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Car screeching when I crank it?

Tiny
YELLADUDE901
  • MEMBER
  • 2014 BMW 320I
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 97,700 MILES
Car screeching when I crank it. It stops when I rev it 2 or 3 times. It only does it whenever I crank the car. After Revving it stops. It also stalls when it's screeching.
Wednesday, June 28th, 2023 AT 4:58 PM

8 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response.
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Wednesday, June 28th, 2023 AT 5:43 PM
Tiny
YELLADUDE901
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It sounds like it's coming from where the phone is. When I rev it 3 times it goes away. It only does it when I crank the car and let it run.
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Thursday, June 29th, 2023 AT 6:45 AM
Tiny
KEN L
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Thanks for the video, it helps, it sounds like a vacuum leak or the PCV system has a leak, I would use this guide when the engine is cold only to see if you get a reaction from the spray, this will tell you where the problem is.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Here are some areas to check. Check out the images (below). Please let us know what happens. If you can find a leak, please remove the serpentine belt and start the engine for a few seconds to see if the noise is gone. Let me know what you find.
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Friday, June 30th, 2023 AT 9:47 AM
Tiny
YELLADUDE901
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  • 6 POSTS
How do I find the oil return line?
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Saturday, July 1st, 2023 AT 12:36 PM
Tiny
YELLADUDE901
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  • 6 POSTS
I changed the tensioner, belt and PCV hose, but it stills make a whine. It's like from the middle of the engine.
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Saturday, July 1st, 2023 AT 12:41 PM
Tiny
YELLADUDE901
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  • 6 POSTS
I finally found the noise. It's coming from under the car in the middle.
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Saturday, July 1st, 2023 AT 1:58 PM
Tiny
YELLADUDE901
  • MEMBER
  • 6 POSTS
It's also dripping a lot of water. I believe they coming from the turbos. Because it's dripping from both sides underneath a lot.
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Saturday, July 1st, 2023 AT 3:05 PM
Tiny
KEN L
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Is the noise coming from the turbos? I have seen them go bad and create a whining noise. If the turbos are bad here is how to change them out. Check out the images (below). Please let us know how it goes.
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Monday, July 3rd, 2023 AT 12:19 PM

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