Rough idle, and stuck under 2000rpm

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  • EndreM
    E30 Addict
    • Jul 2009
    • 513

    #1

    Rough idle, and stuck under 2000rpm

    Hi guys.
    I just bought a new E30, and drove it 700kms without big problems, but ten minutes from where I live, it suddenly lost power.

    It wont go higher then 2000rpms, and if I push it, it stutters and backfires out of the intake.

    Any ideas?

    The car is a 1986 320i
    '91 E30 316i
    '97 Rover Mini 1275
  • jlevie
    R3V OG
    • Nov 2006
    • 13530

    #2
    The first thing I'd check would be rail fuel pressure and delivery rate from the FPR.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

    Comment

    • EndreM
      E30 Addict
      • Jul 2009
      • 513

      #3
      Thanks, Ill have to check it later today.
      I changed the fuel pump, as it was really noisy, but it didnt help.

      I cant wait to drive this car!
      '91 E30 316i
      '97 Rover Mini 1275

      Comment

      • jlevie
        R3V OG
        • Nov 2006
        • 13530

        #4
        You still need to check rail fuel pressure.
        The car makes it possible, but the driver makes it happen.
        Jim Levie, Huntsville, AL

        Comment

        • EndreM
          E30 Addict
          • Jul 2009
          • 513

          #5
          Yeah, I know. Im going to steal my friends FPR tomorrow, and see if it helps.
          '91 E30 316i
          '97 Rover Mini 1275

          Comment

          • EndreM
            E30 Addict
            • Jul 2009
            • 513

            #6
            Any other ideas in case its not the FPR?
            '91 E30 316i
            '97 Rover Mini 1275

            Comment

            • jlevie
              R3V OG
              • Nov 2006
              • 13530

              #7
              Originally posted by EndreM
              Yeah, I know. Im going to steal my friends FPR tomorrow, and see if it helps.
              That is not a substitute for connecting a gauge to the supply line to the fuel rail. What you are contemplating is "throwing parts at the problem while hoping for a favorable outcome". Get a gauge, tee it into the supply line to the rail, and see what the rail pressure is when you try to drive the car.
              The car makes it possible, but the driver makes it happen.
              Jim Levie, Huntsville, AL

              Comment

              • EndreM
                E30 Addict
                • Jul 2009
                • 513

                #8
                Thanks for helping out, it was the AFM that was acting up.
                The parts I replaced desperately needed replacing anyway, but I see your point.
                '91 E30 316i
                '97 Rover Mini 1275

                Comment

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