360 - Cylinder 6 Misfire | FerrariChat
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360 Cylinder 6 Misfire

Discussion in '360/430' started by lkstaack, Apr 9, 2022.

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  1. lkstaack

    lkstaack Formula Junior

    Dec 9, 2020
    252
    San Diego
    Full Name:
    Lars
    #1 lkstaack, Apr 9, 2022
    I noticed the engine running rough after a trip to the gas station. The Launch X431 indicates P0306, cylinder 6 misfire. I swapped the #6 and #5 coils, but the misfire didn't move. What's the next logical step I should take?

    A Ferrarichat check indicates people reporting instances of multiple misfires, but I couldn't find an instance of just one cylinder. Previous responses for multiple misfires indicate that they can be caused by vacuum leaks, spark plugs, coils, exhaust leaks, fuel injectors, fuel pressure, and evap leak. Which of these would target just one cylinder? The spark plugs only have a couple of hundred miles on them. I never top off fuel.

    Any experienced insight would be appreciated!
     
  2. flash32

    flash32 F1 Veteran

    Aug 22, 2008
    6,900
    Central NJ
    Full Name:
    Dominick
    #2 flash32, Apr 9, 2022
    First confirm the correct cylinder
    .driver side 2 in from bumper

    Remove plug and examine it for fouling

    Use a spark tester to see if coil and low voltage is working

    If all checks out ..next would be fuel injector .

    Sent from my moto g power using Tapatalk
     
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  3. Alpintourer

    Alpintourer F1 Rookie
    Owner Silver Subscribed

    Jul 20, 2013
    3,843
    The Low Country
    Full Name:
    Dave Steven
    #3 Alpintourer, Apr 9, 2022
    Recently had this problem with misfire codes on both banks. New plugs fixed it.
    I suspect they were original to the car. 19 years and 28K miles.
     
  4. MVDESQ

    MVDESQ Formula 3

    Nov 25, 2010
    1,581
    Greenwich, CT
    Full Name:
    Matthew & Kristen V.
    #4 MVDESQ, Apr 9, 2022
    If it’s a 430 the gasket between the block and headers may have deteriorated. Cheap part expensive labor fix.


    Sent from my iPhone using FerrariChat
     
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  5. Snapshift

    Snapshift Formula Junior
    Rossa Subscribed

    May 31, 2020
    923
    Centralia IL
    Full Name:
    Lyle D. Pahnke
    #5 Snapshift, Apr 9, 2022
    My 430 misfire(s) were caused by a leaking intake manifold gasket. As stated, cheap part, expensive labor. A smoke test found it and after replacement of gaskets,no CEL's. My labor wasn't too bad as I had a local indy who had some Ferrari experience fixed it in a day.
     
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  6. lkstaack

    lkstaack Formula Junior

    Dec 9, 2020
    252
    San Diego
    Full Name:
    Lars
    #6 lkstaack, Apr 10, 2022
    I want to turn over the engine without fuel being injected. Does anyone know if I should pull the fuel pump relay, or the Motronic fuse?
     
  7. flash32

    flash32 F1 Veteran

    Aug 22, 2008
    6,900
    Central NJ
    Full Name:
    Dominick
    #7 flash32, Apr 10, 2022
    Pull fuel relay .. remember if there is pressure still in system you may get a few revolutions

    Sent from my moto g power using Tapatalk
     
  8. tbakowsky

    tbakowsky F1 World Champ
    Consultant Professional Ferrari Technician

    Sep 18, 2002
    19,948
    The Cold North
    Full Name:
    Tom
    #8 tbakowsky, Apr 10, 2022
    More then likely an intake leak. Injectors rarely fail but anything is possible with the age of these cars now...definatly worth checking.

    Use smoke test or just spray some air intake cleaner around cylinder 6 intake runner while the car is idling. You will hear a change in engine tone and idle smoothness if the gasket leaking.
     
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