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355 emissions

Discussion in 'Technical Q&A' started by virendra, Nov 1, 2011.

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  1. virendra

    virendra Formula Junior

    Jun 14, 2008
    251
    Hong Kong
    Full Name:
    virendra anand
    #1 virendra, Nov 1, 2011
    Hi I have a 35 1996 model which failed the emissions on the high rev range (was asked to rev it at 2000 rpm). Its fitted with a capristo exhaust. Any idea as to how to improve emissions beside the usual clean up of plugs. Car was prepped for a race track in the past but need to make it road legal now. it has about 40000 miles on it. Car was unused for a year and just comissioned it a few weeks ago with regular starts every few days.
     
  2. plugzit

    plugzit F1 Veteran
    Silver Subscribed

    Dec 1, 2004
    7,793
    Redondo Beach, CA
    Full Name:
    Bruce Bogart
    #2 plugzit, Nov 1, 2011
    Maybe not enough back pressure in exhaust to heat cats sufficiently. Drive the poop out of it on the way to the smog check. I'm no expert!
     
  3. PV Dirk

    PV Dirk F1 Veteran

    Jul 26, 2009
    5,401
    Ahwatukee, AZ
    #3 PV Dirk, Nov 1, 2011
    There are multiple emissions elements that could have caused a fail. NOx will be lean or too hot, CO too rich or cat not working right, not up to temp. It is correct that generally you want the car to be up to full temp before testing. Put on highway for 30 minutes to an hour.
     
  4. Dr_ferrari

    Dr_ferrari Formula 3
    Consultant Professional Ferrari Technician

    Nov 2, 2003
    1,073
    Pocono Sportscar
    Full Name:
    Jim McGee
    #4 Dr_ferrari, Nov 1, 2011
    Last edited: Nov 1, 2011
    1 - Are the cats oem?
    2 - check the bypass valve to make sure it is not open

    Regards, Jim
     
  5. virendra

    virendra Formula Junior

    Jun 14, 2008
    251
    Hong Kong
    Full Name:
    virendra anand
    #5 virendra, Nov 1, 2011
    many thanks everyone, will check cats if OEM or not. I suspect not or maybe modified as the ENGINE SLOWDOWN warning lamp had been removed from the dash panel by prev owner. suspect it could be linked. Does replacing the Capristo with an OEM have a chance of improving anything or does the CAPRISTO just add noise.
     
  6. Dr_ferrari

    Dr_ferrari Formula 3
    Consultant Professional Ferrari Technician

    Nov 2, 2003
    1,073
    Pocono Sportscar
    Full Name:
    Jim McGee
    #6 Dr_ferrari, Nov 1, 2011
    The capristo should not effect the emmisions unless the bypass valve has been modified or the cats modified.
     

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