Hard bucking under heavy throttle?

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  • APhelps89
    Member
    • Sep 2008
    • 60

    #1

    Hard bucking under heavy throttle?

    Running auto-x last month I ran into the problem of having the car almost feel like it was hitting a brick wall between 75-90% throttle and its only when Im heavy on the throttle that it cuts out for a quick second then runs fine. I cleaned the throttle body, AFM and replaced a crack air boot between the two, it cleared up for a bit and came back just not as bad.

    What would anyone suggest from the described symptoms that could possibly clear this up (i.e. specific places to check for leaks or if its spark, fuel, or air leak)

    Im running a tight budget and I would really like to have this solved by next weekend in order to run another auto-x, so I only have the budget and time to change something or fix one of the three fuel, vacuums, or spark. Any help would be greatly appreciated

    tia
    sigpic
  • OrganicMechanic
    E30 Mastermind
    • Jan 2008
    • 1719

    #2
    fuel filter

    join the E30 Cabrio owners gruppe
    click here for details


    Comment

    • 87e30
      R3V Elite
      • Jul 2008
      • 5676

      #3
      Originally posted by OrganicMechanic
      fuel filter
      At least this one is cheap, easy, and fast. Don't know if that's the problem or not though.
      Originally posted by z31maniac
      I just hate everyone.

      No need for discretion.

      Comment

      • lifeiskaos
        E30 Mastermind
        • Dec 2007
        • 1709

        #4
        test your AFM and check your power/grounds

        Comment

        • Spinning Tires
          Wrencher
          • Feb 2007
          • 283

          #5
          Maybe ignition wires. My buddies car did that and a few months later caught fire
          First: 1984 318i
          Second: 1987 325
          Third: 1987 325is
          Current: 1990 325i (Soon To Be 335i)

          Comment

          • I got it, yes!!
            Wrencher
            • Feb 2007
            • 206

            #6
            Mine was doing this and i had a loose connection on an injector. Try checking with a noid light.

            Comment

            • APhelps89
              Member
              • Sep 2008
              • 60

              #7
              my ignition wires were shot, got them changed and everything cleared up.

              Thanks for everyone's help
              sigpic

              Comment

              • kenika65
                E30 Fanatic
                • Aug 2007
                • 1336

                #8
                Auto-xing with crap wires um I guess you didn't want to win

                1986 325es (69k) Garage Queen Buy It Now 10k;1986 325es (track rat) 2.7i How-To & 1.1/1.3Motronic UpGrade
                1991 318is (daily driver) 1991 318is M42 Maintenance How-To;1989 325i (parts car)

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