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slowdown question

Discussion in '348/355' started by lotusk, Dec 11, 2008.

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  1. lotusk

    lotusk Formula 3

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    #1 lotusk, Dec 11, 2008
    can anyone tell me why my slowdown 1-4 light is coming on from start up and then after about 20 - 30 minutes of driving goes out not to come back on until startup again.......it's a 2.7 1995 355 with hyperflows.....when the light is on the car behaves just perfect.......shall I need a new thermo control unit?..I have cleaned and stabilanted the electrical connections
     
  2. gothspeed

    gothspeed F1 World Champ

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    #2 gothspeed, Dec 11, 2008
    What are your other temp gauges reading when the 'slowdown' light comes on?
     
  3. lotusk

    lotusk Formula 3

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    #3 lotusk, Dec 11, 2008
    everything else is fine..light on from cold
     
  4. Oengus

    Oengus F1 World Champ
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    #4 Oengus, Dec 11, 2008
    Put test pipes on it and disconnect them........thats what I did with mine.
     
  5. ernie

    ernie Two Time F1 World Champ
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    #5 ernie, Dec 11, 2008
    Last edited: Dec 11, 2008
    It's the stupid catalytic converter temperature ecu's. Those things are nothing but trouble. If you are getting the light from cold it has to be shot. What side comes on 1/4 or 5/8 bank? What ever the case you can swap the cat ecu's from one side to another to see if the problem jumps banks. Run a search of the archives as it has been talked about loads of times. It's an EASY fix that you can do yourself in minutes. The reason I say swap them from side to side is because if it isn't the cat tamp ecu/s then you could have a thermocouple that has had it or a bad connection. What ever the case it's an EASY do-it-yourself fix, especially since you have a '95 2.7.
     
  6. lotusk

    lotusk Formula 3

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    #6 lotusk, Dec 11, 2008
    its the 1/4 bank..............difficult to get to the electric control unit.........whats the best way...........from underneath the car or from the top???
     
  7. ernie

    ernie Two Time F1 World Champ
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    #7 ernie, Dec 11, 2008
    Last edited by a moderator: Sep 7, 2017
    Oh what the heck, here

    The cat temp ecu can be located behind the shock towers in the rear of the engine bay. Mine aren't there because I got rid of the damn things all together.
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  8. ernie

    ernie Two Time F1 World Champ
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    #8 ernie, Dec 11, 2008
    Last edited by a moderator: Sep 7, 2017
    If after you swap the cat ecu's from side to side, and if you still get the slow down light coming on the same bank, you will want to try the swap again but with the thermocouples. On my 348 they are located on the bottom exit side of the cat.
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  9. ernie

    ernie Two Time F1 World Champ
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    #9 ernie, Dec 11, 2008
    Nope easy as pie.

    Cat ecu's from the top of the engine bay, thermocouples from the bottom of the car.
     
  10. lotusk

    lotusk Formula 3

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    #10 lotusk, Dec 11, 2008
    you're a good man, ernie...........no matter what your friends say!!!!!!!
     
  11. Ricambi America

    Ricambi America F1 World Champ
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    #11 Ricambi America, Dec 11, 2008
    Actually Ernie, that's not where they're located on a F355.
     
  12. lotusk

    lotusk Formula 3

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    #12 lotusk, Dec 11, 2008
    holy crikey.jack russell............more bad info from a ferrari know it all who doesn't??????????....can u tell me if i can remove them from above the car in a 355 because the 2 nuts that hold it on are way back there where its hard to get to.............
     
  13. ernie

    ernie Two Time F1 World Champ
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    #13 ernie, Dec 11, 2008
    Whatchutakinbout Willis?!
     
  14. ernie

    ernie Two Time F1 World Champ
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    #14 ernie, Dec 11, 2008
    Last edited: Dec 11, 2008
    Just follow the wire from the thermocouple, coming out of the cat, back to the ecu.

    And no I don't know squat, but at least I share what I don't know.
     
  15. Ricambi America

    Ricambi America F1 World Champ
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    #15 Ricambi America, Dec 11, 2008
    Last edited by a moderator: Sep 7, 2017
  16. lotusk

    lotusk Formula 3

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    #16 lotusk, Dec 11, 2008
    ernie...you're a funny man..u made me laugh......you must be the fastest milkman in the west (u have to be english to understand that...benny hill song of the 1970's)
     
  17. xplosive1

    xplosive1 Rookie

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    #17 xplosive1, Dec 11, 2008
    Last edited: Dec 11, 2008
    Wow, anyone know where can I find more diagrams like the one above (particularly engine)? Nice to see an exploded picture for my own knowledge. I have a 5.2 model
     
  18. Ricambi America

    Ricambi America F1 World Champ
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    #18 Ricambi America, Dec 11, 2008
  19. J. Salmon

    J. Salmon F1 Rookie
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    #19 J. Salmon, Dec 12, 2008
    When i took mine out, the cases were splitting, as has been foretold here. Black auto silicone used with no regard for beauty, overnight dry, have not had a problem since.
     
  20. Dean355

    Dean355 Formula 3

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    #20 Dean355, Dec 12, 2008
    Hahahaha! Ernie, if you do not know squat, then I am Santa Claus! Hahaha! You made me laugh!!
     
  21. ernie

    ernie Two Time F1 World Champ
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    #21 ernie, Dec 12, 2008
    Ah ha!

    Thanks for the correction Daniel-san. Well at least they are still in the same area.
     

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