Slow Down 1/4 Speed Light Question | FerrariChat

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

    Joined:
    Sep 12, 2010
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    Location:
    New Jersey USA
    Full Name:
    Steven J Scansaroli
    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
     
    sjscansaroli, Mar 6, 2013
    #1
  2. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    The Bad Guy
    Never.

    Why?

    I removed the stupid cat ecus & thermocouples, capped the holes, and removed the bulbs. :D
     
    ernie, Mar 6, 2013
    #2
  3. 355dreamer

    355dreamer F1 World Champ Owner

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    L.C.
    Hey Dave...
    I have a 95, so I don't have to worry about that. ;)
     
    355dreamer, Mar 6, 2013
    #3
  4. plugzit

    plugzit F1 Veteran Silver Subscribed

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    Bruce Bogart
    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.
     
    plugzit, Mar 6, 2013
    #4
  5. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    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.
     
    ernie, Mar 6, 2013
    #5
  6. treedee3d

    treedee3d F1 Rookie

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    Fab
    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.
     
    treedee3d, Mar 7, 2013
    #6

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