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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY: Understanding the N55 PCV Valve of Doom



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      05-28-2018, 06:55 AM   #23
jnrz78
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Thumbs up BMW e90 N55 engine whirring noise

HI,

I knew to this forum and seems like there is a lot of deep knowledge here and wondering if anyone can help me out.

I also have some sort of chirping/ringing/whirring noise coming from near the PCV area. The car has now done 50,000KM and it is a 2011 n55 335i model.

I performed a quick test as described for the water test. There wasn't any bubbles at low revs, however, when I hit the throttle, I can see the water being sucked in/out.
Can this also be a dead PCV issue? The noise is really doing my head in!

I have also recently done a full engine oil flush, replacing the oil filter. I have also recently changed the boost solenoid which hasn't resolved the issue.

Any help would be much appreciated..

Here are some videos of the noise from the engine:

https://www.youtube.com/watch?v=KgVW...ature=youtu.be

https://www.youtube.com/watch?v=eND7...ature=youtu.be

ttps://www.youtube.com/watch?v=48om...ature=youtu.be
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      06-23-2018, 12:36 AM   #24
tcabill
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THANKS!!!!!

Your write up was great. My car was doing this weird boost osilation and on logs the throttle was going up and down kinda like a heartbeat. I'm running MHD map 2+ for E30 but when I flashed back to stock it wasn't as noticable but the logs still showed it, just not as extreem. I did have the squeal from the rear main seal but I didn't know what it was till I stumbled on this post. Got my new valve cover on a few hours ago and she's back. Boost is nice and steady and hitting 20 psi again. Thanks for posting your findings.
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      06-27-2018, 04:45 AM   #25
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Quote:
Originally Posted by remixsecret View Post
I did this hacked job with the PCV valve replacement part off vanos website. Squeal is still there but less now, but else could be the issue to fully get rid of the howling sound?
What did you end up doing to fix it. I replaced but the squeal is still there.
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      01-03-2019, 10:47 AM   #26
gillzj00
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As I have been kind of active on this thread I want to make an update:

The squealing from the rear main came back strong about a year after I noticed it. It would squeal non-stop every time I drove. I replaced the PCV using the write-up provided in earlier posts. The sound went away for a couple months. The sound came back but is more sporadic now. I ordered a new valve cover from FCP Euro and plan on doing the job this weekend. I am hoping a new cover in it's entirety will finally fix this issue semi-permanently.

I will try to update this post a few months from now to confirm/deny that the valve cover (OE) fixed the issue.
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      01-12-2019, 11:47 PM   #27
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Here is also video with explanation ,doesn't seems to be that hard to change PCV valve itself.


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      03-24-2019, 02:00 PM   #28
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Im getting ready to replace the Valve Cover Gasket on 13 335i n55. 65k miles, probably makes sense to replace the PCV at the same time/as preventative.

Im wondering if it is possible to replace the diaphragm only without cutting the PCV off the top of the valve cover?

And just to be crisp, is this the only part needed?

n55 eBay

THANK YOU!

Last edited by Scuttles; 03-24-2019 at 02:08 PM..
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      03-24-2019, 04:24 PM   #29
vespa
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The diaphragm is sealed inside a compartment so you'd still have to cut it apart and glue the replacement part back on. One big advantage to doing it with the cover off is that you will have a much better chance of keeping the plastic shavings out of the engine.

But it's still quite a hack, quite a bit of added effort, and you risk breaking something on the VC in the process, screwing up the new valve, or getting dirt, plastic, or glue clumps in there along the way. It's even possible that your oil leak is thru a crack in the cover rather than the gasket. It's so much work to remove the valve cover, I'd strongly suggest spending the extra $300 to replace the whole cover. It comes with bolts and gaskets and you know it will work perfectly.
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      11-07-2019, 04:07 PM   #30
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does is cause boost leak?
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      11-07-2019, 09:40 PM   #31
vespa
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No. Crankcase pressure and boost pressure are unrelated.
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