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Thread: TD5 throttle potentiometer (TPS)

  1. 6th October 2006, 04:54 PM #1
    Lionel's Avatar
    Lionel
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    TD5 throttle potentiometer (TPS)

    Have recently experienced irregular power delivery in my 2004 Defender. Had it checked by the dealer the 1st time, and needless to say, it behaved itself and they could find no problem.

    Last Wed., driving between Ararat (Vic) & Bendigo, it started to misfire(?) again. Very persistent over distance of about 50 K's, until the orange (engine logo) warning light came on and the engine went to idle and stayed there!

    I switched off, jiggled a few connectors, re-started the engine, and the thing was back to normal.

    I am very suspicious of the TPS (this was one of the plugs I jiggled!), and would like to know what symptoms people have experienced with failure of this component. Quite a few have reported sudden loss of throttle control, but has anyone experienced apparent misfiring, or surging? The car felt like a petrol vehicle with a faulty HT lead to a spark plug.

    I'm hoping this will not be difficult to diagnose. Thank heaven the monster is still under warranty!


    Cheers,

    Lionel
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  2. 6th October 2006, 05:43 PM #2
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    discowhite
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    check 4 oil in the injector harness and at the plugs at the ecu. do a search on here and you will find a bit more about your problem.
    hope its not this, LR should have rectified the wiring harneses buy now??
    cheers phil
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  3. 7th October 2006, 05:42 AM #3
    Graeme
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    As far as failed sensors go, the TPS is the only one that can leave the engine in idle-only mode.
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  4. 7th October 2006, 10:29 AM #4
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    Lionel
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    As far as failed sensors go, the TPS is the only one that can leave the engine in idle-only mode.

    Thanks, Graeme, for this info.

    How would the clutch switch fit into this scenario? The reason I ask is that I had to have the clutch master cylinder replaced under warranty due to a fluid leak, and my engine problems started shortly after this. After the 1st occurrence, I had the vehicle checked by the dealer, but they were unable to reproduce the fault. They just checked for oil in the injector loom, and the ECU for fault codes (none).

    The 2nd occurrence was last Wednesday, and was very persistent. When the engine went to idle-only mode, I was rather spooked, and one of the things I did was to unplug the clutch switch. After I re-started, the car has been running perfectly, and the dealer suggested I leave the clutch switch unplugged until they can check everything again.

    It seems unlikely that the clutch switch could cause anything so dramatic, but what do you think?

    Cheers,

    Lionel
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  5. 7th October 2006, 05:04 PM #5
    Graeme
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    Quote Originally Posted by Lionel
    It seems unlikely that the clutch switch could cause anything so dramatic, but what do you think?
    I've had my clutch switch unplugged but re-connected it as I seemed to gain very little but prevented the revs from dropping quickly during a gear change.

    I suspect your problem is just the TPS or its connector. The connector may have been disturbed whilst the clutch master cylinder was being disconnected from the pedal.
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