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Discussion in 'Vintage (thru 365 GTC4)' started by 330GTCFERRARI, Jul 24, 2012.

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  1. 330GTCFERRARI

    330GTCFERRARI Karting

    Jun 21, 2012
    99
    NYC
    #1 330GTCFERRARI, Jul 24, 2012
    Got my carbs adjusted and cleaned up and cr runs great. However, maybe once a day I will go to takeoff at a stop light nd touch te gas an hear a pop followed by three seconds of rough running car sounds weird. It is always after a recent start up with auto flux on. Seems like there might be too much fuel sitting in the bowls. Stock ad pump and mechanical.
     
  2. John Vardanian

    John Vardanian F1 Rookie

    Jul 1, 2004
    3,080
    San Francisco Area
    Full Name:
    John Vardanian
    #2 John Vardanian, Jul 24, 2012
    Sounds like too lean of fuel mixture.

    john
     
  3. f308jack

    f308jack F1 Rookie

    Jun 7, 2007
    4,300
    Cape Town, South Afr
    Full Name:
    Jack Verschuur
    #3 f308jack, Jul 25, 2012
    Agree with John, sticky needle in 1 carb perhaps?
     
  4. DWR46

    DWR46 Formula 3
    Honorary

    Jun 19, 2012
    2,038
    #4 DWR46, Jul 25, 2012
    Are you in the US and using ethanol fuels? If so, you may need one size larger idle jets.

    1. Try opening the Idle Mixture screws on all the carbs by 1/8 turn. This may be all that is required to add enough fuel.
    2. Does the car have DFI carbs? If so, make sure the synchronization process used the Idle Air Bypass Screws and started with them ALL closed.
    3. Recheck the float levels.
    4. Try one size larger Idle Jet.
     
  5. yale

    yale Formula Junior

    May 2, 2004
    744
    New York City
    #5 yale, Jul 25, 2012
    Who did you decide on as a mechanic?
     
  6. 330GTCFERRARI

    330GTCFERRARI Karting

    Jun 21, 2012
    99
    NYC
    #6 330GTCFERRARI, Jul 25, 2012
    Haven't yet. This was work done at previous place and I'm pretty ticked. Carbs shouldn't be having issues after just being worked on
     
  7. davehelms

    davehelms F1 Rookie

    Jan 3, 2004
    4,629
    Full Name:
    Dave Helms
    #7 davehelms, Jul 27, 2012
    At what ambient temp, using what fuel, at what altitude?

    On a hot day, running the alcohol fuel, you need only sit at a stop light for a half minute before this fuel starts to boil in the float chambers. If it is jetted rich it will help cover up the issues but jetted correctly it will show quite plainly in transition lean spots and backfires.

    "Adjusted and cleaned" is quite a vague terminology that leaves a lot to the imagination.
     
  8. michael bayer

    michael bayer Formula 3

    Aug 4, 2004
    1,293
    #8 michael bayer, Jul 28, 2012
    Does sound like a stuck float or valve but just in case Did you check to see if the accellerator pumps are all working? Pull air cleaner lid look down the carb barrels and pull the throttle cable you should have a good squirt out of all six
     

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