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Old 04-18-2015, 08:19 PM   #1
VirtuallyWorthless
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2011 GTI Squealing sound - not water pump

***********UPDATE: as suggested, it was the PCV separator (part bolted on top of valve cover) that was faulty and making that sound. Replaced it, sound gone and idle is smooth again.


Hey everybody, I could use a hand on what you may think this lovely sound is:

https://youtu.be/grVkJYJWZg4

Started yesterday as my fiancee was almost home. I initially thought it was the water pump, but replacing that did not affect it. Sound does not happen until engine reaches operating temperature. Yes there is oil in it.

120,000 miles.

Thanks in advance.
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Last edited by VirtuallyWorthless; 04-27-2015 at 10:55 AM. Reason: Update because fixed
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Old 04-18-2015, 08:23 PM   #2
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Also the sound remains even with the accessory belt removed, so I do not believe it to be coming from there.
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Old 04-18-2015, 09:22 PM   #3
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Additional notes: giving any throttle at all makes the sound go away, it seems to only happen at idle.

Idle is jumpy / rough - like a vacuum/boost leak. Worse before engine is up to temp. I double checked everything I took apart to change the water pump and everything appears snug. However at least two of the bolts that hold the intake manifold on to the head are loose and will not tighten - right as they feel like they are about to get snug they become loose again. Apparently when I changed my intake manifold 20,000 miles ago I damaged the threads? Is it possible this sound is being caused by the intake manifold not being tight, or do I just have two problems to worry about now?
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Old 04-19-2015, 10:51 PM   #4
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Originally Posted by VirtuallyWorthless View Post
Additional notes: giving any throttle at all makes the sound go away, it seems to only happen at idle.

Idle is jumpy / rough - like a vacuum/boost leak. Worse before engine is up to temp. I double checked everything I took apart to change the water pump and everything appears snug. However at least two of the bolts that hold the intake manifold on to the head are loose and will not tighten - right as they feel like they are about to get snug they become loose again. Apparently when I changed my intake manifold 20,000 miles ago I damaged the threads? Is it possible this sound is being caused by the intake manifold not being tight, or do I just have two problems to worry about now?
I had a sound somewhat like that when my PCV valve went bad.
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Old 04-19-2015, 10:56 PM   #5
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Had the same thing the first and only winter I drove my car, seems to go away when warmer. Not too sure how cold it is where you are but that may be a factor.
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Old 04-20-2015, 09:46 AM   #6
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I had a sound somewhat like that when my PCV valve went bad.
Interesting, I will have to look into that. There was a excessive amount of oil in the intake piping (way more than previous times I had them off) so I wouldn't be surprised if the PCV valve is shot.
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Old 04-20-2015, 09:48 AM   #7
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Had the same thing the first and only winter I drove my car, seems to go away when warmer. Not too sure how cold it is where you are but that may be a factor.
Hmmm, was fine all winter well below freezing, and when it started on Friday it was in the 60s or 70s.
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Old 04-20-2015, 10:55 AM   #8
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Interesting, im curious to know what i ends up being!
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Old 04-20-2015, 01:26 PM   #9
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belt ? im not sure.
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Old 04-24-2015, 12:49 PM   #10
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Quote:
Originally Posted by VirtuallyWorthless View Post
Hey everybody, I could use a hand on what you may think this lovely sound is:

https://youtu.be/grVkJYJWZg4

Started yesterday as my fiancee was almost home. I initially thought it was the water pump, but replacing that did not affect it. Sound does not happen until engine reaches operating temperature. Yes there is oil in it.

120,000 miles.

Thanks in advance.

That's the PCV valve going bad, sounds like a loud squealing belt
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Old 04-24-2015, 01:50 PM   #11
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That's the PCV valve going bad, sounds like a loud squealing belt
Second vote for PCV. Part is supposed to show up in the mail today from 1stvwparts.com. Here's hoping I'll be all fixed up soon.
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Old 04-26-2015, 02:04 PM   #12
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Replaced PCV - or "seperator" as VW names the part - sound is gone, idle is normal, all seems well.

Thanks loopless and Calkulin.
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