Difficult starting of TD after 2 weeks leave





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  1. #1
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    Default Difficult starting of TD after 2 weeks leave

    Hi

    I've just returned from 2 weeks in Zambia. I left my Daihatsu Rocky 2.8 turbo diesel at my mates house while away. It has a mechanical diesel pump and absolutely no electronics involved in the ignition. It normally starts with the merest twitch of the starter motor, after the glow plugs have warmed up.

    But on returning home from Zambia last night, I really battled to start it! There were huge clouds of black smoke! In the end I had to just be VERY persistent with the starter motor cranking for much longer than I would like and it finally caught.

    Once it started it quickly settled down and now starts easily as before.

    Does anybody know why this is and should I be worried about it?

    The only thing I can think might have happend was that there was some sort of pressure drop in the fuel system that had to be built up again (I'm no expert in diesel ignition).

  2. #2
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    Quote Originally Posted by alanB View Post
    .........There were huge clouds of black smoke!...
    Think you need to check if your glowplugs get power.

    Maybe a relay or a fuse somewhere.
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  3. #3
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    black smoke means un burnt fuel, so i reckon that aint the problem.
    sounds like glow plugs.
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  4. #4
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    Thanks guys.

    But I'm still puzzled. Why would the glow plugs not work after standing for two weeks but then work again after the engine was started? As soon the engine started and ran for a few minutes, I switched it off and from then on its been starting at "first twitch" as it normally does.

    Could the relay have somehow got stuck or something after a long rest?

  5. #5
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    Might be a fuse or a relay...
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  6. #6
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    When standing after 3 weeks before flogging mine, it did exactly the same thing... (although maybe not as bad as yours)

    Maybe there's some resinous oil/fuel residue on the glowplugs which could have caused it and then got burnt off... pure speculation, but it never happened again so I guess glowplugs aren't the problem as such.
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  7. #7
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    maybe, just maybe, condensation somewhere leaving moisture lurking around. but i wouldnt worry about it.
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  8. #8
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    Na my mening lę jou fout by die injectors. Dit is moontlik dat die tip al slytasie op het en daarom nie meer 100% dig sluit. Die diesel in die injector lek dan uit in die silinder en raak sodoende leeg. As jy dan weer die voertuig wil start moet die dieselpomp eers weer die injectors vol diesel pomp en onder druk laat kom. Die swart rook kom van die onverbrande diesel wat op die pistons lę en van die injectors wat eerste begin spuit.
    Dit is maar net my beskeie mening.

  9. #9
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    Blou pou is close to the truth. Most diesels with mechanical injection pumps let the diesel drain back to the tank over time. When trying to start it battles to overcome the head from the tank as it is made to pump diesel and not air. If it eventually does start there is still a lot of air in the system and it will only run smooth until it has all passed through. "Die swart rook kom van die onverbrande diesel wat op die pistons lę en van die injectors wat eerste begin spuit" as blou pou said. We have the same problem on standby diesel generators. These engines battle to start if they haven't run for a while. We overcame this by putting an electric pump ahead of the mechanical pump to feed "bleed" the mechanical pump. This has sorted out the problem. You shouldn't get the problem if you drive it regularly. If you leave it for a few weeks as you did, just be sure to bleed the system before trying and it should start straight away.
    Last edited by Boyscout; 2007/10/25 at 09:49 AM.
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  10. #10
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    mine does the same when i leave it for a week or so
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  11. #11
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    Me finks this is what happened:

    What BigD said:

    • there is a small leak in the diesel feed - either low pressure side (between pump and tank) or high pressure side (between pump and injectors). I would guess on low pressure side.
    • the glow plugs warmed up, but as the pump struggled to prime the system, the glow plugs became cold (due to cold air being pumped through the cylinders)
    • by the time the pump was primed again,the glow plugs were cold, so incomplete combustion -> black smoke.
    • when it eventually started it settled down as one would expect.

    Lets try to eliminate the players:

    • glow plugs - it they were dud, they would do the same at a later start-up
    • injector tips - same as for low plugs
    • pump - ?? Once it had diesel to pump, it was OK

    PS Remember the thread about a TD not wanting to start after standing on a side-slope? Same story.

    (Me finks)

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