Ferrari Testarossa 91, Slowdown Problems | FerrariChat
Buy

Ferrari Testarossa 91, Slowdown Problems

Discussion in 'Technical Q&A' started by 3nzo_1994, Feb 16, 2022.

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

  1. 3nzo_1994

    3nzo_1994 Rookie

    Dec 31, 2021
    5
    Full Name:
    Serra Enzo
    #1 3nzo_1994, Feb 16, 2022
    Hi everyone.
    I'm Enzo.
    i am working on a ferrari testarossa which had some big problems.
    I've been following the forum for a while, but I couldn't find any confirmations regarding the "SLOWDOWN CYL 1-6, 7-12" LIGHTS.
    I explain to you that he had problems,
    unfortunately the passenger compartment electrical system caught fire with the consequence of the complete replacement of the electrical system, it was a disaster to find the right components, the car is from 1991 registered in Ontario, but the electrical system is from 1988.
    once the electrical system was replaced at the first start up I immediately saw the Slowdown lights that dimmed, the "problem" solved itself until after a ride to test the car, my client noticed the lights that were they turned on and then went out immediately, sometimes they went intermittently and then they remained fixed. the performance of the car did not change with the lights on.
    could it be a problem with the CCUs?

    thank you all .
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,781
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Feb 16, 2022
    Yes, the slowdown warning light ECUs on a TR have been reported as being a common failure (myself included). There is no "intelligent" connection between these slowdown warning light ECUs and the TR engine management system (so whether they are "on", or "off", or "flashing", the engine running will not change from whatever it is doing). If they ever do something that is obviously impossible or wrong -- like staying "on" at cold start-up or not doing the self-test at start-up correctly every time = strong sign that it/they should be replaced (if only one side is misbehaving, you can swap the ECUs and see if the problem moves to the other bank, or not). For a "real" thermal overheat, properly detected by the slowdown warning light ECU (measured by the thermocouple), the warning light should first flash as it gets too hot and then stay "on" solid if you keep driving and it gets very too hot (the exhaust temperatures for triggering these events are listed in the cat-equipped TR OMs) -- consequently, if you are just driving along and a slowdown warning light comes "on" solid = that really isn't quite right behavior either. Of course, if the slowdown warning light comes "on", the Driver should get out and look at the precats/cats -- in a real overheat situation they would be glowing red hot and nearby components/paint would be smoking from the radiant heat transfer.
     
    2NA and 3nzo_1994 like this.
  3. 3nzo_1994

    3nzo_1994 Rookie

    Dec 31, 2021
    5
    Full Name:
    Serra Enzo
    #3 3nzo_1994, Feb 17, 2022
    thank you very much for your quick reply.
    today I found that the self-test is not carried out, so the problem lies in the ccu. I have already found the original spare parts, do you have anything to recommend?
    I have read that some users have completely disconnected the management of the CAT temperature, but I would not want that one day it could really be useful
     
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,781
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #4 Steve Magnusson, Feb 17, 2022
    If all of the catalytic structures have been removed from the precats and cats, then disconnecting the slowdown warning light ECUs is OK, but, if any of them are still present, I agree that it's important to have a working exhaust over-temperature detection system. The self-test not working can be a little diabolically misleading -- when the lights don't come "on" at all, people think everything is OK when it really isn't.
     
    2NA and 3nzo_1994 like this.
  5. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,089
    Cowboy Capitol of the World
    Full Name:
    Brian Crall
    #5 Rifledriver, Feb 17, 2022
    As Steve said if the cats are functioning you really want that system functioning. I did a very large repair on one that caught fire due to an overheating cat.

    At the time those were built Ferrari legal thought their liability would be too large it the system had the ability to cut engine power.
     
  6. 3nzo_1994

    3nzo_1994 Rookie

    Dec 31, 2021
    5
    Full Name:
    Serra Enzo
    #6 3nzo_1994, Feb 17, 2022
    Perfect, I will check the CATs and act accordingly, if the CATs work well, the ECUs need to be replaced, if they work badly they will probably be obstructed.
    But since the cat lights do not come on when turned on, I assume that the problem is just that. do i buy the original parts or are there aftermarket CCUs for this Ferrari?
     
  7. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,089
    Cowboy Capitol of the World
    Full Name:
    Brian Crall
    #7 Rifledriver, Feb 17, 2022
    Check with Ricambi. I believe he was selling an aftermarket unit. May require modifying connections. TR alone used 3 different connector types.
     
  8. 3nzo_1994

    3nzo_1994 Rookie

    Dec 31, 2021
    5
    Full Name:
    Serra Enzo
    #8 3nzo_1994, Feb 17, 2022
    si, ho notato che i connettori TR sono un pasticcio, ma ho trovato le centraline COD 141037.
    un'ultima curiosità, dov'è questo "RICAMBI"? è nel Forum?
     
  9. afterburner

    afterburner F1 Rookie
    Silver Subscribed

    Jun 20, 2008
    3,470
    Switzerland
    Full Name:
    Urs STEMMLER
    #9 afterburner, Feb 18, 2022
    "Ricambi" è un fornitore molto riconosciuto americano specializzato nei ricambi Ferrari:

    www.ricambiamerica.com
     
  10. 3nzo_1994

    3nzo_1994 Rookie

    Dec 31, 2021
    5
    Full Name:
    Serra Enzo
    #10 3nzo_1994, Feb 18, 2022
    grazie mille, l'avevo già contattato in precedenza per altri pezzi di ricambio. grazie di tutto ragazzi.
     
    afterburner likes this.

Share This Page