll try it out this weekend

Are these vacuum hoses normally secured to the tank via epoxy (or some other substance), or the hose usually just fits snug agains the nipple?
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      02-01-2013, 08:54 PM   #6
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The nipple is barbed and the hose just slips on. Over time the hose kind of adheres itself on to the plastic though so they can be tough to take off without breaking the hose. I'm not sure what causes this at the material or chemical level but you can usually brake the bond by sliding a pick up between the hose and nipple and working it around the radius.
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      02-05-2013, 03:26 PM   #7
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I didn't have any luck slipping off the hose, but my friend helped me increase the slack of the hose by unclipping the hose from the coolant tank.

Giving the hose some more slack so that it could stand perpendicular to the vacuum tank seems to have temporarily taken care of the problem. The loud hissing noise is gone when the car is idling.

However, I noticed that the hose still hisses, albeit much less than before, after the car's turned off. I'm going to wait for my indy to come back and check it out further. Thanks again for the help!
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      02-06-2013, 07:33 AM   #8
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Replace the tank, it's cheap
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      02-06-2013, 07:33 AM   #9
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Replace the tank, it's cheap
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      02-06-2013, 02:53 PM   #10
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Quote:
Originally Posted by jpirelli View Post
Replace the tank, it's cheap
Thanks for the tip; yeah, I'll probably do this once my indy gets back from vacation.

What happens to the engine when there's a vacuum leak? Does performance suffer?
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      02-06-2013, 03:49 PM   #11
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Quote:
Originally Posted by E92 M2530Z View Post
Thanks for the tip; yeah, I'll probably do this once my indy gets back from vacation.

What happens to the engine when there's a vacuum leak? Does performance suffer?
Yes. Wastegates won't close -> underboost.
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      02-08-2013, 09:26 PM   #12
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I would just replace that tank, its cheap like posted above.
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