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  1. #1
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    Member No: 85497 kdane is an unknown quantity at this point kdane's Avatar
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    Thumping/Plulley type noise

    I have a 1997 e36 M3 4 door with 112,000 miles and a previously subtle noise has turned into a worrying one. Ive posted a video at

    http://www.mashaandkris.com/MOV01625.MPG

    I apologise that it takes so long to download (it's 18.1 MB) but I couldn't figure out how to compress it.

    The water pump has been replaced with a metal impeller version...I have used the rigid-stick to alternator/waterpump/power steering pump test to try to locate the noise but I haven't been able to figure out what is making the noise.

    Any ideas?


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    Does it increase with the revs?


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    Re: Does it increase with the revs?

    Yes it does...as the revs increase the "thumping" increases in frequency.

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    pull the cover, and coils, check sparkplug seating

    It almost sounds like a plug is loose and the cylinder is not firing and leaking.... or worse a connector rod.

    Plugs have been known to loosen. You could prolly just check the first two.

    Hopefully it is something simple like that.

    You need an oilservice... :)_______
    GC RTAB shims, RSMs, T/S Coilover with Koni DA f/SA R & 450#f/550#r Eibach ERS
    Eyeball Arm CA mounts
    Sunbelt CAMS w chip for 24# injectors, Euro MAF, Conforti/ITG CAI
    96+ exhaust manifolds
    Euro fLoAtErS, Ferodo DS2500
    accessory UDPs
    M roadster lever
    All done in my garage

    corkscrew:Laguna Seca

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