Disco V8 auto box upshift hanging back 2nd to 3rd to 4th

Hi all,

Fix one thing and another problem bites you! Disco had a bit of a missfire
so I changed plugs, leads, rotor, cap etc and she runs beautifully.

Immediately after this I went for a test drive. Changes nicely from 1st to
second. Oi! wheres 3rd? I had to go up to 3.5th rpm to coax a change to 3th
and then to 4th, not suitable for suburban driving!. All gearchanging was
perfect before the ignition revamp.

So I figured I must have pulled off a vacuum tube, a cable or an electrical
lead when I changed the plugs, leads etc. I cant see any fuses allocated to
the transmission. Ive had a thorough check but all seems in order. AT fluid
also at correct level.

A very harsh upchange to 3rd or 4th can be encouraged by almost releasing
the throttle completly, and the box is very keen to change down, loves
staying in second. 1st to 2nd seems as per normal

You can imaging what this does to fuel consumption!

Any ideas most welcome, thanks in advace.

LR Discovery 1997 3.9 V8

"Jac" <[email protected]> wrote in message
news:[email protected]...
> Hi all,
>
> Fix one thing and another problem bites you! Disco had a bit of a missfire
> so I changed plugs, leads, rotor, cap etc and she runs beautifully.
>
> Immediately after this I went for a test drive. Changes nicely from 1st to
> second. Oi! wheres 3rd? I had to go up to 3.5th rpm to coax a change to
> 3th and then to 4th, not suitable for suburban driving!. All gearchanging
> was perfect before the ignition revamp.
>
> So I figured I must have pulled off a vacuum tube, a cable or an
> electrical lead when I changed the plugs, leads etc. I cant see any fuses
> allocated to the transmission. Ive had a thorough check but all seems in
> order. AT fluid also at correct level.
>
> A very harsh upchange to 3rd or 4th can be encouraged by almost releasing
> the throttle completly, and the box is very keen to change down, loves
> staying in second. 1st to 2nd seems as per normal
>
> You can imaging what this does to fuel consumption!
>
> Any ideas most welcome, thanks in advace.
>
> LR Discovery 1997 3.9 V8

There are no fuses, it's all mechanical. Check the setting and routeing of
the kickdown cable coming from the throttle linkage near the no. 7 spark
plug, it's possible you've disturbed it whilst doing the plugs.
Badger.

On or around Sun, 29 Jan 2006 11:22:09 +0000 (UTC), "Badger"
<[email protected]> enlightened us thusly:

>
>"Jac" <[email protected]> wrote in message
>news:[email protected]...
>> Hi all,
>>
>> Fix one thing and another problem bites you! Disco had a bit of a missfire
>> so I changed plugs, leads, rotor, cap etc and she runs beautifully.
>>
>> Immediately after this I went for a test drive. Changes nicely from 1st to
>> second. Oi! wheres 3rd? I had to go up to 3.5th rpm to coax a change to
>> 3th and then to 4th, not suitable for suburban driving!. All gearchanging
>> was perfect before the ignition revamp.
>>
>> So I figured I must have pulled off a vacuum tube, a cable or an
>> electrical lead when I changed the plugs, leads etc. I cant see any fuses
>> allocated to the transmission. Ive had a thorough check but all seems in
>> order. AT fluid also at correct level.
>>
>> A very harsh upchange to 3rd or 4th can be encouraged by almost releasing
>> the throttle completly, and the box is very keen to change down, loves
>> staying in second. 1st to 2nd seems as per normal
>>
>> You can imaging what this does to fuel consumption!
>>
>> Any ideas most welcome, thanks in advace.
>>
>> LR Discovery 1997 3.9 V8
>
>There are no fuses, it's all mechanical. Check the setting and routeing of
>the kickdown cable coming from the throttle linkage near the no. 7 spark
>plug, it's possible you've disturbed it whilst doing the plugs.

Bet the cable outer is unseated from the adjuster, effectively making the
cable about 1/2" short.

BTDT.

Mind, it don't half go well with a bit more kickdown - My procedure was to
adjust the kickdown cable so that with the pedal mashed into the carpet (use
a broomhandle or suchlike to wedge it there for adjustment) the kickdown
cable is fully pulled out. Note that it's a mistake on the ZF to adjust it
any tighter than that, so in practice, with the pedal mashed, you check the
cable for a fraction more movement. Don't use the end of the kickdown
travel as a throttle stop as it can bend things.

--
Austin Shackles. www.ddol-las.net my opinions are just that
"Brevis esse laboro, Obscurus fio" (it is when I struggle to be
brief that I become obscure) Horace (65 - 8 BC) Ars Poetica, 25

Thanks for your logical thinking! Turns out the kickdown cable was pulled up
from its seating on the gearbox, just a tad. I owe you beers when your
Downunder. Take care

"Austin Shackles" <[email protected]> wrote in message
news:[email protected]...
> On or around Sun, 29 Jan 2006 11:22:09 +0000 (UTC), "Badger"
> <[email protected]> enlightened us thusly:
>
>>
>>"Jac" <[email protected]> wrote in message
>>news:[email protected]...
>>> Hi all,
>>>
>>> Fix one thing and another problem bites you! Disco had a bit of a
>>> missfire
>>> so I changed plugs, leads, rotor, cap etc and she runs beautifully.
>>>
>>> Immediately after this I went for a test drive. Changes nicely from 1st
>>> to
>>> second. Oi! wheres 3rd? I had to go up to 3.5th rpm to coax a change to
>>> 3th and then to 4th, not suitable for suburban driving!. All
>>> gearchanging
>>> was perfect before the ignition revamp.
>>>
>>> So I figured I must have pulled off a vacuum tube, a cable or an
>>> electrical lead when I changed the plugs, leads etc. I cant see any
>>> fuses
>>> allocated to the transmission. Ive had a thorough check but all seems in
>>> order. AT fluid also at correct level.
>>>
>>> A very harsh upchange to 3rd or 4th can be encouraged by almost
>>> releasing
>>> the throttle completly, and the box is very keen to change down, loves
>>> staying in second. 1st to 2nd seems as per normal
>>>
>>> You can imaging what this does to fuel consumption!
>>>
>>> Any ideas most welcome, thanks in advace.
>>>
>>> LR Discovery 1997 3.9 V8
>>
>>There are no fuses, it's all mechanical. Check the setting and routeing of
>>the kickdown cable coming from the throttle linkage near the no. 7 spark
>>plug, it's possible you've disturbed it whilst doing the plugs.
>
> Bet the cable outer is unseated from the adjuster, effectively making the
> cable about 1/2" short.
>
> BTDT.
>
> Mind, it don't half go well with a bit more kickdown - My procedure was to
> adjust the kickdown cable so that with the pedal mashed into the carpet
> (use
> a broomhandle or suchlike to wedge it there for adjustment) the kickdown
> cable is fully pulled out. Note that it's a mistake on the ZF to adjust
> it
> any tighter than that, so in practice, with the pedal mashed, you check
> the
> cable for a fraction more movement. Don't use the end of the kickdown
> travel as a throttle stop as it can bend things.
>
> --
> Austin Shackles. www.ddol-las.net my opinions are just that
> "Brevis esse laboro, Obscurus fio" (it is when I struggle to be
> brief that I become obscure) Horace (65 - 8 BC) Ars Poetica, 25

Thanks for your logical thinking! Turns out the kickdown cable was pulled up
from its seating on the gearbox, just a tad. I owe you guys beers when your
Downunder. Take care

"Badger" <[email protected]> wrote in message
news:[email protected]...
>
> "Jac" <[email protected]> wrote in message
> news:[email protected]...
>> Hi all,
>>
>> Fix one thing and another problem bites you! Disco had a bit of a
>> missfire so I changed plugs, leads, rotor, cap etc and she runs
>> beautifully.
>>
>> Immediately after this I went for a test drive. Changes nicely from 1st
>> to second. Oi! wheres 3rd? I had to go up to 3.5th rpm to coax a change
>> to 3th and then to 4th, not suitable for suburban driving!. All
>> gearchanging was perfect before the ignition revamp.
>>
>> So I figured I must have pulled off a vacuum tube, a cable or an
>> electrical lead when I changed the plugs, leads etc. I cant see any fuses
>> allocated to the transmission. Ive had a thorough check but all seems in
>> order. AT fluid also at correct level.
>>
>> A very harsh upchange to 3rd or 4th can be encouraged by almost releasing
>> the throttle completly, and the box is very keen to change down, loves
>> staying in second. 1st to 2nd seems as per normal
>>
>> You can imaging what this does to fuel consumption!
>>
>> Any ideas most welcome, thanks in advace.
>>
>> LR Discovery 1997 3.9 V8
>
> There are no fuses, it's all mechanical. Check the setting and routeing of
> the kickdown cable coming from the throttle linkage near the no. 7 spark
> plug, it's possible you've disturbed it whilst doing the plugs.
> Badger.
>

On or around Tue, 31 Jan 2006 21:53:34 +1300, "Jac" <[email protected]>
enlightened us thusly:

>Thanks for your logical thinking! Turns out the kickdown cable was pulled up
>from its seating on the gearbox, just a tad. I owe you beers when your
>Downunder. Take care

hehe. BTDT,GTTS.

meanwhile, it's worth checking 2 things: a) when you floor the pedal, the
throttle actually opens fully (adjust throttle cable if required) and b)
check the kickdown cable adjustment.

certainly in the case of 3.5 autos, kickdown adjustment makes a lot of
difference to the performance. The ZFs I've had the converter stalls at
about 1800 ERPM, at which point, the engine isn't actually perfomring all
that well. Could be mine were all knackered, of course. But getting the
kickdown right made it more prone to use lower gears and get past the
bogging down effect.

It's probably less of a problem on the 3.9. I can't find the peak torque
figures at the moment, but I bet they're at more than 1800 RPM, even on the
3.9
--
Austin Shackles. www.ddol-las.net my opinions are just that
Soon shall thy arm, unconquered steam! afar Drag the slow barge, or
drive the rapid car; Or on wide-waving wings expanded bear the
flying chariot through the field of air.- Erasmus Darwin (1731-1802)