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Thread: Auto Issue On Disco 300Tdi

  1. 9th June 2013, 07:09 PM #1
    chang
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    Auto Issue On Disco 300Tdi

    Background info:

    Bought her with a snapped crankshaft at the snout so I don't know how it drove previously. Bottom end rebuild done, timing kit, hoses etc etc

    As part of my routine for a "new" car, all fluids done so it copped a trans filter kit & a flush

    Symptom:

    When in "D" & slowing to an intersection the auto clunks fairly harshly back into second just under the 40kph mark. (similar to a lot of diff backlash)

    Extra Notes:

    If I VERY slowly approach an intersection it wont happen maybe 30-40% of the time. If I select 3 on the shifter it does not occur under any conditions.

    All upshifts are fine, no problems with that at all its actually quite smooth but yet precise in all other circumstances.

    Are there any auto trans techs or experts that could help with this one
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  2. 9th June 2013, 08:02 PM #2
    redrovertdi Guest
    is the engine idle-ing to high and check kick down cable adjustment
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  3. 9th June 2013, 08:10 PM #3
    chang
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    Quote Originally Posted by redrovertdi View Post
    is the engine idle-ing to high and check kick down cable adjustment
    Got kick down spot on but it still persists. Idle is around normal at around 750 in park, 550-600 in D
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  4. 9th June 2013, 08:19 PM #4
    redrovertdi Guest
    when my kick down cable was to tight the car would snap as it changed down and it took a bit to get it right, check also the cable isnt tight in side itself, mine had gradually stiffened up and made the throttle pedal heavier but as it happened over time you dont notice until you replace[the reason for replacement was the kickdown cable was fraying at the injector pump end], way smoother changes with a new cable
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  5. 9th June 2013, 08:32 PM #5
    chang
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    Quote Originally Posted by redrovertdi View Post
    when my kick down cable was to tight the car would snap as it changed down and it took a bit to get it right, check also the cable isnt tight in side itself, mine had gradually stiffened up and made the throttle pedal heavier but has it happened over time you dont notice until you replace[the reason for replacement was the kickdown cable was fraying at the injector pump end], way smoother changes with a new cable
    yeah may have to go down that route, when I adjusted the cable it felt a bit weird at one stage (soft then hard) when pulling it up to lock the pin in & then when checking it but did not happen again.

    Would think it would effect all gears although
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  6. 9th June 2013, 08:39 PM #6
    Blknight.aus's Avatar
    Blknight.aus
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    disonnect the kick down cable and massage some lube into it. Take it for a drive with the cable disconnected.

    if it still does it I have no cheap news for you.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
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  7. 9th June 2013, 08:54 PM #7
    chang
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    Quote Originally Posted by Blknight.aus View Post
    disonnect the kick down cable and massage some lube into it. Take it for a drive with the cable disconnected.

    if it still does it I have no cheap news for you.
    here's hoping, ill give that a go first thing tomorrow & report back
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  8. 9th June 2013, 09:03 PM #8
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    you have to make sure that the cable has retracted naturally as far as it can, DONT try to push the cable back into the sheath but you can massage and flex the outer sheath. IF you massage a kink and you hear or see it click back its most definately cable drag thats getting you.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
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  9. 30th June 2013, 11:33 AM #9
    chang
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    Forgot to reply to this. Anyway the problem went as soon as the cable was disconnected. Have gave it a go lubing it & been running it for a while now with no probs except for remaining backlash in the driveline but no harsh thumping.

    Thanks for the help fellas!!
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  10. 9th August 2013, 04:32 PM #10
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    Jason F
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    Backlash

    I have a 1996 auto tdi and it has exactly the same problem. On coasting and slowing down when in D, a big thunk as it drops down to 3rd gear at just under 40km/hr. Does not always do it, but is doing it more often as time goes on.
    I've checked the backlash in the front drive shaft and at a guess maybe 9 degrees and the rear maybe 8 degrees. No difference with TC locked or not.
    I will look at the cable issue as suggested.

    Can anyone point me to which cable is the kickdown cable (I have a mechanical fuel injection system).
    Last edited by Jason F; 9th August 2013 at 04:37 PM. Reason: forgot something
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