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348 Low rev missfire

Discussion in 'Technical Q&A' started by Btheun, Sep 2, 2008.

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  1. Btheun

    Btheun Rookie

    Aug 25, 2008
    1
    South Africa
    Full Name:
    Brandt Theunissen
    #1 Btheun, Sep 2, 2008
    Please help. My 348ts has developed a low rev miss under load conditions. it misses up to 3000RPM when pulling away, at 300RPM all cylinders fire and the car goes like a rocket. The previous time this happened I changed all the spark plugs and it sorted the problem, but now it isn't working. Any suggestions?
     
  2. ernie

    ernie Two Time F1 World Champ
    Lifetime Rossa Owner

    Nov 19, 2001
    22,620
    The Brickyard
    Full Name:
    The Bad Guy
    #2 ernie, Sep 2, 2008
    Last edited: Sep 2, 2008
    Start by checking the following:

    1) Ground wires
    Make sure that they are hooked up properly, especially the one from the transmission to the subframe.

    2) Spark plug wires & spark plugs
    Check to make sure that the plug wires aren't shorting out. Then check the spark plugs to make sure that all look the same, and to be in good condition.

    3) Mass Air Flow Sensors
    You want to make sure the the connections are clean and connected properly.

    4) Crank sensors
    Make sure that the connections for the crank sensors are clean and connected properly. You will also want to inspect the condition of the wires on the back of the clips to make sure they aren't broken, or that the wire shielding isn't cracked. You will need to peal back the rubber boots on the back of the clip expose the three wires.

    Start with that and see what you turn up.



    Oh yes, and welcome to FerrariChat. Fill out your profile while you are at it.
     
  3. fatbillybob

    fatbillybob Two Time F1 World Champ
    Consultant Owner

    Aug 10, 2002
    29,203
    socal
    #3 fatbillybob, Sep 2, 2008
    My vote= plug wire
     

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