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Ferrari (348) not accelerating properly (HELP!!)

Discussion in '348/355' started by vks, Apr 9, 2006.

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  1. Miltonian

    Miltonian F1 Veteran

    Dec 11, 2002
    5,966
    Milton, Wash.
    Full Name:
    Jeff B.
    #26 Miltonian, Apr 10, 2006
    Sorry to get away from your running problem for a minute, but why did they replace your motor mounts? What was wrong with them?
     
  2. vks

    vks Rookie

    Nov 21, 2004
    45
    LONDON
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    Viresh Sharma
    #27 vks, Apr 14, 2006
    Hi,
    I spent all day long trying to look at things and one of my air intake pipes is disconnected just beyond the arch, there were leaves stuck behind it so air intake would have been restricted. Looked at the airfilter and its all ok.
    However unplugging one of the airflow sensors just after the airfilter box the engine cuts out immediately, and unplugging the other one the engine continues idling.

    Could I have found the fault and what should be the next steps in fixing this?

    I sent a message to Richard Lukins of Rosso Corsa and surprise surprise he has still not got back to me.

    V.
     
  3. vks

    vks Rookie

    Nov 21, 2004
    45
    LONDON
    Full Name:
    Viresh Sharma
    #28 vks, Apr 14, 2006
    ... also in addition to the previous post, when i rev the engine i hear a pop:pop sound that comes out of the exhaust.
     
  4. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,205
    Mount Isa, Australia
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    Pap
    #29 PAP 348, Apr 14, 2006
    Far out man! Sounds like you have been having major dramas :( And leaves in the intake pipes?? Sh*t hey? Not sure about your airflow sensor problem sorry mate. Could go check mine,but im making lunch and my 348 is a my brothers place. :p
     
  5. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,205
    Mount Isa, Australia
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    Pap
    #30 PAP 348, Apr 14, 2006

    Um...................maybe a missfire or valve? :(
     
  6. vks

    vks Rookie

    Nov 21, 2004
    45
    LONDON
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    Viresh Sharma
    #31 vks, Apr 14, 2006
    Beginning to think it might be an electrical problem too.

    Let me know if you can test on your 348 with disconnecting the plugs to see how it idles

    V.
     
  7. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,205
    Mount Isa, Australia
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    Pap
    #32 PAP 348, Apr 14, 2006

    Ok man,after lunch,around an hour or so,if no one beats me to it,ill go check for ya. Although,from experience,the car should stall when they are both diconnected. But being a ferrari,im still learning alot about these cars,so maybe thats the way they are? :) Ill get back to ya friend.
     
  8. vks

    vks Rookie

    Nov 21, 2004
    45
    LONDON
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    Viresh Sharma
    #33 vks, Apr 14, 2006
    Thanks mate..
     
  9. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,205
    Mount Isa, Australia
    Full Name:
    Pap
    #34 PAP 348, Apr 14, 2006
    Im back, i went around,started the car and then took off the LH airflow sensor plug 1st,the car did not stall but it did drop to 500RPM at idle. I then connected it back up and the revs came good again at 1000RPM. Then i disconnected the RH side sensor plug and it did the same thing. Revs came down to 500RPM,but the engine did not stall. Reconnected it again and back to normal. Disconnect both airflow sensors,and the engine stalled of course. :p Hope this helped you out :)
     
  10. vks

    vks Rookie

    Nov 21, 2004
    45
    LONDON
    Full Name:
    Viresh Sharma
    #35 vks, Apr 16, 2006
    hey, following from AndrewG's advice earlier i cleaned all electrical connections with contact spray..

    took it around the block and it heatef up, once again its still not accelerating but i touched one of the exhausts and it was still stone cold, the other side of the engine was warm and touched the exhaust and now sitting here holding ice.. i burnt my hand. anyone offer any help?
     
  11. ernie

    ernie Two Time F1 World Champ
    Lifetime Rossa Owner

    Nov 19, 2001
    22,613
    The Brickyard
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    The Bad Guy
    #36 ernie, Apr 16, 2006
    Try disconnecting the exhaust ecu for the side that was cold and see what happens.
     
  12. andrewg

    andrewg F1 Rookie
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    Sep 10, 2002
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    #37 andrewg, Apr 16, 2006
    Hi Viresh, sorry I missed your call before (got to spend some time away from Ferrari's ;) )

    So we now know (as we both thought) one bank isnt firing properly, did you try swaping the ECU's over or remove the plugs?
     
  13. vks

    vks Rookie

    Nov 21, 2004
    45
    LONDON
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    Viresh Sharma
    #38 vks, Apr 17, 2006
    Andrew, hi and thanks for all your efforts so far.

    It got dark and I came indoors will swap ECU's over today behind the seats, looking at the workshop manual to find out location of the exhaust ECU's mentioned a few posts ago, not sure if they have fuses either so trying to read through the PDF on a tiny laptop screen

    Thanks to everyone taking time out this easter to post and help me.

    V.
     
  14. jet2911

    jet2911 Karting

    May 4, 2005
    68
    Richmond, Virginia
    #39 jet2911, Apr 17, 2006
    Hey Everyone,
    I have a 91 348. Had the same problem. Exactly. It ended up being a failure i the electrical connection to the 5-8 CATS. Had it "repaired" and all the electrical wires silicone treated. Now works fine. Once in a blue moon the problem will happen, and I will restart the car, and everything is fine. Happy driving....David
     
  15. vks

    vks Rookie

    Nov 21, 2004
    45
    LONDON
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    Viresh Sharma
    #40 vks, Apr 26, 2006
    Hi all,
    Thanks for all your input.. went to see Karl at Verdi (UK) today, great to see his mind at work.. he had it diagnosed in about 10 minutes and fixed in another 5 minutes.. it was the MAF sensor that was faulty, replaced and it drove fantastically.. took the long route home cos for once.. I finally had the ferrari

    Lets put it this way...
    Verdi - 15 mins to fix
    Rosso Corsa - 6 months and nothing!!

    In my honest opinion, Rosso Corsa ripped me off; did absolutely nothing and charged me a fortune.. Verdi sorted me out and showed me what the difference is between the Cowboys at RC and the SPECIALISTS at Verdi
     
  16. PAP 348

    PAP 348 Ten Time F1 World Champ
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    Dec 10, 2005
    100,205
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    #41 PAP 348, Apr 27, 2006
    Excellent. :D Good to have guys that know what they are doing with your baby. High five to Verdi!!! Cheers! :p
     
  17. andrewg

    andrewg F1 Rookie
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    #42 andrewg, Apr 27, 2006
    Great to hear that Viresh, told you its easier to diagnose if the cars in front of you ;) did Verdi replace the MAF or clean it (as suggested last week)
     
  18. ernie

    ernie Two Time F1 World Champ
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    Nov 19, 2001
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    The Bad Guy
    #43 ernie, Apr 27, 2006
    Glad to hear you got it sorted out.
     
  19. PAP 348

    PAP 348 Ten Time F1 World Champ
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    Dec 10, 2005
    100,205
    Mount Isa, Australia
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    Pap
    #44 PAP 348, Apr 27, 2006

    That is exactly correct Andrew :)
     
  20. SFchallenge

    SFchallenge F1 World Champ

    Jun 28, 2004
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    Jon Wijaya
    #45 SFchallenge, Apr 28, 2006
    That's a relief! Glad it's a simple, fast & cheap fix for you. Enjoy it now :)
     
  21. nationofzeros

    nationofzeros Rookie

    May 14, 2006
    23
    dreamy doncaster
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    chris elliot
    #46 nationofzeros, May 15, 2006
    Brilliant stuff guys, because my Mondial t is suffering from EXACTLY the same problem - lack of power under load beyond certain rpm depending on engine load, but still runs smoothly (on one bank I strongly suspect), occasionally clears its throat, etc etc. So manifold pressure sensor = prime suspect - and even better, its going for a holiday down at Verdis (cambelt change) next week! It doesn't come much better - thanks in anticipation!
     
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