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348 cutting back...why?

Discussion in '348/355' started by Juan-Manuel Fantango, Mar 20, 2004.

  1. Juan-Manuel Fantango

    Rossa Subscribed

    Jan 18, 2004
    7,773
    Full Name:
    Juan
    My new to me 348 Challenge is cutting back, loses power and back fires, stumbles, once I hit 4-5Krpms. I noticed this earlier at much higher rpms, and was told that it was the upgraded chips that act as a rev limiter at 8600 rpms. The problem really seemed to begin in earnests once I filled the tank. I also noticed that air presure had built up in the tank when I unscrewed the fuel cap. What could it be? Once I lift off the loud pedle, it goes back to normal. Air flow meter? Fuel pump? filter? bad fuel? spark plugs? As you can see I need some experienced help. I assure you it will be appreciated.
     
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  3. bigbaddad

    bigbaddad Karting

    Oct 31, 2003
    135
    Arizona
    Full Name:
    John Roberts
    I can only comment on the pressure in the gas tank. Mine is the same, so I don't think you have a problem there. I filled up yesterday, and when I unscrewed the cap, the usual hiss of air came out.

    Can't help you on the rest, sorry.

    -John
     
  4. nzo4re

    nzo4re Karting

    Mar 13, 2003
    197
    San Jose, CA
    Full Name:
    Tom Lassen
    Do you get any warning lights like the 1-4 or the 5-8? Do you get a Slow Down light? When's the last ime you had fuel filters replaced?
     
  5. davey_jones

    davey_jones Formula Junior

    Sep 28, 2002
    781
    wherever it's sunny
    Full Name:
    Dave
  6. thecarreaper

    thecarreaper F1 World Champ
    Silver Subscribed

    Sep 30, 2003
    16,025
    Savannah
    Full Name:
    I NEED A JOB
    not to be a dud but this would garner a better response in the "TECH Q&A" section.
     
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