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Thread: howling noise in engine

  1. #1
    Join Date
    Jan 2013
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    2001 BMW 330ci

    howling noise in engine

    '01 330ci, 140k...just did a cooling system refresh (radiator, expansion tank new hoses, new tranny thermostat) about 1k ago, Waterpump had already been replaced about 10k ago. Alternator was replaced about 6 years ago. Also recently charged the air conditioner. the car has developed a howling noise and it is occasional. when it does happen, you hear it at start-up and til about 20 mph then it goes away. so, I'm thinking either the waterpump, the alternator or the compressor? would appreciate any help... you guys have always been a great resource, and i need a little direction here

  2. #2
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    EXOTICS
    Secondary Air Pump/Auxiliary Air Pump

    Should only operate upon cold start-up,
    for a duration of about 30~90sec.

  3. #3
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    2018 BMW M240i
    Manual or automatic transmission?

  4. #4
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    automatic. was hoping i'd hear from you!....you've help me so much in the past. thx.

  5. #5
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    Quote Originally Posted by MIKYZZ4 View Post
    Secondary Air Pump/Auxiliary Air Pump

    Should only operate upon cold start-up,
    for a duration of about 30~90sec.

    actually, the SAP has been growling for awhile...waiting on that one. But this whine/howl is on the other side of the engine??

  6. #6
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    I would assume the power steering pump.
    Have you checked the reservoir for fluid level?
    Inspected hoses for cuts or leaks at fittings?

  7. #7
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    that's a good bet. I did have to add a good bit of fluid. would a bad PSP make that type of noise? You start checking around at all the possible causes, and you realize just how much maintenience/prevent. is needed on these cars when they head for 150k

  8. #8
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    It does make the noise you described when pump is failing or low on fluid.
    You having to top off fluid is verification of that, hopefully no damage was done.
    Now it's time to find location of leak.

  9. #9
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    2001 BMW 330ci
    Quote Originally Posted by MIKYZZ4 View Post
    It does make the noise you described when pump is failing or low on fluid.
    You having to top off fluid is verification of that, hopefully no damage was done.
    Now it's time to find location of leak.
    Thx:
    thinking about replacing the pump and hoses as preventative maintenance.

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