Cold start Rough idle issue on 91 T | FerrariChat
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Cold start Rough idle issue on 91 T

Discussion in 'Technical Q&A' started by gidleigh, Apr 11, 2011.

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  1. gidleigh

    gidleigh Karting

    Nov 27, 2010
    141
    Coronado, Ca
    #1 gidleigh, Apr 11, 2011
    With a cold start my car is not getting enough gas, therefor runs rough. This just started. I guess it could be a cold start relay, but I would like to get some input on diagnosing the problem.

    There is a thread on the mondial 3.2 but not the 3.4. Thanks
     
  2. tazandjan

    tazandjan Three Time F1 World Champ
    Lifetime Rossa Owner

    Jul 19, 2008
    39,312
    Clarksville, Tennessee
    Full Name:
    Terry H Phillips
    #2 tazandjan, Apr 12, 2011
    Turns out if the Mass Air Flow meter hot wires get crud on them, rough cold starts can be a symptom. You can test it out yourself by just letting the car turn over once or twice and shutting it down before it starts. Then try a normal start and see what you get. If she starts fine, your first turn or two heated up the MAF sensor wires and that fixed the problem. If so, clean the wires very carefully.

    See this thread for more info. Start on Post #46 to speed things along.

    http://www.ferrarichat.com/forum/showthread.php?t=269675

    Taz
    Terry Phillips
     
  3. gidleigh

    gidleigh Karting

    Nov 27, 2010
    141
    Coronado, Ca
    #3 gidleigh, Apr 13, 2011
    Thanks I will give it a try.
     
  4. gidleigh

    gidleigh Karting

    Nov 27, 2010
    141
    Coronado, Ca
    #4 gidleigh, Apr 14, 2011
    I should have been more specific. The car turns over and starts fine. After that it runs rough until it warms up. Does anybody know where the cold start relay is.
     
  5. tazandjan

    tazandjan Three Time F1 World Champ
    Lifetime Rossa Owner

    Jul 19, 2008
    39,312
    Clarksville, Tennessee
    Full Name:
    Terry H Phillips
    #5 tazandjan, Apr 14, 2011
    Go to this website and download a 348 workshop manual. Engines are the same.

    Symptoms you are describing, starts fine, runs rough until warm are also symptoms of dirty MAF hot wires. Try the double start and see what happens. The dirty wires somehow mis-set the cold start feature.

    http://www.ferraridatabase.com/The_Downloads/Downloads.htm

    Taz
    Terry Phillips
     

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