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  #1  
Old 12-16-2017, 11:44 PM
gillzj00 gillzj00 is offline
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Mein Auto: 2011 X5 35i Premium
High Pitched whining from engine compartment

2011 X5 35i with 84k miles.

I just pulled into my garage after a 20 mile highway drive and there is a loud, high pitched whining noise coming from my engine bay. I will investigate it more tomorrow but I am wondering if there are common issues anyone is aware of.

It sounds like it could be a bearing somewhere that contact the serpentine belt. The sound seems to be coming from almost under the engine.

There's no lights on the dash. I will hook up my laptop tomorrow and do a scan for faults.

Thanks for any thoughts!
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  #2  
Old 12-17-2017, 12:46 PM
gillzj00 gillzj00 is offline
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Video

Here is a video of the sound last night:



This morning I took it for a drive and no crazy screaching. The accessory belt or whatever BMW calls it isn't very accessible without removing the radiator fan but through some cracks I can see the belt tensioner. When the vehicle is idling it seems to be shaking back and forth a mm or 2 each way rather rapidly. I don't know if that is indicative of a failing tensioner or if it's just doing it's job as the belt tension fluctuates.

Any thoughts would be appreciated.

Thanks!
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  #3  
Old 12-17-2017, 05:03 PM
SoCaLE39 SoCaLE39 is offline
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Sounds like a failing bearing to me and your at around the mileage these things start to fail. You could try pulling the dust caps off and spraying a little WD40 on the bearing while moving to see if the noise changes.
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  #4  
Old 12-17-2017, 06:14 PM
gillzj00 gillzj00 is offline
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Hmmm

Thanks for the response SoCal. I just came across this link and it's a bit concerning:

http://www.e90post.com/forums/showthread.php?t=1197666

The link mentions a CCV going out and causing excessive vaccuum in the engine causing the rear main seal to leak and thus sounding like this:




My car sounded identical to that. I wonder if anyone on here has experienced something similar?
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  #5  
Old 12-18-2017, 07:11 AM
rpoitras rpoitras is offline
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Mein Auto: 2010 BMW X5 3.0si
Open the oil filler cap while the engine is idling. If it's really hard to open (high crankcase vacuum) then you probably do have CCV issues. The sound would also go away while the cap is open. Simple test. Let us know!
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  #6  
Old 12-18-2017, 08:28 AM
gillzj00 gillzj00 is offline
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I will let you guys know. Unfortunately, or maybe fortunately lol, the sound has only happened once and at the time I didn't think to open the oil cap.

Tonight I am probably going to try to generate some smoke in front of the PCV and see if it is sucking it in consistently, if so I read that was an indication of a leak.

From what I was reading, if this is the issue, a new valve cover should fix the vacuum problem and hopefully the main seals were not damaged to the point of needing replacement.

If I can confirm it is a vacuum issue I think I am going to attempt to dremel off the PCV and replace the diaphragm with the kit for $50 rather than replace the whole cover. The covers are expensive and I'd like to save myself the time if possible.
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Old 12-19-2017, 05:44 PM
gillzj00 gillzj00 is offline
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A little update.

Used Carly to pull codes. 2 codes found:


28A0 - Throttle valve opening angle-intake pipe absolute pressure, comparision pressure too high

2775 - Air mass plasibility: air mass too low.
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  #8  
Old 01-19-2019, 11:56 AM
petr4271 petr4271 is offline
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Mein Auto: BMW f10 2012 535iX
Here is how to fix it and what to look for.

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