News

360 misfire help

Discussion in 'Technical Q&A' started by SC360, Sep 10, 2019 at 12:49 AM.

  1. SC360

    SC360 Rookie

    Mar 25, 2019
    5
    san francisco
    Full Name:
    Skoty chops
    Hey guys, i have recently been trying to figure out whats going on with my car and i cant seem to find the solution. the start of the story is the car has been running really well and i dropped it off to get detailed before a show and i received a call a few days later informing me my car started to misfire and we thought maybe he got something wet and caused it, we let it sit for a few days and when restarted it ran great but after 5 min it would run rough again. we then did notice the pre cats had a discoloration on it and we figure out the cat had gave up and was clogging bank 2. i then removed the headers and gutted them out and had a mechanic look into things for me and test things, we checked all the coil packs and they came back good, checked 02 sensors and where good, did a oil change, cleaned the maf sensors, new plugs, new valve cover, timing cover and some o rings that where creating a little oil leaks. i got the car back and it was running great, sounded great etc. the next day i drove the car about 40 miles to a event and on my way home in traffic the car started to miss again and just seemed so random because it was running so well. after i got it home i ran my obd2 reader on it and came up with these codes

    p0300
    p0308
    p0306
    p0305
    p0307
    p1675
    p0432
    p0422
    p0130
    p1674

    i have a list of the trouble codes and the first 5 are related to misfires and the cylinders, i did notice its the cylinders on bank 2 cylinders 5-8 and wonder if that has anything to with figuring out the issue, my car has no pre cats or cats so there are emission codes on here. anyone have any insight on what might be going on where maybe i should start looking/ testing? any help would be grateful.
     
  2. 24000rpm

    24000rpm F1 Rookie
    Silver Subscribed

    how did you check o2 sensors? how did you check coil packs?

    you got the misfire when cold?
     
  3. tbakowsky

    tbakowsky F1 World Champ
    Professional Ferrari Technician Consultant

    Sep 18, 2002
    14,476
    The Cold North
    Full Name:
    Tom
    You possibly have and intake gasket leak. The symptoms you are describing point directly to this. Have the car smoke tested.
     
  4. SC360

    SC360 Rookie

    Mar 25, 2019
    5
    san francisco
    Full Name:
    Skoty chops
    they did smoke test it and said there was no leaks, a friend of mine mentioned that it could be one of the MAS and to swap them and see if the misfire switches sides
     
  5. SC360

    SC360 Rookie

    Mar 25, 2019
    5
    san francisco
    Full Name:
    Skoty chops
    the shop tested them and said they where good, the misfire happened when it was at operating temps and i had been driving it for about 20 min then it started while i was in traffic. i fired it up in the morning to see if maybe it went away thinking it could be the coil packs but it still had the misfire from cold start.
     
  6. Ferrarium

    Ferrarium Formula 3
    Silver Subscribed

    Jul 28, 2018
    1,156
    NJ
    Full Name:
    Eric
    Fuel air and spark that's the main things for a cylinder to fire other things can cause the ECU to read it wrong. Few things come to mind. Good luck!
    • Vacuum or other air leak
    • MAS/MAF issue
    • Injector issue
    • FPR issue
    • Coil issue
    • TPS possibly
    • Crank sensor issue
    • Cam sensor issue
     
  7. SC360

    SC360 Rookie

    Mar 25, 2019
    5
    san francisco
    Full Name:
    Skoty chops
    thank you i appreciate that, im gonna go down the list of those and check them out.
     
  8. Ferrarium

    Ferrarium Formula 3
    Silver Subscribed

    Jul 28, 2018
    1,156
    NJ
    Full Name:
    Eric
    I replaced everyone of those on my car (except the MAF which I de-corroded and cleaned). All those tend to fail over time so I replaced proactively, they were not that expensive and quite easy to do yourself. Many of those parts cross reference to other cars usually Porsches in my 348 case so you don't have to spend $750 for a part the same Bosch part is $75 usually if you shop with Bosch part numbers not Ferrari part numbers.

    Good luck!
     

Share This Page