Intermittant power loss?

Discussion in 'Tech/Mech General' started by WESTERNSTAR1, Mar 19, 2010.

  1. WESTERNSTAR1

    WESTERNSTAR1 Read Only Funster

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    HI.WE HAVE A MERCEDES 508D BASED HYMER 720 1977.
    OM314 4LTR NON TURBO DIESEL.
    DURING LAST YEARS TOURING NOW AND AGAIN IT LOSES ALL POWER,AND APPEARS TO ONLY BE RUNNING ON ONE CYLINDER.
    IF YOU FLOOR THE ACCELERATOR AND COAST A BIT IT MISSFIRES THEN PICKS UP AFTER ABOUT 30 SECONDS.
    IT DOESNT DO IT VERY OFTEN MAYBE ONE OR TWICE A DAY IN A NORMAL RUN.
    NOT GOOD ON THE MOTORWAY AND VERY SCARY ON THE PONT DU NORMANDY!
    IT SEEMS TO DO IT VERY RANDOMLY AT ANY SPEED OR AMOUNT OF FUEL IN THE TANKS.
    SOMEONE SUGGESTED MAYBE WATER IN THE FUEL?
    IT HAS TWIN TANKS.
    IM AT A BIT OF A LOSS HERE AS THIS IS OUR FIRST EXPERIENCE WITH MERC DIESELS.
    I THOUGHT ABOUT CHECKING THE FUEL FILTERS AS A STARTING POINT.
    ANYONE HAD THE SAME THING OR CAN ADVISE PLEASE?:Smile:
     
  2. Braunston

    Braunston Read Only Funster

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    Hi,

    Water in the fuel or a blocked fuel filter have got to be your first approach as these are the least expensive to resolve, you probably can deal with both by having the fuel filter changed, as normally that is where the water builds up, if you can't do it yourself it shouldn't be to costly to get a garage to change it for you

    hope that helps
     
  3. pappajohn

    pappajohn Funster Life Member

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    worth a look at your fuel lines as well.

    admittedly a petrol engine, but my old suzuki sj410 wouldnt run for very long if it was at 45+deg , off road, angles.

    turned out to be a pin hole (corroded metal pipe) in the fuel line and would draw air in if the weight of fuel in the tank wasnt pressing down on the fuel line and keeping static head pressure up.

    always did it when axle deep in stinking moorland bog mud:Sad:

    replaced the fuel line with plastic (beer pump tube) and no more problems.
     
  4. WESTERNSTAR1

    WESTERNSTAR1 Read Only Funster

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    It will take something silly to floor an sj.
    They are really superb little trucks,on and off road!
     
  5. TonyIsh UK

    TonyIsh UK Read Only Funster

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    We had a very similar problem with a Fiat 2.8JTD, It turned out to be a faulty wire connector in one of the snap multi connectors. It was a Bu**er to locate, luckily repaired under warranty.

    Maybe a spot of corrosion in a multiplug >>

    Rgds
     
    Last edited: Mar 19, 2010
  6. davejen

    davejen Funster

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    Maybe a spot of corrosion in a multiplug >>

    Rgds[/QUOTE]

    Doubt it on an old merc !!
    Cheers, Dave:thumb:
     
  7. chatter

    chatter Read Only Funster

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    errr check all fuel filters including the one located at/near the tank, we had a merc that had a similar problem and it was the filter near the tank that was blocking.
     
  8. AuldCodger

    AuldCodger Read Only Funster

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    Hi, once experienced identical symptoms on a Merc. 208, inline filters all looked good but that model had a filter in the tank pickup.
    The remedy involved removing the pickup from the top of the tank , cleaning filter, flushing tank and refitting. Over time it was amazing the quantity of muck in the tank.
    Good luck. :thumb:
     
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