308 QV Not idling when hot | FerrariChat

308 QV Not idling when hot

Discussion in 'Technical Q&A' started by Ferraridoc, Aug 24, 2012.

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

  1. Ferraridoc

    Ferraridoc F1 World Champ
    Owner Silver Subscribed

    Jun 20, 2012
    17,258
    Gold Coast, Aust.
    Full Name:
    Patrick
    Hi all,

    Has anyone experienced the car not idling (and therefore dying)?
    It ran OK today, but after a short highway trip, now refuses to idle - I shall try it tomorrow when cold, to see if it's just when hot, but I thought there might be a common problem/fix, before I go poking around with a screwdriver and a bad attitude.

    Cheers

    Patrick
     
  2. DGS

    DGS Seven Time F1 World Champ
    Rossa Subscribed

    May 27, 2003
    72,887
    MidTN
    Full Name:
    DGS
    Possible vac leak, or the throttle switch connector may have come off.

    CIS is pretty reliable, but when it does go wrong, you have to check everything, one piece at a time.
     
  3. davebuchner

    davebuchner Formula 3

    Jun 1, 2005
    2,487
    London UK
    Full Name:
    Dave Buchner
    It could be a mechanical adjustement as well, rather than a gas / air mixture issue. My QV was doing the same a few weeks ago after a service, but not when cold.

    I eventually got tired of jumping on the accelerator when coasting to the traffic lights, to prevent it dying, and adjusted the screw on the rear of the plenum cover. Not the big shiny metal screw that adjusts the mixture, but the little screw surrounded by a black plastic guard, that physically prevents the throttle from closing all the way.
     
  4. davebuchner

    davebuchner Formula 3

    Jun 1, 2005
    2,487
    London UK
    Full Name:
    Dave Buchner
    When the car is hot, adjust the screw down, ie holding the throttle open more, and then gradually back off on the screw until it can still hold the idle.

    While you are at it, you may want to aadjust the acceleartor cable as well as this may have developed some slack. I think this is adjusted by accessing the panel under the pedal box from underneath the car
     
  5. Ferraridoc

    Ferraridoc F1 World Champ
    Owner Silver Subscribed

    Jun 20, 2012
    17,258
    Gold Coast, Aust.
    Full Name:
    Patrick
    Thanks, everyone

    I adjusted the idle screw, in the end. I still can't explain why it happened so suddenly. Incidentally, I couldn't find a screwdriver, so used the one in the tool roll! It looks like I have only 1 or 2 missing tools in there - does anyone know what it should contain?

    Patrick
     

Share This Page