Screech after reving engine

FinallyABimmer · 11-26-2018, 09:59 AM

My 2011 335i (N55) makes a screeching sound after I rev the throttle. It makes the sound after the engine returns to idle. I was hoping it just was a belt.

Any thoughts or have others encountered this?

Thanks

MartinWake · 11-29-2018, 12:48 AM

can you post a video of it?

Pladi · 11-29-2018, 07:18 AM

could be pullies/belt or depending on the noise the front main seal due to pad pcv valve. Could also be bearing of the AC compressor..

lucasmiller2015 · 12-03-2018, 01:25 AM

Quote:

Originally Posted by FinallyABimmer

My 2011 335i (N55) makes a screeching sound after I rev the throttle. It makes the sound after the engine returns to idle. I was hoping it just was a belt.

Any thoughts or have others encountered this?

Thanks

Does it sound like this:

Or this?

FinallyABimmer · 12-12-2018, 11:30 PM

Linked below is a video of me revving the engine and when the car returns to idle, it makes a squeaking/screeching/chirping sound. It only happens as the engine returns to idle speed, lasting a few seconds.

I took the car into the dealership to diagnose AND get this-

As I was walking past a F30 335i, it made the SAME SOUND!! The service rep caught it too.

I will let you all know what they report but please let me know your thoughts.

http://www.youtube.com/watch?v=VFeyM...ature=youtu.be

FinallyABimmer · 12-12-2018, 11:32 PM

Hi, I posted a video of the sound.

http://www.youtube.com/watch?v=VFeyM...ature=youtu.be

Mackie_ · 12-12-2018, 11:35 PM

Quote:

Originally Posted by FinallyABimmer

Hi, I posted a video of the sound.

http://www.youtube.com/watch?v=VFeyMusBNy0&feature=youtu.be

following

FinallyABimmer · 12-13-2018, 12:36 AM

According to similar cases I found on youtube, it could be a bad PCV valve OR a vacuum leak in the rear seal. 6 months ago I replaced a valve cover after getting smoke from the engine. Hmmm.

This guy replaced the pcv valve himself...

https://www.youtube.com/watch?v=WqoNtu7QHyw

And in the comments in this video, someone suggested a vacuum leak in the rear seal...

https://www.youtube.com/watch?v=mn8T3u9utAE

I should have got the 328i...

weehe126 · 12-13-2018, 04:07 AM

Do the PCV test, see if it is pulling air into the nipple on the top of the VC.

FinallyABimmer · 12-13-2018, 10:15 AM

Thanks, will do.

katatonia · 12-13-2018, 02:56 PM

Quote:

Originally Posted by FinallyABimmer

Hi, I posted a video of the sound.

http://www.youtube.com/watch?v=VFeyM...ature=youtu.be

If I'm hearing it correctly, my car's been making that sound forever. At idle it's like a slight ticking noise? Every mechanic I've bothered about it tells me it's normal. Is the sound any different when cold? In my case it goes away after a couple minutes driving.

FinallyABimmer · 12-13-2018, 03:25 PM

The verdict is in: Leak in rear seal. About $3000 at dealership.

No wonder the Germans couldn't defeat the Russians on the battlefield- all their tanks were in the shop!

Thanks for everybody's' help.

https://www.e90post.com/forums/image...es/mad0260.gif

Pladi · 12-13-2018, 06:14 PM

Quote:

Originally Posted by FinallyABimmer

The verdict is in: Leak in rear seal. About $3000 at dealership.

No wonder the Germans couldn't defeat the Russians on the battlefield- all their tanks were in the shop!

Thanks for everybody's' help.

https://www.e90post.com/forums/image...es/mad0260.gif

3500 you can get an entire used engine.

TheMidnightNarwhal · 12-13-2018, 06:18 PM

Quote:

Originally Posted by FinallyABimmer

The verdict is in: Leak in rear seal. About $3000 at dealership.

No wonder the Germans couldn't defeat the Russians on the battlefield- all their tanks were in the shop!

Thanks for everybody's' help.

https://www.e90post.com/forums/image...es/mad0260.gif

Damn and you have a 2011? How many miles.

Shouldn't be to bad of an issue if you're not losing that much oil.

lucasmiller2015 · 12-13-2018, 06:29 PM

Quote:

Originally Posted by FinallyABimmer

The verdict is in: Leak in rear seal. About $3000 at dealership.

No wonder the Germans couldn't defeat the Russians on the battlefield- all their tanks were in the shop!

Thanks for everybody's' help.

https://www.e90post.com/forums/image...es/mad0260.gif

Any idea how this breaks down in terms of part cost vs labor cost?

Pladi · 12-13-2018, 06:45 PM

Quote:

Originally Posted by lucasmiller2015

Any idea how this breaks down in terms of part cost vs labor cost?

the part is 20 bucks..

vespa · 12-13-2018, 09:17 PM

Quote:

Originally Posted by FinallyABimmer

The verdict is in: Leak in rear seal. About $3000 at dealership.

No wonder the Germans couldn't defeat the Russians on the battlefield- all their tanks were in the shop!

Thanks for everybody's' help.

Relax, your dealer is just unfamiliar with how cars work. You just need a valve cover which is a $400 part and less than 3 hours of labor. Any shop can do it or follow the DIY here.

FinallyABimmer · 12-14-2018, 10:41 AM

Quote:

Originally Posted by lucasmiller2015

Any idea how this breaks down in terms of part cost vs labor cost?

$2700 Labor

$300 part

Not sure if prices vary by dealership.

FinallyABimmer · 12-14-2018, 04:41 PM

Quote:

Originally Posted by vespa

Relax, your dealer is just unfamiliar with how cars work. You just need a valve cover which is a $400 part and less than 3 hours of labor. Any shop can do it or follow the DIY here.

Thanks for the info. I read your N55 Valve Cover Thread which was very informative but this is a little out of my skill-set.

I am planning to do the oil cap test but is their any DYI instructions for a smoke test? I searched and found different cars getting tested. (stupid question- does the part need to be removed or will the smoke be drawn in with the engine running. As you can see, I am clueless.

weehe126 · 12-14-2018, 07:44 PM

The smoke test is to see if air is being pulled into the plastic nipple on top of the VC I mentioned above.

11-26-2018, 09:59 AM	#1
FinallyABimmer New Member 2 Rep 9 Posts Drives: 2011 335i Join Date: Oct 2014 Location: Southern California iTrader: (0) Garage List 2011 BMW 335i Sedan [0.00]	Screech after reving engine My 2011 335i (N55) makes a screeching sound after I rev the throttle. It makes the sound after the engine returns to idle. I was hoping it just was a belt. Any thoughts or have others encountered this? Thanks
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11-29-2018, 12:48 AM	#2
MartinWake Lieutenant 80 Rep 414 Posts Drives: CL55 AMG Join Date: Nov 2018 Location: Miami iTrader: (1) Garage List 2011 BMW 335i [0.00] 2016 BMW 320i [0.00]	can you post a video of it?
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11-29-2018, 07:18 AM	#3
Pladi Lieutenant Colonel 718 Rep 1,753 Posts Drives: 2011 335i xdrive Join Date: Nov 2017 Location: Waterloo, ON Canada iTrader: (0)	could be pullies/belt or depending on the noise the front main seal due to pad pcv valve. Could also be bearing of the AC compressor..
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12-12-2018, 11:30 PM	#5
FinallyABimmer New Member 2 Rep 9 Posts Drives: 2011 335i Join Date: Oct 2014 Location: Southern California iTrader: (0) Garage List 2011 BMW 335i Sedan [0.00]	Here is a link to the squeak/schreech Linked below is a video of me revving the engine and *when the car returns to idle, it makes a squeaking/screeching/chirping sound. It only happens as the engine returns to idle speed, lasting a few seconds. I took the car into the dealership to diagnose AND get this- As I was walking past a F30 335i, it made the SAME SOUND!!* The service rep caught it too. I will let you all know what they report but please let me know your thoughts. http://www.youtube.com/watch?v=VFeyM...ature=youtu.be
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12-12-2018, 11:32 PM	#6
FinallyABimmer New Member 2 Rep 9 Posts Drives: 2011 335i Join Date: Oct 2014 Location: Southern California iTrader: (0) Garage List 2011 BMW 335i Sedan [0.00]	Hi, I posted a video of the sound. http://www.youtube.com/watch?v=VFeyM...ature=youtu.be
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12-13-2018, 12:36 AM	#8
FinallyABimmer New Member 2 Rep 9 Posts Drives: 2011 335i Join Date: Oct 2014 Location: Southern California iTrader: (0) Garage List 2011 BMW 335i Sedan [0.00]	Oh crap, I might have... According to similar cases I found on youtube, it could be a bad PCV valve OR a vacuum leak in the rear seal. 6 months ago I replaced a valve cover after getting smoke from the engine. Hmmm. This guy replaced the pcv valve himself... https://www.youtube.com/watch?v=WqoNtu7QHyw And in the comments in this video, someone suggested a vacuum leak in the rear seal... https://www.youtube.com/watch?v=mn8T3u9utAE I should have got the 328i...
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12-13-2018, 04:07 AM	#9
weehe126 Brigadier General 1161 Rep 3,185 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	Do the PCV test, see if it is pulling air into the nipple on the top of the VC.
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12-13-2018, 10:15 AM	#10
FinallyABimmer New Member 2 Rep 9 Posts Drives: 2011 335i Join Date: Oct 2014 Location: Southern California iTrader: (0) Garage List 2011 BMW 335i Sedan [0.00]	Thanks, will do.
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12-13-2018, 03:25 PM	#12
FinallyABimmer New Member 2 Rep 9 Posts Drives: 2011 335i Join Date: Oct 2014 Location: Southern California iTrader: (0) Garage List 2011 BMW 335i Sedan [0.00]	The verdict is in: Leak in rear seal. About $3000 at dealership. No wonder the Germans couldn't defeat the Russians on the battlefield- all their tanks were in the shop! Thanks for everybody's' help. https://www.e90post.com/forums/image...es/mad0260.gif
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12-14-2018, 07:44 PM	#20
weehe126 Brigadier General 1161 Rep 3,185 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	The smoke test is to see if air is being pulled into the plastic nipple on top of the VC I mentioned above.
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