slowdown question | FerrariChat

slowdown question

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

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. lotusk

    lotusk Formula 3

    Joined:
    Nov 3, 2003
    Messages:
    1,840
    Location:
    London UK
    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
     
    lotusk, Dec 11, 2008
    #1
  2. gothspeed

    gothspeed F1 World Champ

    Joined:
    May 26, 2006
    Messages:
    10,244
    Location:
    U.S.A.
    Full Name:
    goth
    What are your other temp gauges reading when the 'slowdown' light comes on?
     
    gothspeed, Dec 11, 2008
    #2
  3. lotusk

    lotusk Formula 3

    Joined:
    Nov 3, 2003
    Messages:
    1,840
    Location:
    London UK
    everything else is fine..light on from cold
     
    lotusk, Dec 11, 2008
    #3
  4. Oengus

    Oengus F1 World Champ Rossa Subscribed Silver Subscribed

    Joined:
    Sep 29, 2004
    Messages:
    10,870
    Location:
    Between timing belts/chains or West Palm Beach FL
    Full Name:
    Chas
    Put test pipes on it and disconnect them........thats what I did with mine.
     
    Oengus, Dec 11, 2008
    #4
  5. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

    Joined:
    Nov 19, 2001
    Messages:
    22,620
    Location:
    The Brickyard
    Full Name:
    The Bad Guy
    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.
     
    Last edited: Dec 11, 2008
    ernie, Dec 11, 2008
    #5
  6. lotusk

    lotusk Formula 3

    Joined:
    Nov 3, 2003
    Messages:
    1,840
    Location:
    London UK
    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???
     
    lotusk, Dec 11, 2008
    #6
  7. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

    Joined:
    Nov 19, 2001
    Messages:
    22,620
    Location:
    The Brickyard
    Full Name:
    The Bad Guy
    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.
    Image Unavailable, Please Login
     
    Last edited by a moderator: Sep 7, 2017
    ernie, Dec 11, 2008
    #7
  8. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

    Joined:
    Nov 19, 2001
    Messages:
    22,620
    Location:
    The Brickyard
    Full Name:
    The Bad Guy
    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.
    Image Unavailable, Please Login
     
    Last edited by a moderator: Sep 7, 2017
    ernie, Dec 11, 2008
    #8
  9. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

    Joined:
    Nov 19, 2001
    Messages:
    22,620
    Location:
    The Brickyard
    Full Name:
    The Bad Guy
    Nope easy as pie.

    Cat ecu's from the top of the engine bay, thermocouples from the bottom of the car.
     
    ernie, Dec 11, 2008
    #9
  10. lotusk

    lotusk Formula 3

    Joined:
    Nov 3, 2003
    Messages:
    1,840
    Location:
    London UK
    you're a good man, ernie...........no matter what your friends say!!!!!!!
     
    lotusk, Dec 11, 2008
    #10
  11. Ricambi America

    Ricambi America F1 World Champ Sponsor Owner

    Joined:
    Dec 7, 2003
    Messages:
    16,476
    Location:
    Winston Salem, NC
    Actually Ernie, that's not where they're located on a F355.
     
    Ricambi America, Dec 11, 2008
    #11
  12. lotusk

    lotusk Formula 3

    Joined:
    Nov 3, 2003
    Messages:
    1,840
    Location:
    London UK
    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.............
     
    lotusk, Dec 11, 2008
    #12
  13. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

    Joined:
    Nov 19, 2001
    Messages:
    22,620
    Location:
    The Brickyard
    Full Name:
    The Bad Guy
    Whatchutakinbout Willis?!
     
    ernie, Dec 11, 2008
    #13
  14. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

    Joined:
    Nov 19, 2001
    Messages:
    22,620
    Location:
    The Brickyard
    Full Name:
    The Bad Guy
    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.
     
    Last edited: Dec 11, 2008
    ernie, Dec 11, 2008
    #14
  15. Ricambi America

    Ricambi America F1 World Champ Sponsor Owner

    Joined:
    Dec 7, 2003
    Messages:
    16,476
    Location:
    Winston Salem, NC
    Last edited by a moderator: Sep 7, 2017
    Ricambi America, Dec 11, 2008
    #15
  16. lotusk

    lotusk Formula 3

    Joined:
    Nov 3, 2003
    Messages:
    1,840
    Location:
    London UK
    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)
     
    lotusk, Dec 11, 2008
    #16
  17. xplosive1

    xplosive1 Rookie

    Joined:
    May 15, 2008
    Messages:
    22
    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
     
    Last edited: Dec 11, 2008
    xplosive1, Dec 11, 2008
    #17
  18. Ricambi America

    Ricambi America F1 World Champ Sponsor Owner

    Joined:
    Dec 7, 2003
    Messages:
    16,476
    Location:
    Winston Salem, NC
    Ricambi America, Dec 11, 2008
    #18
  19. J. Salmon

    J. Salmon F1 Rookie Owner Rossa Subscribed

    Joined:
    Aug 27, 2005
    Messages:
    4,367
    Location:
    VA
    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.
     
    J. Salmon, Dec 12, 2008
    #19
  20. Dean355

    Dean355 Formula 3

    Joined:
    Sep 4, 2006
    Messages:
    1,101
    Location:
    South Florida
    Full Name:
    Dean
    Hahahaha! Ernie, if you do not know squat, then I am Santa Claus! Hahaha! You made me laugh!!
     
    Dean355, Dec 12, 2008
    #20
  21. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

    Joined:
    Nov 19, 2001
    Messages:
    22,620
    Location:
    The Brickyard
    Full Name:
    The Bad Guy
    Ah ha!

    Thanks for the correction Daniel-san. Well at least they are still in the same area.
     
    ernie, Dec 12, 2008
    #21

Share This Page