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Thread: Engine Noise / Screeching

  1. #1
    Join Date
    Jan 2019
    Location
    Jacksonville, FL
    Posts
    1
    My Cars
    2003 BMW 330ci Convert

    Engine Noise / Screeching

    Hey guys - new member here but really enjoying the community here. So I sprayed some degreaser on my engine and power washed it and now I get a pretty loud screeching noise from the engine - specifically at startup. So tough to tell where it's coming from. I'm pretty handy and ready to roll up my sleeves but not sure where to start. The fan on the front? A pulley somewhere? Any help would be appreciated. Here a YouTube video I took of the symptoms. Start at 4:55.
    It's a 2003 330ci Convertible.


    https://youtu.be/4LlPzM-IxR0?t=297

  2. #2
    Join Date
    Jan 2015
    Location
    Timaru, New Zealand
    Posts
    1,132
    My Cars
    Two Z3 Roadsters
    With a cold engine, try taking one of the belts off in turn and see if the problem disappears. That will tell you if a belt is making the noise. You then need to look at all drives and pullies associated with that belt.

    If you have a mechanical fan, the clutch could be the cause. look at this if the belt removal work does not locate the source.
    1999 2.8L Z3 Roadster,
    2000 3.0L Z3 Roadster,

    There is only one thing more pleasurable than working on a Z3, that's driving it top down on a fine day.

  3. #3
    Join Date
    Sep 2006
    Location
    Michigan
    Posts
    13,674
    My Cars
    2005 325Xi
    If you didn't have the noise prior to spraying degreaser on the engine, I'd guess you got some on the belt(s). Either it didn't get sufficiently cleaned off the belt, or the belt needed replacing anyhow. Wither way, now's a good time to replace both belts and the pulleys if they haven't been done in the past 100k.
    Quote Originally Posted by B4SH View Post
    If anyone knows, it's this guy who knows literally nothing about everything.
    Quote Originally Posted by fcvapor05 View Post
    Do you even OT? The mean 401k around here is probably about $6, what with all the shiny cars and $1,000 watches and donations to get other members' Volvos running.


  4. #4
    Join Date
    Jan 2017
    Location
    USA
    Posts
    284
    My Cars
    E21, E46
    I listened to your video...

    Go to a parts store and get crc belt spray.

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