348 stalls when hot, then starts when cools | FerrariChat
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348 stalls when hot, then starts when cools

Discussion in '348/355' started by SHEMM, Sep 25, 2010.

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  1. SHEMM

    SHEMM Formula Junior

    Jul 8, 2007
    393
    Toronto
    Full Name:
    ILIO
    #1 SHEMM, Sep 25, 2010
    Last summer I experienced this problem, then went away over the winter when stored, however, a friend of mine now has the same problem with his 94 348 spider.

    Car starts fine, drives about 15 mins, then when coming to a stop, revs drop like half the engine is working and quickly stalls. After about 10 mins (sometime longer depending on how hot the engine is), it restarts (not easily) and drives for another 10 mins.

    Any ideas - tried looking for a thread on this but couldn't locate anything.

    Thanks!
     
  2. Miltonian

    Miltonian F1 Veteran

    Dec 11, 2002
    5,966
    Milton, Wash.
    Full Name:
    Jeff B.
    #2 Miltonian, Sep 25, 2010
    Any "Check Engine" lights coming on?

    Any "Slow Down" lights coming on?

    Has the battery been disconnected or run down dead? May just need to re-initialize.
     
  3. davebdave

    davebdave Formula 3
    Owner Silver Subscribed

    Mar 18, 2007
    2,381
    Northern VA
    Full Name:
    Dave W
    #3 davebdave, Sep 28, 2010
    I'll admit I am obsessed with crank sensors at the moment, but our Mondial t was doing something very similar. It would run fine and then it would barely idle and quit if I didn't keep hitting the throttle. The restart was shaky but it would light. After a cool down it was fine for 10-15 minutes as you said. I did however get both check engine lights off and on.

    I discovered the wire insulation was gone from the bottom crank sensor. That one I believe is used by both banks to determine the idle speed.

    Got me a couple of Kia Crank Sensors (and two o2 sensors) and all is well. I did have the battery switched off while we did the installation so who knows what really fixed it.

    dave
     
  4. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #4 No Doubt, Sep 29, 2010
    The cheap (free!) first test is to open both idle air bypasses by half a turn. That might raise your idle a little, but see if she still stalls when hot under the same conditions as before.

    If not, clean your throttle bodies and bypasses!
     
  5. SHEMM

    SHEMM Formula Junior

    Jul 8, 2007
    393
    Toronto
    Full Name:
    ILIO
    #5 SHEMM, Oct 3, 2010
    Yes - battery was replaced - went dead - no lights on except battery light comes on from time to time.

    How do you re-initialize it?

    Thanks,

    Ilio
     
  6. SHEMM

    SHEMM Formula Junior

    Jul 8, 2007
    393
    Toronto
    Full Name:
    ILIO
    #6 SHEMM, Oct 3, 2010
    Thanks! - will take a look at those.
     
  7. SHEMM

    SHEMM Formula Junior

    Jul 8, 2007
    393
    Toronto
    Full Name:
    ILIO
    #7 SHEMM, Oct 3, 2010
    Thanks - will try that if there is nothing obvious with the wiring.
     
  8. Miltonian

    Miltonian F1 Veteran

    Dec 11, 2002
    5,966
    Milton, Wash.
    Full Name:
    Jeff B.
    #8 Miltonian, Oct 3, 2010
    To re-initialize:

    1) Shut off the battery for a few minutes, then turn the power back on.

    2) Start the engine and let it idle. Don't touch the gas pedal during this step, don't rev the engine at all.

    3) After about 10 minutes, shut off the engine, then restart normally.

    4) Test drive it and see if that helped!
     

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