SLOW DOWN LIGHT | FerrariChat

SLOW DOWN LIGHT

Discussion in '456/550/575' started by arkferrari, Mar 26, 2018.

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  1. arkferrari

    arkferrari Karting
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    Feb 9, 2004
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    Hot Springs, AR
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    B.F. Mitchell
    #1 arkferrari, Mar 26, 2018
    Both catalytic converters have been removed from my 99 456M GTA; they are not being replaced. I am attempting to eliminate the amber flashing "Slow Down" light. My research tells me that the 02 sensors are sending misinformation to the ECUs causing the SDL warning. Before replacing the sensors, can I install 02 sensor spacers (Spark Plug Non-Foulers) and using the old 02 sensors see if the SDL goes off? My research says the sensor spacers are needed when the cats are missing; is this true? Are special spacers necessary for Bosch or NTK sensors or will generic brands at AutoZone work? To complicate the matter, is there room for the spacers with the rear 02 sensors? How difficult a job is it to access the rear 02 sensors? Thanks for the help.
     
  2. arkferrari

    arkferrari Karting
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    Feb 9, 2004
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    B.F. Mitchell
    #2 arkferrari, Mar 29, 2018
    107 views thus far.....107! And no, zero, zilch replies or comments. I was expecting something......
     
  3. franschman

    franschman Formula Junior

    Dec 18, 2017
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    Bart
    #3 franschman, Mar 30, 2018
    The sensors are all readily accessible, but no clue how to fool the ecu.
     
  4. tazandjan

    tazandjan Three Time F1 World Champ
    Lifetime Rossa Owner

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    #4 tazandjan, Mar 31, 2018
    You got one from John in the tech forum.
     
  5. arkferrari

    arkferrari Karting
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    B.F. Mitchell
    #5 arkferrari, Mar 31, 2018
    I've looked in the Tech Forum and can't find a response. Please advise. Thanks
     
  6. INRange

    INRange F1 World Champ
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    JD
    #6 INRange, Mar 31, 2018
    I would drop Gothspeed a message and see what he says. I believe your thermocouplers have their own ECU and that the SDL circuit is separate from the engine ECU.
     
  7. Dave rocks

    Dave rocks F1 World Champ
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    #7 Dave rocks, Mar 31, 2018
    And a couple on F-Life ;)
     
  8. F456M

    F456M F1 Rookie

    Jan 8, 2010
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    #8 F456M, Mar 31, 2018
    I think the temp sensors are giving you that signal, not the lambda sensors. I put catalyzers on my 456M and the light disappeared. The car ran much better with the caralyzers and used less fuel too. No need to run without cats.
     
  9. tazandjan

    tazandjan Three Time F1 World Champ
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    Jul 19, 2008
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    Terry H Phillips
    #9 tazandjan, Mar 31, 2018
    I probably saw it on the other site.
     
  10. Adam3442

    Adam3442 Rookie
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    May 3, 2018
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    Adam Larman
    #10 Adam3442, May 3, 2018
    When I've removed cats before (albeit not Ferrari's) I normally put an extension on the lambda fitting. This moves the Lambda out of the direct travel of exhaust gasses and they read less and more in line with the reading they should get when cats are still fitted.
     

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