FMB

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  • djj_engineer
    club member
    Club Member
    • Nov 2011
    • 405

    #1

    FMB

    I seem to have a problem.
    The plugs on the left bank are white (lean) on 1 & 4 and Black (rich) on 2 & 3.
    Those on the right bank are white on 2 & 3 and black on 1 & 4
    The left is Nearside.
    I am at the moment looking at the ignition system and will concentrate on the distributor.

    I don't think it can be head-gasket or carbs as they don't seem to fit the outcome.

    The latest start, and FMB seemed Ok until it suddenly wouldn't tickover.
    I will investigate later this am to see if I can spot anything that may cause the symtoms
    DJ
  • cameronfurnival
    • Nov 2011
    • 2142

    #2
    Re: FMB

    Hi Derek, are you running the SU carb set up? A common cause of weird rich/lean running is often down to PCV/ crankcase ventilation systems believe it or not. I'm sure you will have addressed the infamous Rover V8 crossfire problem if leads 5 and 7 are parallel?

    Comment

    • philcoyle
      • Nov 2011
      • 379

      #3
      Re: FMB

      Always worth clamping off the pipe to the servo just in case the servo has sprung a leak and allowing air in to weaken the mixture on one bank, but don't drive it anywhere!

      Comment

      • djj_engineer
        club member
        Club Member
        • Nov 2011
        • 405

        #4
        Re: FMB

        Hi Guys
        Ta for the thoughts.
        It was the Lumination Ignition unit. I swapped it for the other one on the car and the normal tick-over returned.
        All i have to do now is figure out how I fixed the old one so that I can replace it with the one that works,
        cheers
        DJ

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        • greyV8pete
          club member
          Club Member
          • Nov 2011
          • 1618

          #5
          Re: FMB

          Hi Derek. That kind of makes sense since if you plot your black/ white plug colours against the V8 firing order 1 8 4 3 6 5 7 2 it suggests that the ign module is only firing properly on every other cylinder. Glad you sorted it out. Peter.

          Comment

          • djj_engineer
            club member
            Club Member
            • Nov 2011
            • 405

            #6
            Re: FMB

            Hi Peter
            Yep that was my thought. I concentrated on the Ignition side. I couldn't couple the plug colour with any other cause.
            If it been one bank I might have thought head-gasket, but it wasn't, thankfully!!
            Derek

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