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Thread: 2002 E46 engine knocking.. Please help!

  1. #1
    Join Date
    Mar 2013
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    2002 E46 engine knocking.. Please help!

    The engine is making a knocking sound, i have taken off the intake manifold and replaced all bad rubber hoses and checked boots for leaks. I also replaced the spark plugs with new NGK plugs. I have unplugged the coil packs while it is running and can hear an engine change one each one.

    Here is a link to a video of it:

    https://youtu.be/DNMAV3fLDnY

    I am running out of ideas please help.

    Thanks

  2. #2
    Join Date
    Jan 2016
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    Sounds like it could be low on engine oil, a loose spark plug, almost like an exhaust leak, old school diagnostic for rod knock was to remove the spark plug wire then the plug would not fire. Did it make the noise be fore the spark plug change. You should pull the disa valve and see if it's still in one piece and if it not is the pin that holds the flap in the flap is missing.
    Last edited by jclausen; 04-23-2017 at 01:29 PM.

  3. #3
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    1993 BMW 325i/a
    I did check the DISA and it was not cracked the pin was not missing and the gaskets looked pretty good. The oil could use a change but it is definitely full.

    I found something else that looks possibly bad with the coil wires let me know what you think.

    https://youtu.be/W_Z9zeLt_ww

  4. #4
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    This is nothing to do with coil wires.

    Can you determine WHERE the noise originates? (Front of motor, top of motor, back of motor, or MAYBE THE BELLHOUSING of the transmission?) Is this a manual or automatic transmission car?

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

  5. #5
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    Yes the noise seems to be coming from the rear of the engine. it sounds more like its coming from the bottom half but it is hard to tell. It is an automatic 325xi.

  6. #6
    Join Date
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    With the video and description as my only clues, my wild-assed guess is that the flexplate in the bellhousing is coming apart. Get the car on a lift......

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

  7. #7
    Join Date
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    A loose plug will make a sound eerily like a rod knock but I've never heard it this loud. Still, since the noise is concurrent with a plug change I'd be checking all the plugs are in correctly.
    If nothing found can you post a video of it while you rev it lightly?

    If you can leave two black stripes from the exit of one corner to the braking zone of the next, you have enough horsepower. - Mark Donohue

  8. #8
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    Got it checked out by a euro shop and confirmed it's a bad rod bearing. Thanks for your help guys.

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