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Slow Down 1/4 Speed Light Question

Discussion in '348/355' started by sjscansaroli, Mar 6, 2013.

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  1. sjscansaroli

    sjscansaroli Rookie

    Sep 12, 2010
    14
    New Jersey USA
    Full Name:
    Steven J Scansaroli
    #1 sjscansaroli, Mar 6, 2013
    How often does your "Slow Down 1/4 speed" go on? Mine goes on when going slow, sometimes after highway driving, there seems to be no main reason.

    Any suggestions too?

    Thanks,
    Steve
     
  2. ernie

    ernie Two Time F1 World Champ
    Lifetime Rossa Owner

    Nov 19, 2001
    22,614
    The Brickyard
    Full Name:
    The Bad Guy
    #2 ernie, Mar 6, 2013
    Never.

    Why?

    I removed the stupid cat ecus & thermocouples, capped the holes, and removed the bulbs. :D
     
  3. 355dreamer

    355dreamer F1 World Champ
    Owner

    Apr 3, 2006
    10,476
    DC Metro
    Full Name:
    L.C.
    #3 355dreamer, Mar 6, 2013
    Hey Dave...
    I have a 95, so I don't have to worry about that. ;)
     
  4. plugzit

    plugzit F1 Veteran
    Silver Subscribed

    Dec 1, 2004
    7,777
    Redondo Beach, CA
    Full Name:
    Bruce Bogart
    #4 plugzit, Mar 6, 2013
    Steve-
    The search function at top right of this section will return a great deal of information on diagnosing the issue. You're fortunate you have a 348, as diagnosis is usually easy. It's probably not serious, but warrants attention. It's usually related to the cats and their ecu's.
     
  5. ernie

    ernie Two Time F1 World Champ
    Lifetime Rossa Owner

    Nov 19, 2001
    22,614
    The Brickyard
    Full Name:
    The Bad Guy
    #5 ernie, Mar 6, 2013
    On a serious tip,

    It's one of four things:

    1) bad cat ecu
    2) bad thermocouple
    3) bad/corroded connection
    4) genuine overly rich fuel condition

    How to check?
    Swap the cat ecu's from side to side and see if the SDL jumps to the 5/8 bank.
     
  6. treedee3d

    treedee3d F1 Rookie

    Apr 1, 2011
    3,726
    Montreal
    Full Name:
    Fab
    #6 treedee3d, Mar 7, 2013
    Mine is a 95 also. Because I am catless, I don't have to worry about the light coming on but it was annoying so I swapped the cat ecus and the light then moved other to the 5-8 so I knew that was the problem and changed it.

    Since then, no more slowdown light.
     

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