Materials to Maintain Your ZHP IIIII Hand Protection IIIII Tools to Maintain Your ZHP
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  1. #1

    Humming whirring noise from engine bay (especially upon start up)

    Mine is a 2004 ZHP manual transmission w/ 95k miles

    I recently noticed a higher-pitched humming (whirring) noise from the engine bay, especially at start-up. My searches came up with a possible idler pulley, but I wanted to ask for your thoughts here. It sounds like a jet engine taking off from the cabin when I start the car.

    Here is a video with sound of my issue:

  2. #2
    Join Date
    Jan 1970
    Lexington, KY
    idler pulley? belt? when were they last changed?
    325i, 2005, 5MT, Silvergrey, leatherette, Sport package; CDV delete, KONI STR-T & KYB Excel-G, Weisslichts, Stewart H2O pump

    328i, 2010, 6MT, Spacegrey, dakota leather, M-sport packages; has a 330 intake but no tune - yet][IMG]

  3. #3
    Actually, my issue seems to be the alternator itself!

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