355 Back fire and running like 7.5 cylinders | FerrariChat
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355 Back fire and running like 7.5 cylinders

Discussion in '348/355' started by Pengster355, Jul 7, 2010.

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  1. Pengster355

    Pengster355 Formula Junior

    Mar 9, 2006
    269
    Singapore
    Full Name:
    Peng Malakul
    #1 Pengster355, Jul 7, 2010
    Hi guys,

    Before Im sending her in, I would like to check with gurus here first. She is running okay but feels like its only 7.5 cylinders and lots of back fires when I lift or cruising at low revs. there is no lights coming on, no cats for me and the manifolds have just been changed.

    so any guidance will be great, thanks a lot

    Cheers
    Pengster
     
  2. F355Bob

    F355Bob Formula 3

    Nov 4, 2003
    2,002
    Madison, Wisconsin
    #2 F355Bob, Jul 7, 2010
    Change plugs. Car is very sensitive to fouling plugs.
     
  3. BRADAN

    BRADAN Two Time F1 World Champ
    BANNED

    Aug 29, 2009
    22,661
    West Babylon, NY
    Full Name:
    BRADAN
    #3 BRADAN, Jul 7, 2010
    +1 just happened the other day to mine.
     
  4. plugzit

    plugzit F1 Veteran
    Silver Subscribed

    Dec 1, 2004
    7,792
    Redondo Beach, CA
    Full Name:
    Bruce Bogart
    #4 plugzit, Jul 7, 2010
    Backfiring thru intake or exhaust?
     
  5. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,055
    USA
    #5 f355spider, Jul 7, 2010
    I would want to know the cause of the plug fouling, if that is determined to be the source of the issue. Bad plug wires? Or?
     
  6. James-NZ

    James-NZ F1 Veteran

    Jun 26, 2007
    5,822
    Hamilton, NewZealand
    Full Name:
    James
    #6 James-NZ, Jul 7, 2010
    +1

    I agree Hugh, over 20,000 kms in mine on the same plugs, never fouled them. I don't think fouling plugs is a common issue.
     
  7. plugzit

    plugzit F1 Veteran
    Silver Subscribed

    Dec 1, 2004
    7,792
    Redondo Beach, CA
    Full Name:
    Bruce Bogart
    #7 plugzit, Jul 7, 2010
    Exhaust backfire=rich mixture (unburned fuel in exhaust)=possible leaking injector, possible bad plug or plug wire
    Intake backfire=lean mixture=clogged injector?
    Or could be any number of more serious problems ad infinitum
     
  8. Pengster355

    Pengster355 Formula Junior

    Mar 9, 2006
    269
    Singapore
    Full Name:
    Peng Malakul
    #8 Pengster355, Jul 7, 2010
    Thanks, guys. will trace down the wires.

    I hope its not too serious :(

    will keep you posted on the outcome of what happen

    Thanks
    P.
     

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