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348 running issue

Discussion in 'Technical Q&A' started by Will348, Dec 5, 2018.

  1. Will348

    Will348 Rookie

    Dec 5, 2018
    12
    Scotland
    Full Name:
    William
    Hello chaps

    My 348 has an issue and im posting here in the hopes someone can give me an idea of the “common” issues these cars have which could help identify what is wrong

    Last drive out in my car the power just went, Ive taken the car to some mechanic friends and each one of them sais there doesnt sound to be anything majorly wrong with the car, possibly fuel or electrical.

    The car hasnt dropped a bank, Put your foot down in 1st gear and its like your taking off in 4th the powers just flat

    Today im going to replace all the relays and go from there, any help will be greatly appreicated
     
  2. Ricambi America

    Ricambi America F1 World Champ
    Sponsor Owner

    Dec 7, 2003
    15,042
    Winston Salem, NC
    Full Name:
    Daniel
    Are you certain it hasn't dropped a bank?

    1) Is one of the slowdown lamps illuminated?
    2) Do the slow-down lamps actually have bulbs installed? You'd be surprised what some folks do to these cars...
     
    ernie, Wade and Pangea like this.
  3. Will348

    Will348 Rookie

    Dec 5, 2018
    12
    Scotland
    Full Name:
    William
    3 seperate mechanics have looked at it and all said both banks were running,

    the slow down lights light up on ignition but then dissapear after a few seconds

    May or may not be related but the front right headlight bucket stopped going all the way down the same night the problems with the engine started, aswell as some other electrical faults which have now been resolved other than the headlight, speaking of which has today developed another fault whereby both headlights are out of sync, the bucket on the right is up when the left bucket is down
     
  4. Will348

    Will348 Rookie

    Dec 5, 2018
    12
    Scotland
    Full Name:
    William
    The issue is permament, it a struggle to build up speed in the car so limp mode comes to mind

    When its been revved, once you stop reving the motor tends to stall

    Today ive replaced the relays, disconnected the cat ecus and disconnected the maf sensors, aswell as a ECU reset, still have the problem
     
  5. Wade

    Wade Two Time F1 World Champ
    Rossa Subscribed Owner

    Mar 31, 2006
    22,024
    East Central, FL
    Full Name:
    Wade O.
    Too many questions... e.g. where are you located, how long have you owned the car, any other recent work/events (theft, crash, flood, etc.), are your mechanics knowledgeable on the 348..........
     
  6. Wade

    Wade Two Time F1 World Champ
    Rossa Subscribed Owner

    Mar 31, 2006
    22,024
    East Central, FL
    Full Name:
    Wade O.
    Year? 2.5 or 2.7? Checked the codes? Do you have an Owners Manual, a Workshop manual?
     
  7. Will348

    Will348 Rookie

    Dec 5, 2018
    12
    Scotland
    Full Name:
    William
    United kingdom
    12 years
    One of the mechanics is a close friend whos worked on my car since i bought it.
    1993 2.7
    Yes i have the workshop manual online
     
  8. Wade

    Wade Two Time F1 World Champ
    Rossa Subscribed Owner

    Mar 31, 2006
    22,024
    East Central, FL
    Full Name:
    Wade O.
  9. Will348

    Will348 Rookie

    Dec 5, 2018
    12
    Scotland
    Full Name:
    William
    Yes in neutral it revs freely,maybe a little flat but you can get the engine high in the rev range
     
  10. Will348

    Will348 Rookie

    Dec 5, 2018
    12
    Scotland
    Full Name:
    William
    Sometimes after giving it a rev, the revs will drop so low it stalls, not every time but most of tbe time. This also happens out on the road
     
  11. Will348

    Will348 Rookie

    Dec 5, 2018
    12
    Scotland
    Full Name:
    William
    No codes yet, my car didnt have the ecu test button or loom

    On order

    Thanks
     
  12. pnicholasen

    pnicholasen Formula 3

    Jan 14, 2011
    1,250
    South of Philly
    Full Name:
    Paul Nicholasen
  13. yelcab

    yelcab F1 Veteran
    Consultant

    Nov 29, 2001
    8,453
    San Carlos, CA
    Full Name:
    Mitchell Le
    I would not ignore that electricity - headlight problem. Start with making sure your battery is good, and the alternator is good.
     
  14. Will348

    Will348 Rookie

    Dec 5, 2018
    12
    Scotland
    Full Name:
    William
    No i havent performed a compression test!

    The plugs were replaced in feb along with a new battery, ive done an alternator test and im getting just over 14v so thats ok.

    Im not ignoring it, can anybody see how the two could possibly be related or merely a coincidence the issues happened at the same time?

    Ive also been advised that although both banks are running when idling/revving, one could be dropping when driving, although the engine doesnt sound happy to start and still cuts out when the revs drop when in neutral so i really do not think i have a bank dropping under load?
     
  15. yelcab

    yelcab F1 Veteran
    Consultant

    Nov 29, 2001
    8,453
    San Carlos, CA
    Full Name:
    Mitchell Le
    Was any work (maintenance, repairs) done to the car just before the problem begin?
     
  16. Will348

    Will348 Rookie

    Dec 5, 2018
    12
    Scotland
    Full Name:
    William
    No, no work had been carried out prior
     
  17. yelcab

    yelcab F1 Veteran
    Consultant

    Nov 29, 2001
    8,453
    San Carlos, CA
    Full Name:
    Mitchell Le
    So you checked out the battery and alternator, good. Now check the fuel pressure at the fuel filters and at the injector rails.
     
  18. steved033

    steved033 Formula 3
    Silver Subscribed Owner

    Apr 12, 2017
    1,095
    Atlanta, GA
    Full Name:
    Steve D.
    has a tensioner gone bad and the timing belt skipped a tooth?

    the only way I could even possibly think to check this is to pull the valve covers off and see if the assembly marks are close to the rightplace..


    sjd
     
  19. tbakowsky

    tbakowsky F1 World Champ
    Professional Ferrari Technician Consultant

    Sep 18, 2002
    13,780
    The Cold North
    Full Name:
    Tom
    You have lost a bank of cylinders. Just because you have spark..does not mean you have fuel going to the injectors. The cat ecu will chop fuel, not spark.

    Start the car, and pull an ignition wire from one side of the engine. If you pull one from the running side, she will stall. Not so on the side that is not running.

    If found one bank is dead..start swapping components from side to side until the effected bank come back to life.
     
  20. Will348

    Will348 Rookie

    Dec 5, 2018
    12
    Scotland
    Full Name:
    William
    Thanks all for your suggestions, noted.

    The moment the power went, there was no sudden bang/noise or anything that made me think what the hell, just literally had the power zap away, i was turning at a set of traffic lights so low speed/ low rpm when it happended, there was a slight hesitation about 4 miles beforehand under acceleration ( not hard acceleration) which lasted a split second.

    i cant recall if the electrical gremlins happened at the exact same time although they werent present at the start of the journey and have been ever since, in talking headlight issues and half the dash wouldnt illiminate . A short was found which fixed the dash lights. My mechanic is under the impression the issue with the engine is an electrical one
     
  21. Will348

    Will348 Rookie

    Dec 5, 2018
    12
    Scotland
    Full Name:
    William
    I’m ordering a compression testing kit with comes with the following thread sizes

    M10 x 1.0 mm
    M12 x 1.25 mm
    M14 x 1.25 mm
    M18 x 1.5mm


    Can anyone confirm if any of these are the correct size or if not what thread size I need?
     
    yelcab likes this.

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