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Thread: Td5 "hunting" for gear change

  1. 29th June 2010, 02:50 PM #1
    Wasa57
    Wasa57 is offline Master
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    Td5 "hunting" for gear change

    Hi all

    My 2000 td5 auto Discovery (@215K) has begun hunting for upward gear change at about 2400 rpm.

    The problem is especially evident when under load, ie towing, or under rapid acceleration. A light to medium foot on throttle changes gears as normal.

    The turbo hoses have been changed, and EGR bypass done.

    I've cleaned the ECU circuit board and connections, their was a small amount of oil on the connections so I will have to replace the loom anyway. No dice.

    The auto box oil was changed at 200K and new filter installed.

    Any other suggestions much appreciated.

    -Warwick
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  2. 29th June 2010, 03:00 PM #2
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    discowhite
    discowhite is offline TopicToaster
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    get a new OE MAF.

    maf's play a big role in the autos performance.
    there are some threads in the good oil section reguarding this issue and maf kg/hr numbers.

    see here
    http://www.aulro.com/afvb/good-oil/8...flow-test.html

    cheers phil
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  3. 29th June 2010, 03:04 PM #3
    Tombie Guest
    Bad MAFs can cause issues on the AutoECU even if the car runs fine.

    Low fluid level in Trans can also cause funny shifts...
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  4. 26th July 2010, 08:18 PM #4
    Wasa57
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    Problem not MAF

    Thanks all

    I renewed the MAF today but the problem remains unchanged.

    Under rapid acceleration, the motor revs increase then decrease about every second, causing the vehicle to lurch and not change up a gear.

    With gradual acceleration, all goes well and the vehicle attains highway cruising speed (110kph.)

    It is a pain in the proverbial when overtaking, and as you can imagine not safe.

    Any other thoughts?

    -Warwick
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  5. 27th July 2010, 05:52 AM #5
    catch-22
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    Hi Wasa,

    Was it an OEM MAF as Phil suggested? Were the fluid levels checked?

    Also check your turbo modulator valve and all hoses going to it.
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  6. 27th July 2010, 07:37 PM #6
    trev
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    hunting for gear change

    Maybe the slow acceleration vs fast acceleration difference is a clue?
    Vacuum related? Definitely check turbo mod. valve.

    Trev.
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  7. 27th July 2010, 09:01 PM #7
    Wasa57
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    Thanks guys, the MAF is Britparts from Coventrys. I'll check the boost valve and hoses and report back.
    Cheers,
    Warwick.
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  8. 28th July 2010, 10:57 PM #8
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    Johnsy
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    My 03 TD5 Auto did the same on cold mornings after the EGR mod was done (thanks again Tombie) but not any other time, I checked the turbo mod valve, adjusted a turn or two (see good oil) and all was fine after that... best of luck with it, hope its a simple fix.

    Cheers,

    Johnsy
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