Ferrari 308 gtsi misfiring/overfueling | FerrariChat

Ferrari 308 gtsi misfiring/overfueling

Discussion in '308/328' started by Alexwgm1347, Oct 5, 2021.

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  1. Alexwgm1347

    Alexwgm1347 Rookie

    Oct 5, 2021
    4
    Full Name:
    Alex Merrison
    Hi guys,

    I’m new to Ferrari ownership, I’ve had my 81’ 308 gtsi for a couple of months and it’s been great until now.

    it’s backfiring, misfiring and running so rich it makes your eyes burn, it’s a us spec car which may or may not make a difference.

    it’s low on power and seems to have spark on all the cylinders so I’m not sure if it’s a fuel distributor issue but it’s a random occurrence

    thanks
    Alex
     
  2. 308 milano

    308 milano F1 Veteran

    Jan 15, 2007
    5,326
    Montana
    Full Name:
    Kim
    See if you’re dropping a bank of cylinders.
    Let it sit in cool down. Then start it and let it run for a minute and shut it back off. Then CAREFULLY Touch each exhaust header and make sure they are warm. If either one is cool, you’re only firing on one bank of cylinders. Another telltale sign is that your rubber intake boot will be dripping of gasoline.
     
  3. Alexwgm1347

    Alexwgm1347 Rookie

    Oct 5, 2021
    4
    Full Name:
    Alex Merrison
    I’m getting both banks firing as when I pull off the ignition coil leads it drops down onto one, and all the cylinders have spark but im not sure if it’s too weak or if it’s just a fuel issue
     
  4. Alexwgm1347

    Alexwgm1347 Rookie

    Oct 5, 2021
    4
    Full Name:
    Alex Merrison
  5. Alexwgm1347

    Alexwgm1347 Rookie

    Oct 5, 2021
    4
    Full Name:
    Alex Merrison
    The fact that three of the four branches are getting hotter makes me think it’s running too rich or too lean
     

    Attached Files:

  6. 308 milano

    308 milano F1 Veteran

    Jan 15, 2007
    5,326
    Montana
    Full Name:
    Kim
    #6 308 milano, Oct 6, 2021
    Last edited: Oct 6, 2021
    thorn likes this.
  7. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,794
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    Are you saying that the problem comes and goes suddenly and randomly?

    Also, are both banks of headers glowing?
     
  8. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,560
    San Carlos, CA
    Full Name:
    Mitchell Le
    Headers glowing red? For God's sake stop driving it and get someone with some tools to figure it out. You have excess fuel in the header. You need to run some fuel pressure test using CIS gauges and go on from there.
     
    Banzairacer, kiwiokie and thorn like this.
  9. mike32

    mike32 F1 Veteran

    May 13, 2016
    5,961
    Isle of man- uk
    You can get misfiring from a coil breaking down but usually the car will start fine from cold, then after a few miles down the road it will start misfiring as one of the coils warm up and breaks down. U can normally feel the difference in temp of the coils.
    Otherwise you may have problems with the fuel distributor needing a repair kit, available on e bay. Look on the side of the distributor for a bosch id plate so you get the right kit. These are fitted on volvo so easy to find.
    If engine misfire, check the engine sump oil to see if oil level is increasing or you can smell fuel on the dip stick- as it misfires the unburnt fuel goes past the piston rings into the sump. Oil will need changing as diluted with fuel.
    Distributor repair kit is a diy job if so inclined.
     
    308 milano likes this.
  10. mike996

    mike996 F1 Veteran

    Jun 14, 2008
    6,871
    Full Name:
    Mike 996
    My first reaction is an obstruction in the exhaust - collapsed muffler or Cat converter. 2nd reaction is retarded timing which can also cause it. MIGHT be fueling but, IMHO, it is less likely that the Kjet suddenly went awry than the other two.
     
  11. Banzairacer

    Banzairacer Formula Junior
    Silver Subscribed

    Aug 24, 2017
    486
    San Diego, CA
    Full Name:
    Sanjeev Thohan
    Agreed. And also as others have suggested check the coils. One of mine was firing intermittently - replaced it and it’s SOLID.
     
  12. Banzairacer

    Banzairacer Formula Junior
    Silver Subscribed

    Aug 24, 2017
    486
    San Diego, CA
    Full Name:
    Sanjeev Thohan
    run a laparoscope with a camera and check the cats.
     

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