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Thread: Nervous Tacho needle 300TDI

  1. 31st October 2011, 05:00 PM #1
    FireFox
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    Nervous Tacho needle 300TDI

    My Tacho needle started jumping around 500 revs either side of actual revs and sometimes dropping right off, while i was driving the other day.... Any Ideas??? ( loose wire or does the 300tdi have a crank angle sensor?)
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  2. 31st October 2011, 05:15 PM #2
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    isuzurover
    isuzurover is offline Swaggie
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    Check the wire on the back of the EDIT Alternator That was the problem with mine.
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  3. 31st October 2011, 06:39 PM #3
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    4bee
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    Check the wire on the back of the distributor. That was the problem with mine.

    Eeerr, Dizzy or Alternator?
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  4. 31st October 2011, 06:49 PM #4
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    seano87
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    The tacho on the 300Tdi gets its reading from the (?K) terminal on the back of the alternator. If its loose or a bit crusty, the symptoms you describe are spot on how it acts.

    give the terminal and wire connection a good clean and make sure its nice and secure. Pretty likely that's all it'll need!
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  5. 31st October 2011, 10:26 PM #5
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    Terrain Vehicles
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    Be warned, it is often a sign of pending alternator failure..
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  6. 31st October 2011, 10:48 PM #6
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    awabbit6
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    I had a similar problem when I had my 300Tdi Disco. I solved it be removing the tacho and re-soldering all of the joins on the back of it. It never played up again.
    -- Paul --


    | '99 Discovery Td5 5spd man with a td5inside remap | doesn't know what it is in for ...
    | '94 Discovery Tdi 5spd man | going ... GONE
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  7. 1st November 2011, 01:12 AM #7
    micko
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    Hijack

    Sorry for the hijack but I noticed my speedo doing this a couple of weeks back. Sitting on 105-110 it'd suddenly drop back to 70ish then spring straight back to where it should be.
    Any clues???
    ta
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  8. 1st November 2011, 06:04 AM #8
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    zuno555
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    Quote Originally Posted by micko View Post
    Sorry for the hijack but I noticed my speedo doing this a couple of weeks back. Sitting on 105-110 it'd suddenly drop back to 70ish then spring straight back to where it should be.
    Any clues???
    ta
    Same problem, different wire.... Crawl under your car to the t-case, there is a wire where the speedo gets its signal. This is probably loose/about to fall off. If it is very loose grab some pliers, give the spade a slight twist, this will make the connection a lot tighter.

    At least that was the problem when my tacho and speedo began to dance on different occasions
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  9. 1st November 2011, 05:54 PM #9
    micko
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    Legend!! Cheers mate.
    Geez I love this place, makes owning a Landy much easier
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  10. 1st November 2011, 07:01 PM #10
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    shining
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    I agree that it can be the sign of a failing alternator (personal experience) but can also confirm the poor connection in the instrument binnacle. My Tacho needle regularly fluctuates or fails. I fix by flicking the centre bottom of the tacho with my finger (never fails)...when it does completely fail I will resolder. Same same for the speedo although mine was more the sensor connection (which I don't flick on the move :-))
    Last edited by shining; 1st November 2011 at 07:03 PM. Reason: typo
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