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Strange new M20 Sound

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    #1

    Strange new M20 Sound

    Hi All,
    I'm in the process of getting my e30 as reliable as possible before heading off to medical school in the fall. I've been squaring away things like the brakes, suspension and basic engine tune up, belts ect. Very recently the motor started making two new sounds. One I think I've narrowed down to the timing belt rubbing against it's cover. It sounds exactly like this video posted by Earendil, which turned out to be just that. https://www.youtube.com/watch?v=EBYZMv4WYFo I've ordered new parts, and will be swapping them this week thanks to several great DIY's.

    In addition, around the same time the motor began making a strange new rattling sound from deeper inside the engine at idle. It's hard to pinpoint where it's coming from, but it's definitely not the valves. I was hoping that if you guys listen to a quick video it might sound familiar. In the video it seems to be most easily heard around the 6 second mark. Anyway, without further ado, here's the link. https://www.youtube.com/watch?v=mt8n...ature=youtu.be

    Thanks in advance for any help you guys can offer.
    Cheers - Brian
    Still waiting for a 2dr Calypso to come up to the auction block, PM me if you know of any
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    #2
    Wish I could be of more help, but I suggest the backyard quick cylinder test.

    Take a wooden pole (stick won't do), put your thumb over the rounded edge of it. Take the end you unscrewed from whatever tool it was attached to, and place it on the motor. Start with the cylinders up top by the head, while the car is running (never do this near moving fans, belts, etc.) Go one by one until you hear the source, or at least general area of your problem. Think of it as a stethoscope to a doctor, a crude one though it may be.

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      #3
      Sounds like water pump. May possibly be the tensioner as well. Either way youbshould replace the pump. I almost garauntee thats what that is.

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        #4
        Great! Thanks for the advice guys. When it stops raining here in NY I'll give the stethoscope a try. I ordered a new water pump to replace while I was in there, so hopefully that does the trick. Thanks again!
        Still waiting for a 2dr Calypso to come up to the auction block, PM me if you know of any

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          #5
          It looked and sounded like your fan was hitting one of your radiator hoses.. I could be very wrong haha but I would check! Might be as simple as that if it happened randomly..


          Sent from my iPhone using Tapatalk

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            #6
            My car is making the same noise as the 2nd video. I'm in the process of narrowing down the sound as well. I think it is the water pump as well, or one of the pulleys. About to do them all!

            Any luck with your's before I tear apart the whole front end?
            1987 E30 325is (5-Speed)
            2006 E83 X3 M-Sport (Slush)
            2010 E90 328 X-Drive MSport (Slush)

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