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Thread: 2000 TD5 idling high.

  1. 10th February 2015, 06:32 PM #1
    J RAD's Avatar
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    2000 TD5 idling high.

    Gday gang. Hope everyone is doing well.

    As the title of the thread suggests the green rocket is having trouble keeping her revs down around 800rpm. I just spent the last few days knocking round northern NSW and once she gets warm to hot it idles up around 1400 and even 1600rpm!!! It is intermittent at this stage, although it is getting worse.

    If i give the throttle pedal a tap it will lower then climbs back up. My first thought was that it could be the electronic pick up on the side of the pedal getting sticky. But i must admit I'm scratching my head about it a little.

    So throw your ideas at me, I'm all ears.
    Thanks in advance. Jared.
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  2. 10th February 2015, 08:35 PM #2
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    anyone at all?
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  3. 12th February 2015, 09:43 PM #3
    BilboBoggles
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    Couple of suggestions, that are probably not it but might be worth checking.

    1 - disconnect the switch on the clutch. this controls the throttle feathering when you change gears. On a TD5 you remove it to make sure the ECU thinks you are not changing gears. I seem to recall that this could affect idle if permanently shorted, but then again I could be dreaming.

    2 - I guess it may not be the throttle position sensor, on the later ones they are a dual pot, and set up to oppose each other, if there is a difference in readings the TD5 will stay at idle and ignore throttle. So it's unlikely its the TPS.

    3 - Sensors. I'd guess a faulty Air flow meter, or some other sensor could cause this.. Not sure how though. One possibility is to start disconnecting them. The TD5 will default to a hard coded estimate, and if the fault sensor is removed the idle should return to normal.

    4 - Is your temperature gauge working correctly - if the coolant sensor detects the coolant is too cold I think the ECU will run a different map with a higher idle speed. Not sure what that will do if the engine is already hot - I suppose might cause high idle?
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  4. 14th February 2015, 10:32 PM #4
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    My guess is the throttle position sensor (this is attached to the side of the accelerator pedal assembly), some are 2 circuit, some are 3. The ECM can be programmed for either one.

    Cant remember the errors off the top of my head, you really need to get a diagnostic tool connected and see whats listed.

    Regards
    Daz
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  5. 16th February 2015, 07:45 AM #5
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    Thanks for the advise. I ended up putting a new throttle in the very next day and it's fine now. I also cleaned the maf and map sensors.

    About a year ago I got sick of having a "dead spot" at the start of the throttle so I put a tack weld on the pedal. So my thinking was I might have somehow screwed with the electronic pick up on the throttle by passing a current through it. But in saying that I'm no sparky.

    I am interested to know if you can get an idle adjustment for the td5??? I guess you wouldnt have a great need for it. Haven't found much on the web.

    Sorry for the late reply
    Jared.
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  6. 16th February 2015, 11:54 PM #6
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    A hand throttle is on the list of things to do on my dad's TD5 Defender, for some lifts we do with the hydraulic crane. Basically my thought was to get one of the pots used on the throttle and wire it in accordingly (in Parallel). Just slightly more high tech than using the current piece of wood.

    Regards
    Daz

    P.S from memory a hand throttle was an option on a TD5 but had to be ordered at factory.
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