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Thread: E46 M3 rattle sound. I am stumped what else could it be???

  1. #1
    Join Date
    Mar 2018
    San Diego
    My Cars
    2004 BMW M3

    E46 M3 rattle sound. I am stumped what else could it be???

    Not sure if any of you guys are in but I got this dreaded rattle sound in my M3, at first I thought it was coming from vanos (and listening to it old school screw driver style, not just me but a friend of mine also agreed it does sound like its coming from the vanos listening to it this way but just straight up listening to it he said it sounded like it something from outside is loose). Took off the belts to see if its something accessory driven and the rattle is still there, although the tone of it changed a bit, and the volume is not as loud but still loud rattle sound.

    So initially I thought "Hey probably cam bolts, stop driving the car asap til its done." Well.. a month later I think here I am.. I'll put the list of things I have done so on trying to fix it..

    Beisan seals
    Beisan solenoid pack seals
    Beisan anti-rattle kit
    Cam bolts
    Beisan Upper chain guide
    Chain tensioner
    New belt tensioners
    New water pump

    Only thing vanos related that I haven't touched is the accumulator.

    Here's a video of the rattle..

    Anyone here has any idea what it is? doesn't sound like rod knock to me and to my friends. But at this point I am really stumped on what it is.

  2. #2
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
    Join Date
    Nov 2010
    Hohenfels, Germany
    My Cars
    16 220i 05 325it 05 M3
    So I am going to shoot in the dark here, but did you tighten the 13mm behind the thermostat housing on the timing case? When it gets loose, it will sound like the VANOS rattle.

    It will be #10 here:
    16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
    95 318is Montreal Blue Met (297)/Beige(K1SN) A Hooptie!
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/375k+!
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 motor, such a beater, but great on gas! Best was 38 MPG
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    M-Flight Member

  3. #3
    Join Date
    Mar 2018
    San Diego
    My Cars
    2004 BMW M3
    did not need to loosen that bolt but I will check when I get back on land tomorrow.

  4. #4
    Join Date
    Aug 2007
    My Cars
    190e Benz , Ford Ranger Edge Stepside
    I know it sounds simplistic ...if you have more than 5000 miles on your oil.....try changing it wears ...engine gets noisier.

    Sent from my Nexus 6 using Tapatalk

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