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Strange noise....thoughts?

Discussion in 'Technical Q&A' started by jimshadow, May 13, 2009.

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  1. jimshadow

    jimshadow F1 Veteran
    Lifetime Rossa Owner

    Feb 19, 2006
    6,255
    Indiana/North Carolina
    Full Name:
    JIM
    #1 jimshadow, May 13, 2009
    Ok, I have a strange noise coming from the motor. The best way to describe it is that it sounds like a cross between a 'belt chirp' and a 'bearing noise'. It is coming form the uppper part of the motor towards the front side, however, I cannot narrow it down. At first I thought it was my lower drive bearing, but I have had the mechanics stethoscope all over that side of the motor and things sound fine. I've checked my belt covers and they are fine. I've listened with the scope on the cam covers and nothing.

    The noise is random and varies in pitch, but does not increase or change with revs. Sometimes I won't hear it for minutes, then I'll hear it a couple times here and there. I'll try to post an audio file the next time its running, but for now does anyone have any ideas where/what to check next. The car is running top notch at the moment. I dont' have the A/C hooked up at all so its not that and my alt belt is snug as it should be.
    Kind of random I know....

    JIM
     
  2. tatcat

    tatcat F1 World Champ
    Owner Silver Subscribed

    Sep 3, 2001
    11,013
    panama city beach FL
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    rick c
    #2 tatcat, May 13, 2009
    turn up the radio:) i'd say you worry too much but after the things that have happened to you one does wonder. maybe alt pulley grabing the belt or alt bearing? perserverance furthers. keep looking.
     
  3. f308jack

    f308jack F1 Rookie

    Jun 7, 2007
    4,300
    Cape Town, South Afr
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    Jack Verschuur
    #3 f308jack, May 14, 2009
    Before you get too patient locating the source of the noise, make absolutely sure that it is not one of your tensioner bearings.
     
  4. anthonyh

    anthonyh Rookie

    Oct 13, 2008
    29
    #4 anthonyh, May 15, 2009
    Please check the timing belt ideal pooly bearing.
     
  5. jimshadow

    jimshadow F1 Veteran
    Lifetime Rossa Owner

    Feb 19, 2006
    6,255
    Indiana/North Carolina
    Full Name:
    JIM
    #5 jimshadow, May 15, 2009
    The bearings are new. Replaced within the last 500miles. They are functioning properly. I'm 100% sure its not them. :)

    Here is a link to a video taken with my Blackberry. You can hear what i'm talking about at 9/18/19/29/37/41 seconds. I ran for 1.5hrs this am. Did a little 'pre-drive' of the route I'm taking some guys on Sunday for a drive. This is the most I've heard the noise. When I started it up later, I only heard it once or twice in several minutes.....strange I tell ya!

    http://www.youtube.com/watch?v=w6ovW0aCXEs&feature=channel_page

    JIM
     
  6. thecarreaper

    thecarreaper F1 World Champ
    Silver Subscribed

    Sep 30, 2003
    18,109
    Savannah
    #6 thecarreaper, May 16, 2009
    sounds like a plug wire grounding to something on the motor to me. very hard to tell in an audio file.

    otherwise i would say its in the valve train, specifically the buckets and valve springs, but i will let the experts chime in.
     
  7. tajaro

    tajaro Formula Junior

    Mar 22, 2009
    686
    Gulfport Florida
    Full Name:
    Erik V
    #7 tajaro, May 16, 2009
    I had a buddy with a BMW who had over $3,000 of warranty covered work done including a valve-train recondition with the problems (slight stumble just coming off load) remaining... It was finally found to be a spark plug wire! This was all at <40k miles. You'd think something so easy would be obvious to rule out but not in this case. Of course my friend got a free valve job!

    I have no clue what your tick is- but I hope it's something simply once found- good luck and keep us in the loop.
     

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