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  • engine management

    I think my Ford Sierra 2 litre dohc efi may need remapping. It has become very unreliable ... failing to start and when running has flat spots under accelerarion. I have looked at all the obvious possibilities viz: distributor, cap rotor arm, plugs all of which I have renewed. Ditto the fuel filter and llamda sensor. I have checked all HT leads and battery connections and earths. Can anybody suggest other avenues to explore.

    Looking forward to any suggestions.

    Thank you

  • #2
    Re: engine management

    Could be a temperature sensor that has failed, giving wrong readings to the management unit.
    Ben Caswell probably not the last word on anything here!!

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    • #3
      Re: engine management

      Hi Andrew
      I had similar issues with mine, I found that rubber pipes to and from external fuel pump had collapsed inside due to age thus restricting fuel supply, unfortunately the pump had to replaced. I also on occasions put a tin of BG44K injection cleaner in the tank, I think it improves performance although this may be psychological.
      Regards
      Dave

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      • #4
        Re: engine management

        Is it the original Ford ECU, EEC IV?
        There are pretty basic fault code readers available that might narrow down your search.
        MOC member since 05/97
        1984 Marlin Roadster SWB.
        1800TC, Unleaded ported head, stage 2 cam. Ford Type 9 gearbox, Dolomite Sprint rear axle fitted with MGF disc brakes.
        Three core radiator, Renault Clio vented front discs.
        The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.

        Loads of Marlin Reference can be found documents here or there.

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        • #5
          Re: engine management

          I would try some injector cleaner
          Mk2 SWB Marina Roadster with a 2.0L Pinto built in 1986

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          • #6
            Re: engine management

            If you can check fuel pressure, should be 5 bar ignition on and 3 bar engine running. It sounds to me like fuel starvation and I would think you may soon need a new high pressure fuel pump.

            One other check is to carry out a throttle position sensor reminder.
            1. ignition on only.
            2. press throttle pedal fully up and down quite quickly about 10 times.
            3. switch off and WAIT a few minutes, and then start the engine.
            If your symptoms persist I would go for the fuel pump.

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            • #7
              Re: engine management

              Check / change all filters. Check fuel pressure. Check temp 1 and temp 2 sensor, AMM and plugs, the TPS and the old favourite the idle valve operation.
              Marlin Berlinetta 2.1 Efi

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              • #8
                Re: engine management

                Thank you. I have looked at fuel supply and have good flow.

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