Intermittent Rattle under car

Discussion in 'Technical' started by Mikezah, Dec 7, 2012.

  1. Mikezah

    Mikezah build thread incoming!

    Hey guys,

    Im experiencing an intermittent rattling noise when I drive the zed.

    it most commonly occurs at low RPM's or when slowing down.. but it has occured sometimes when accelerating from a low speed aswell.

    I find I can make the noise by putting the clutch in and revving the engine and the noise happens breifley when the engine is lowering rpms again.

    Its weird because the gearbox is tight (save for the regular cold slight crunch 1st to second) and the clutch is fine.. im tempted to thing its a bearing gone somewhere but I dont know what to think..


    any ideas?

    - I have changed both engine and gearbox oil with no difference or metallic shavings anywhere

    - it really is intermittent.. some days the car will drive like a million bucks
     
  2. rob260

    rob260 Administrator Staff Member

    Does same noise occur if you rev in neutral? It just with the clutch depressed?
     
  3. Mikezah

    Mikezah build thread incoming!

    Just tried then, sounds great when revving, then there is this mechanical rattle like someone is tapping a screwdriver down on my tailshaft or something... actually more scrapey noise than that..

    thoughts?
     
  4. rob260

    rob260 Administrator Staff Member

    Cats
     
  5. Mikezah

    Mikezah build thread incoming!

    interesting. so from having 2 failed o2 sensors, and faulty cat temp sensors... do you think I have burnt out my cats and hence the rattling noise of stuff inside?
     
  6. onemancrew

    onemancrew New Member

    Could it be a worn out universal joint, similiar to the CV joint click noise?
     
  7. Mikezah

    Mikezah build thread incoming!

    Ive had that before, this is definitley something like a metallic rattle - similar to that of a heatsheild rattling on the exhaust.
     
  8. rob260

    rob260 Administrator Staff Member

    Yes the cats will rattle when they start to break up inside. Give them a gentle tap with a long pole -gentle enough to see if they rattle but not so hard as to cause a rattle...
     
  9. Vader

    Vader Just another guy

    Gravel/small stones stuck between heatshield and car?
     
  10. michgl

    michgl New Member

    its funny rob said that, i had a metal ratal sound last year coming from under the car, took it to my mechanic and they said it could be the cats. Fast fit hit it with a broom or something and located the problem, gave em 600 bucks for 2 new cats , drove off, n the noise was still there. Then one week later after a few drives the noise was gone.
     
  11. ZYTRAM

    ZYTRAM Formerly known as martini_Z

    yeah cats, I had the same thing happen to me!
     
  12. Mikezah

    Mikezah build thread incoming!

    im glad I asked this because I was almost ready to fork out money for gearbox inspection. thanks guys
     

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