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Diesel Idle Speed

Discussion in '40- & 55-Series Tech' started by bad_religion_au, Nov 27, 2003.

  1. bad_religion_au

    bad_religion_au

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    anyone got any idea why my diesel's idle is slowly increasing. lately it feels like i still got my foot half way down on the accelerator pedal, and i haven't changed anything, so i don't know why it's changed... throttle cable is not sticking (had that problem once before but have checked it this time.
     
  2. The Dude

    The Dude

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    I believe it is related to the leather diaphram on the back of the injection pump. It has a hole in it. Almost guarantee it.

    About a $25 part (don't get it at Toyota) and an hour of your time. The smaller your hands the better cuz it is a little tight to get it off/on.
     
  3. IironSika

    IironSika

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    If the idle is almost OK when the engine is cold and increasing when it warms up, it`s almost certainly the diaphram that big_blue was talkin about.
     
  4. s79bj40

    s79bj40

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    toyota is the only place which stocks them and they are about $45 for a new one. Dont even bother getting a second hand and they take only about 20mins to replace, and that only because its tricky getting your hand behind the back of the pump. I had my 4cyl at petrol consumpsion before i bothered and it was fully ripped to shreds when i took it out but boy the world of difference it made!

    Sam
     
  5. s79bj40

    s79bj40

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    sorry.... make that nearly $80 aus. I think
     
  6. bad_religion_au

    bad_religion_au

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    yeah, just found that it was the diaphram, thanks guys. getting the part monday or tuesday/
     
  7. cruiser_guy

    cruiser_guy

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    You should also drain the oil from the injection pump when you do an oil change. Some newer pumps have a one way valve to drain the oil, others have a small screw which needs to be manually removed to drain the oil. It's located about 1-2" from the bottom of the pump just forward of the diapragm.
    I've been told that draining that oil is supposed to help extend diapragm life.