Does anyone know what this part is? 2005 1.8T VW Passat

Tiny
STEPHIEO
  • MEMBER
  • 2005 VOLKSWAGEN PASSAT
  • 122,000 MILES
It looks like it has oil possibly coming out of it? I don't think I've noticed this before. I do have a rough idle sometimes when stopped at stop sign or when pull into the driveway after driving. If I turn engine off and back on it will usually return to a regular idle again.
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Sunday, July 15th, 2012 AT 12:19 AM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
It looks like its part of the PCV valve, I might be wrong
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Sunday, July 15th, 2012 AT 12:34 AM
Tiny
STEPHIEO
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  • 3 POSTS
Should it have oil on it like that? I don't think I've ever noticed it before and my husband does not know much about VWs at all :p He thought maybe it had something to do with a vacuum system (i have zero clue what that is either). Other than the odd idle at times, it seems to run pretty smoothly. Just wondering if it's still drive-able until I can get it into a shop? I drive about 60 miles a day (70-80mph) I know I am asking a lot of questions that are hard to answer w/out seeing or hearing the car. Just any general questions/answers you can provide are very helpful :)
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Sunday, July 15th, 2012 AT 12:39 AM
Tiny
RASMATAZ
  • MECHANIC
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Why don't you remove it and bring it in to an auto parts and have them identify it-
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Sunday, July 15th, 2012 AT 12:47 AM
Tiny
EXOVCDS
  • MECHANIC
  • 1,883 POSTS
Yes, that's the PCV valve (see attached image). The diaphragm
is probably broken, which is allowing oil (oil vapor) to exit the
"breather" hole.

If you need a part number let me know.

Thomas
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Sunday, July 15th, 2012 AT 2:21 AM
Tiny
EXOVCDS
  • MECHANIC
  • 1,883 POSTS
You might want to have the whole PCV system checked. There are lots
of other components that are probably in poor shape due to age!

Below are a couple more images. I circled some of the common parts
that break / deteriorate due to oil contamination over the years.

- #2 the main connector at the engine block
- #6a the one-way check valve
- #10 the hose going to the suction jet pump
- #19 (second image) the suction jet pump

Thomas
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Sunday, July 15th, 2012 AT 5:03 PM
Tiny
STEPHIEO
  • MEMBER
  • 3 POSTS
Thanks for all of the info, Thomas! Do you know, is this a relatively easy fix? I probably can't get my car into the shop until Friday or if it's easy enough, my husband can take a look at it. He knows a lot about cars (domestic) but he seems a little weary when it comes to VWs and fixing them. I guess it should be noted that my turbo went out at about 65K Miles, and so maybe the engine had a little more oil issues than it normally would have? I really appreciate all of the help!
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Sunday, July 15th, 2012 AT 10:22 PM
Tiny
EXOVCDS
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The PCV breather at the top of the engine is a straight forward swap. So is the suction jet
pump by the intake manifold.

The hard part is the stuff that is under the intake manifold.

You / he need to do a visual check of all the hoses. Squeeze them to see if any are frail.

We use a smoke machine at the shop that can find broken hoses where eyes & fingers can't get too.

There are too many parts to list and I'm not going to suggest any others, since I don't want you
to buy anything unnecessary.

To put your mind at ease. The engine computer will turn on the check engine light & store a
code that will relate to fuel trim (the amount of fuel correction it has to provide when air hoses
are broken) when things get too far out of specifications.

Thomas
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Monday, July 16th, 2012 AT 12:33 AM

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