[watchout-everyone]

Please watch your ear: https://streamable.com/ekszbh

Hello, I am working on my car and above is the sound that's currently being made (replaced several gaskets, coolant hoses, air filter,).

I started my car in awhile after replacing the parts and hearing this high-pitched sound, and i am having hard time identifying what the problem is. Worst thing is i don't even know if the noise was there prior to me changing all the problem the car came with. Just fyi, I don't see any 'Check Engine Light' either.

Does anyone know if the sound of the engine is completely normal? Although it's facing OFH for random reasons, i don't think it's from there but it does sound like it's on the left side of the car.

Edit: I found the car is using some LED bulb for the fog light (which I think it's broken now judging by how it blinks initially just to die), maybe that's the issue? I am changing it back to the regular Halogen bulb tomm but any confirmatino will be great if such can affect the sound. Just fyi, the bulb is sale for like only $6 each on Amazon so very nice deal! Philips 12360B1 H8 Standard Halogen Replacement Headlight Bulb, 1 Pack

[watchout-everyone]

Oh someone said high pitched sound is usually air filter or sensor related.

I just checked and bottom of the air filter wasn't fully inserted in. Will fix tomm and will keep updated likely tomm.

[mainbearing]

That sounds like some kind of bearing or rotating pulley kind of noise. A vacuum leak would be more steady and higher pitch I think.

[watchout-everyone]

Originally Posted by mainbearing

That sounds like some kind of bearing or rotating pulley kind of noise. A vacuum leak would be more steady and higher pitch I think.

Thanks for the note mainbearing. I will try to check again in the sun and see if i can better visuals and notice something unusual

[Mike K]

I hope it’s not this:

https://www.e90post.com/forums/showt...ight=whistling

Thats what it was for my 2011 328i. If it is for yours too, this is now a Vanos bolts recall item so run your vin at the BMW recall site.

[watchout-everyone]

Originally Posted by Mike K

I hope it’s not this:

https://www.e90post.com/forums/showt...ight=whistling

Thats what it was for my 2011 328i. If it is for yours too, this is now a Vanos bolts recall item so run your vin at the BMW recall site.

Hello, i heard about the recent Vanos recall but i don't see my car listed surprisingly.

However, i did find this recall outstanding... Are they related or similar thing?

[Mike K]

I hear tell that some n52 Vanos units were repaired under a 10 year warranty extension from BMW and that there would then be a green sticker inside the door jamb.

The PVC recall thing adds a fuse. I’d take care of that to avoid fire possibilities...

[watchout-everyone]

Hello - just updating those who might come into same problem

My issue was either loosen oil filter and/or air filter. I took out both to replace and i guess i didn't put them in tight. For air filter, bottom was very loosely fitted/pushed in from an awakrd angle