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Screech after reving engine
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11-26-2018, 09:59 AM | #1 |
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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 |
11-29-2018, 12:48 AM | #2 |
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can you post a video of it?
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11-29-2018, 07:18 AM | #3 |
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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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12-03-2018, 01:25 AM | #4 | |
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Or this?
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12-12-2018, 11:30 PM | #5 |
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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 |
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12-12-2018, 11:35 PM | #7 | |
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12-13-2018, 12:36 AM | #8 |
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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, 10:15 AM | #10 |
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Thanks, will do.
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12-13-2018, 02:56 PM | #11 | |
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12-13-2018, 03:25 PM | #12 |
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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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12-13-2018, 06:14 PM | #13 | |
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12-13-2018, 06:18 PM | #14 | |
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Shouldn't be to bad of an issue if you're not losing that much oil. |
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12-13-2018, 06:29 PM | #15 | |
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Previous: 2011 E90 335i | Black Sapphire Metallic | 2007 E90 335i | Monaco Blue Metallic |
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12-13-2018, 06:45 PM | #16 |
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12-13-2018, 09:17 PM | #17 | |
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12-14-2018, 10:41 AM | #18 |
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Cost Breakdown
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12-14-2018, 04:41 PM | #19 | |
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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. |
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