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355 hard to start

Discussion in '348/355' started by 355tsr, Sep 23, 2010.

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  1. 355tsr

    355tsr Formula Junior

    Mar 9, 2010
    322
    #1 355tsr, Sep 23, 2010
    any ideas welcome ...when cold it cranks over as usual just will not start, I crank over 8-10 times turn the key off crank again 5-6 times turn the key off 3rd time will start on the 4-5 roll. when hot it will usually start on the 5-6 roll. this just started last week, before it would always start on the 2 or 3 rollover. I have reset the ECU and that helps on the first time but after it warms up it goes right back to hard to start.
     
  2. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,210
    Mount Isa, Australia
    Full Name:
    Pap
    #2 PAP 348, Sep 23, 2010
    Replace both fuel pressure regulators. ;);)

    When a car sits, the fuel pressure regulators work as "one way valve" and hold pressure in the fuel rails so the injectors always have full fuel pressure there at all times to start the car. :):)

    When the fuel pressure regulators are old/worn out, the rubber diaphram inside them tends to leak and you lose fuel pressure in the fuel rail. :):)

    So you have to crank your car a few times to build fuel pressure back up in the fuel rail to start the car. :D:D

    So replace both those FPR's (fuel pressure regulators) and that should fix your problem mate. :D:D

    Its actually a pretty common issue on the 355. Actually................ a common issue on almost EVERY car in the world, especially over time. :eek::eek:
     
  3. sambomydog

    sambomydog Guest

    May 23, 2009
    1,380
    #3 sambomydog, Sep 23, 2010
    Agree with pap on this.
     
  4. 355tsr

    355tsr Formula Junior

    Mar 9, 2010
    322
    #4 355tsr, Sep 23, 2010
    wher on the car are they located
     
  5. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,210
    Mount Isa, Australia
    Full Name:
    Pap
    #5 PAP 348, Sep 23, 2010
    You're mad if ya dont. :eek::eek:
     
  6. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,210
    Mount Isa, Australia
    Full Name:
    Pap
    #6 PAP 348, Sep 23, 2010
    Last edited by a moderator: Sep 7, 2017
  7. 355tsr

    355tsr Formula Junior

    Mar 9, 2010
    322
    #7 355tsr, Sep 23, 2010
    thank you PAP gives me a good place to start
     
  8. tcbquattroporte

    tcbquattroporte Karting

    Jan 31, 2014
    132
    New Mexico
    Full Name:
    Tom
    #8 tcbquattroporte, Oct 5, 2019
    My 1995 Spider has developed the same cold start issue described in this thread. As Ferrari apparently no longer makes these available, the only fuel pressure regulators I have found are $800-$1,000 each. Does anyone know of another fuel pressure regulator that will work for a reasonable price, or should I just install aftermarket adjustable regulators?
     
  9. Beetle

    Beetle Formula Junior

    Apr 10, 2013
    776
    #9 Beetle, Oct 5, 2019
    Why would you just replace them??? Would'nt you test the fuel pressure first?. Fuel, Spark and Air?? Firstly test/check fuel pressure. 2nd Put a timing light on the engine and crank it. It wont matter what lead you put it on to check you have spark, Check all leads. If you have no spark check relays and fuses then crank angle sensor. Not trying to disrespect anyone's suggestions but fuel regs for these cars are super expensive if you can get them. Why spend if you have'nt tested and checked first. What version 2.7 or 5.2?
     
  10. Jackie and bill

    Jackie and bill Formula Junior

    Nov 29, 2014
    795
    GB
    Full Name:
    William
    #10 Jackie and bill, Oct 5, 2019
    Wow, them regulators have gone up in price. 9 years ago when this thread was originally asked, they were £80.
    Superformance now sell them at £400.
     
  11. johnk...

    johnk... F1 World Champ
    Owner

    Jun 11, 2004
    11,199
    CT
    Full Name:
    John Kreskovsky
    #11 johnk..., Oct 5, 2019

    You would think, wouldn't. But he read it on FChat, so it must be right. :rolleyes:
     
    Beetle likes this.
  12. Beetle

    Beetle Formula Junior

    Apr 10, 2013
    776
    #12 Beetle, Oct 5, 2019
    Don't even know why I replied hahahaha I didn't read when the thread started 2010?? Hopefully it's fixed now
     
  13. Jackie and bill

    Jackie and bill Formula Junior

    Nov 29, 2014
    795
    GB
    Full Name:
    William
    #13 Jackie and bill, Oct 5, 2019
    Probably fixed because it was the regulators as suggested above on fchat ;)
     
    Beetle likes this.
  14. johnk...

    johnk... F1 World Champ
    Owner

    Jun 11, 2004
    11,199
    CT
    Full Name:
    John Kreskovsky
    #14 johnk..., Oct 5, 2019
    Last edited: Oct 5, 2019

    Weren't replying to post #8, which was made today, 10/5/2019? :confused:
     

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