355 noise/rattle at 3000 rpm | FerrariChat
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355 noise/rattle at 3000 rpm

Discussion in 'Technical Q&A' started by jrs, May 2, 2004.

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  1. jrs

    jrs Formula 3

    Jun 14, 2003
    1,672
    UK
    Full Name:
    James S
    #1 jrs, May 2, 2004
    My car (95 gts) has developed a bad noise at 3000 rpm. It sounds like a something is loose around the engine when you are running at 3000 rpm. You can be accelerating or slowing down but as you pass through 3000 you get this noise. If you stay at constant 3000 then the noise is there. Sounds like a loud vibration. Car is pulling great and shows no lights ets. It it Tubi and de-cat.

    Any ideas appreciated

    James
     
  2. tbakowsky

    tbakowsky Two Time F1 World Champ
    Consultant Professional Ferrari Technician

    Sep 18, 2002
    20,034
    The Cold North
    Full Name:
    Tom
    #2 tbakowsky, May 2, 2004
    Check to make sure that the diffuser panels under the car are still tight. These thing can rattle up a storm if they lose a bolt espeacialy the ones just under the lip of the bumper. Also in behined the bumber is a heat sheild. This heat sheild has lower attaching points on the lower lip of the bumper. Check to be sure that the heat shield has not broken away from it's mounts (common) and rattleing around against the muffler.

    Tom
     
  3. Tipo815

    Tipo815 F1 Rookie

    Nov 1, 2003
    3,565
    Newport Beach, CA
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    Jeffrey
    #3 Tipo815, May 2, 2004
    James - I concur with Tom. The harmonic vibration sounds are from loose heat shields or panels. They only create that vibrating/rattling sound at certain rpms. You just need to spend the time to check all the panels to tighten things.
     
  4. richard_wallace

    richard_wallace Formula 3

    Feb 6, 2004
    1,957
    Cincinnati, Ohio
    Full Name:
    Richard Wallace
    #4 richard_wallace, May 2, 2004
    Tom/others - could it be the exhaust bypass valve - don't they start to rattle at lower RPM when it starts to go? Which would sound like it is coming just under the heat shield area....

    Just another thought...
     
  5. ferraridriver

    ferraridriver F1 Rookie

    Aug 8, 2002
    4,152
    Bay Area Calif.
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    Dave
    #5 ferraridriver, May 2, 2004
    Check the charcoal cannister in the left rear fender, Mine was loose, it was addressed here before. Its an easy fix, just a little pading under the straps.
     
  6. tbakowsky

    tbakowsky Two Time F1 World Champ
    Consultant Professional Ferrari Technician

    Sep 18, 2002
    20,034
    The Cold North
    Full Name:
    Tom
    #6 tbakowsky, May 2, 2004
    Good catch..I forgot all about those pesky valves!!
     
  7. jrs

    jrs Formula 3

    Jun 14, 2003
    1,672
    UK
    Full Name:
    James S
    #7 jrs, May 3, 2004
    Will check out all the areas advised today

    rgds
    J
     

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