355 Cat ECU CEl eliminator | FerrariChat
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355 Cat ECU CEl eliminator

Discussion in 'Technical Q&A' started by JeffBarber, Apr 26, 2011.

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  1. JeffBarber

    JeffBarber Karting

    Feb 6, 2011
    175
    Lascassas, TN
    Full Name:
    Jeff
    #1 JeffBarber, Apr 26, 2011
    So I've had my 3 cat ecu's on my 97 355 unplugged for 1000 miles and everything's great except for CEL that you get when you unplug. Does anyone know of a way to eliminate this? Is there maybe some sort of circuit board I could plug the cat ecu plug into instead of the cat ecu and get the return voltages I need back to main ecu? I've looked everywhere on the web and can't find one. p.s. I have no cats.

    Any help much appreciated,
    Jeff
     
  2. muk_yan_jong

    muk_yan_jong Formula Junior

    Oct 11, 2008
    570
    Full Name:
    Brian McK
    #2 muk_yan_jong, Apr 26, 2011
    Black Electrical Tape
     
  3. kverges

    kverges F1 Rookie

    Nov 18, 2003
    3,179
    Dallas
    Full Name:
    Keith Verges
    #3 kverges, Apr 26, 2011
    put cats on the car. back in the day I used to run a car or 2 non-cat, but with the inexpensive, hight flow, metal matrix cats out there today, there is no reason not to run cats. All my street cars have cats nowadays, even the turbo and supercharged cars. I won't preach any more than to say it is not necessary and socially irresponsible to run without catalytic converters these days
     
  4. Driftracer3

    Driftracer3 Formula Junior

    Jan 5, 2006
    640
    #4 Driftracer3, Apr 26, 2011
    I will agree on why to run cats.

    If the cat ECUs are in the car, I believe the ECU coding can be modified to ignore the low temp readings from the thermocouples. However, if the ECUs themselves dont work (sending an incorrect voltage or none at all) you cant really do anything but replace them.
     
  5. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,055
    USA
    #5 f355spider, Apr 27, 2011
    Unlikely you can.

    You will have two codes for "low catalyst efficiency" on each bank, PLUS you will have a code for the exhaust bypass valve.

    Why are they unplugged? You gain nothing by having them unplugged.
     

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