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  • Engine Knock

    Need some help.

    Got the car back from the mechanic and its got a couple of new noises? When driving and the engines cold it makes a whine/rattle noise. Its very faint and it stops once you touch the throttle. Only starts when your going 20 mph and over.
    Theres also a constant knock when the engine is at idle. More when the engine is hot. Open the bonnet and you can here it clearly. When you rev it gets slightly faster.

    Anyway I can attach a video? I have a video of the knock.
    2000 Z3M coupe, Titansilber Silver with Kyalami/Black seats
    2001 e39 540i, Topaz Blue
    1971 2002tii, Bristol Grey

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    2013 M135i

  • #2
    Heres a link to the video.

    https://youtu.be/1Aro3ePKx0g
    2000 Z3M coupe, Titansilber Silver with Kyalami/Black seats
    2001 e39 540i, Topaz Blue
    1971 2002tii, Bristol Grey

    Previous

    2013 M135i

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    • #3
      What work did you have done by the mechanic Chris?
      Not actually in the least bit fat

      2000 S50 Titanium Silver / Black
      ACS Suspension, Exhaust & Type III Wheels
      Simota carbon air intake | Strong Strut Front Brace

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      • #4
        The mechanic fitted a new rocket cover and plenum chamber. Would this be the reason. Would this affect the Vanos seal perhaps?

        The car was fitted with a rebuilt vanos in the past from MrVanos.com. So the Vanos itself shouldn't be broke?

        The mechanic also fitted new gear shifter and a few other things, but the rocker cover was the only engine related thing.
        2000 Z3M coupe, Titansilber Silver with Kyalami/Black seats
        2001 e39 540i, Topaz Blue
        1971 2002tii, Bristol Grey

        Previous

        2013 M135i

        Comment


        • #5
          Did you replace the rocker cover gasket seal and the 16 (approximate) rubber heads as well as the rocker cover itself?

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          • #6
            That sounds like a worn vanos to me. Stacey's roadster had a similar noise before Mr Vanos did his work

            They come with a 2 year warranty from Mr Vanos so I'd get in touch and send the link to the video

            When I saw him he mentioned that he had revised his process c. 2011 to improve it

            Build thread: https://www.z3mcoupe.com/forum/showthread.php?t=19347

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            • #7
              Does sound like vanos - was the oil changed at all? Sometimes it pumps back up and the noise seems to go away. I recall mine used to growl on overun when I got it back in 2005 but doesn't seem to do it now as much.

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              • #8
                Thanks for your help. The mechanic is due to ring me back. And I’ve emailed Mr Vanos with a link to the video.
                How much is a rebuilt Vanos?
                2000 Z3M coupe, Titansilber Silver with Kyalami/Black seats
                2001 e39 540i, Topaz Blue
                1971 2002tii, Bristol Grey

                Previous

                2013 M135i

                Comment

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