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Thread: Need help! 2004 645Ci engine noise...

  1. #1
    Join Date
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    2013 740LiX, 2004 645Ci

    Need help! 2004 645Ci engine noise...

    Hello,
    Recently bought a 2004 645Ci at auction... it had upper engine noise and some misfiring...took care of that with upper engine clean, oil change, and new spark plugs (looked like low grade oil and 89 fuel had been used...bought from sherrifs dept)

    So anyways, the issue I need help diagnosing is what remained -- a 'chugging' noise, most noticeable at idle and initial acceleration; hardly noticeable over 1500 RPM.
    I posted two video on YouTube for your consideration:

    video 1 is about 18 seconds: https://youtu.be/6nAVQTIvT7Y

    video 2 is about 80 seconds long, and is of engine running at idle then accelerated to 1500 rpm, then idle with a/c on then off: https://youtu.be/bSnzieHReqw

    I removed the fan belt to test if one of the external components...no change (I did not remove the compressor belt).

    Any thoughts or insight to what this might be would be greatly appreciated!

    Thanks!





  2. #2
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    Sounds like a collapsed lifter...
    by watching a video it's tough to tell wether it's top end or bottom end

  3. #3
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    Quote Originally Posted by SlackTube View Post
    Sounds like a collapsed lifter...
    by watching a video it's tough to tell wether it's top end or bottom end

    It sounds, to me, to be coming from lower front...can't tell if left or right...

    thanks .. I'll keep collapsed lifter on my list of possible issues.

    cheers!

  4. #4
    Join Date
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    One more thought for the lower front end is the chain tensioner. Add that to your list...Mine is more towards the back on bank 2. I have replaced all the injectors on engine and 8 lifters on 7 and 8....rear two pistons. Next is the vacuum pump....don't really understand how that works but its another common failure for these engines. good luck

  5. #5
    Join Date
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    See:

    https://www.bimmerforums.com/forum/s...5#post29982135

    By the way, there is a way to puff-up a collapsed lifter which has been a problem since the introduction of the M60 V8 engine:

    http://www.meeknet.co.uk/E38/Tappets.htm

    and more information here:

    http://www.meeknet.co.uk/e31/BMW_M60...ary_Noises.htm
    Last edited by Timm; 03-22-2018 at 06:11 PM.
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


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  6. #6
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    Thanks ugeeks,
    Haven’t had time if late to work on the 645, I’ll probably get back to her next month.
    Will post my success (or failure).
    cheers

  7. #7
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    Hello Timm,
    Thanks for the information and links! I enjoyed the articles - your site is great!
    Am I understanding correctly, if the vacuum pump is the issue I will likely see leakage of oil around the pump housing?
    thanks again, appreciate everyone’s help.
    cheers

  8. #8
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    Thanks! No, the oil leak is an additional 'feature' of the vacuum pump apart from the noise it can make.
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My BMW Repair YouTube Channel
    My Current 840ci Sport Individual
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    Chase - Heroes to a generation

  9. #9
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    Thumbs up

    Quote Originally Posted by Timm View Post
    Thanks! No, the oil leak is an additional 'feature' of the vacuum pump apart from the noise it can make.
    Thanks... I checked the pump this morning for sound, and minimal “rubbing” or “shewshing” sound only...but will work that and the lifters when I get some more time.
    Oh and there is clearly oil coating over the vacuum pump .
    thanks again👍

  10. #10
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    It isn't the pump that makes the noise - it transmits the noise down the camshaft - try removing the blanking cap as seen below when the engine is running, if that makes no difference your vacuum pump worries are over!

    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My BMW Repair YouTube Channel
    My Current 840ci Sport Individual
    My Current 650ci Sport Individual
    My E31 Repair and Information Website
    My E38 Repair and Information Website
    My E63/E64 Repair and Information Website

    Chase - Heroes to a generation

  11. #11
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    ok. Thanks.

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