83 Mondial 4v | FerrariChat
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83 Mondial 4v

Discussion in 'Mondial' started by luda123, Mar 16, 2010.

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  1. luda123

    luda123 Rookie

    Mar 16, 2010
    7
    #1 luda123, Mar 16, 2010
    Last edited: Mar 16, 2010
    I have been struggling with my 1983 4v Mondial. Basically, after replacing the fuel distributor with a rebuilt unit, replacing the spark plugs, wires, distributor rotors and cap, fuel filter, the car is difficult to start and will not idle properly. It will run for few 20 30 seconds, then if the gas pedal is pressed on and released, the idle will go down to about 500 rpm then the car shuts down,and the metering plate on the fuel distributor shuts close.
    Here are the facts:
    The car is running rich on all cylinders since the plugs are black an dgetting fouled. The system fuel pressure is too high at 105 psi when measured between the fuel pump and the inlet to the fuel distributor. The return line was inspected for blockage and is free from any obstruction. The volume of gas from the return line is 700ml/30 seconds. spark is present at both banks and at all plugs.
    Same symptoms even with the cold start injector unplugged and the fuel pressure regulator unplugged.
    Any help would be appreciated
     
  2. fgcfire8

    fgcfire8 Formula Junior

    Jan 19, 2008
    459
    Montpelier Va
    Full Name:
    Frank Castelvecchi
    #2 fgcfire8, Mar 16, 2010
    Might be bad fuel pressure regulator
    Unplugging the vacuum line from it would make it worse as the vacuum is used to reduce the pressure when at idle needing less fuel
     
  3. PV Dirk

    PV Dirk F1 Veteran

    Jul 26, 2009
    5,401
    Ahwatukee, AZ
    #3 PV Dirk, Mar 16, 2010
    Probably unrelated but when the two plugs going to the injection unit are swapped it will do funny stuff or not run. Did you buy car like this or did it develop?

    There are books on our injection system. It doesn't hurt to become your own expert.

    Sounds like it's choking on fuel, not getting enough air. Interesting. What does exhaust look like for the moments of running? Is it black?
     
  4. PV Dirk

    PV Dirk F1 Veteran

    Jul 26, 2009
    5,401
    Ahwatukee, AZ
    #4 PV Dirk, Mar 16, 2010
    Where are you located? We have people in places all over the world who may be able to drop in and give an opinion, or have a similar car to see if everything is in the right place.
     
  5. PV Dirk

    PV Dirk F1 Veteran

    Jul 26, 2009
    5,401
    Ahwatukee, AZ
    #5 PV Dirk, Mar 16, 2010
    Did someone install an incorrect fuel pump if the pressure is too high? I'm not sure what it's supposed to be off hand.
     
  6. luda123

    luda123 Rookie

    Mar 16, 2010
    7
    #6 luda123, Mar 18, 2010
    Thank you for all the feedback. It turned out that i had 2 issues. first the small screen in the fitting at the inlet of the fuel distributor was defective and causing the system fuel pressure to go high. Also the warm up regulator was not working properly and therefore causing the control pressure to be too low and flodding the system. I obtained a new fitting from the rebuilder and a rebuilt warm up regulator. that solved the problem and the car is running great.
    Thank you agian.
     
  7. Davvinci

    Davvinci Karting

    Dec 11, 2009
    162
    California
    Full Name:
    DavidoSpeedo
    #7 Davvinci, Mar 18, 2010
    Great follow up on the solution. I'm sure all the newer owners are taking note. I think so many people forget to post the actual fix for the problem looking back at the past threads. Good show.
     
  8. Mfoncerrada

    Mfoncerrada Formula Junior

    Dec 20, 2009
    419
    Monterey, CA
    Full Name:
    Miguel Foncerrada
    #8 Mfoncerrada, Mar 18, 2010
    ++1
     
  9. PV Dirk

    PV Dirk F1 Veteran

    Jul 26, 2009
    5,401
    Ahwatukee, AZ
    #9 PV Dirk, Mar 19, 2010
    Yea! Success, driving season is upon us, thanks for giving the fix.
     

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