Idle speed adjustment on 1990 Testarossa | FerrariChat
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Idle speed adjustment on 1990 Testarossa

Discussion in 'Boxers/TR/M' started by Alan Paladino, May 28, 2012.

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  1. Alan Paladino

    Alan Paladino Guest

    Aug 6, 2008
    27
    #1 Alan Paladino, May 28, 2012
    Does anyone know how to adjust the idle speed on a 1990 Testarossa? The service manual cd for 1984 -1991 has a diagram showing the location of a "throttle position adjustment screw" in the adjustment of idle speed section , but on my '90 there is none. The manual says the idle speed should be 900 - 1100 RPM, but my car is at 800 and frequently stalls at stops. Otherwise it runs fine.
     
  2. carguy

    carguy F1 Rookie

    Oct 30, 2002
    3,424
    Alabama (was Mich.)
    Full Name:
    Jeff
    #2 carguy, May 28, 2012
    The idle speed is adjusted with air bypass screws located at rear of the throttle bodies. It's a large brass hex bolt. What ever you do, make very small adjustments. The TR's motor runs like to 6 cylinders engines, so it would be good to know if your fuel mixtures are balanced. Do you have access to a gas analyzer?
     
  3. Alan Paladino

    Alan Paladino Guest

    Aug 6, 2008
    27
    #3 Alan Paladino, May 28, 2012
    Hi Jeff,
    Thanks for the response. I don't have access to a gas analyzer - is there any other way to check the adjustment?
    Al
     
  4. godabitibi

    godabitibi F1 Veteran

    Jan 11, 2012
    6,329
    Papineauville, Quebec
    Full Name:
    Claude Laforest
    #4 godabitibi, May 28, 2012
    I think a vacuum guage on each side should work too. But I'm no expert.
     

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