Auto Box Fears

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Deetd4

Deetd4

New Member
Posts
164
Location
Co. Down Northern Ireland
Hi All, Firstly Im new-ish to the forum, Discovery's and auto boxes. So if this seems stupid forgive me. I am wondering if I have a problem with my auto box in my Disco. It an 03 vehicle with 110,000 on the clock. Has a full service history with lots of receipts. As I said Im also new to automatics, When im driving along and gently push the accelerator pedal down it seems to rev a lot and build up slowly. I can let the pedal off and on without any real difference in the time it takes to increase the speed. Then she builds up to the speed and everyting is fine. It a bit like driving a car with a slipping clutch. On the other hand if I drop the pedal to the floor it just takes off with no bother at all. At times it seems to be changing a sort of "half gear" if you know what i mean. Then a minute later it changes fully. Again this is all at normal driving conditions. If you drive it like you stole it all gears change no problem and she really gets up and goes. I'm just worried there may be a problem and Im doing more harm than good at the minute........ Not sure how long ago the oil in the box was changed but as it was done in a Landrover dealership Im sure it has been done as and when it was ment to be. As I said Im new to both Disco's and automatic boxes so if this seems a stupid question forgive me.......
 
plant it and you'll be useing the kickdown.That means the gear box will probbably drop a gear(at least)and then stay in a lower gear longer to get max accerlation from that gear.Useful for overtaking etc.
 
Deetd4 said:
Hi All, Firstly Im new-ish to the forum, Discovery's and auto boxes. So if this seems stupid forgive me. I am wondering if I have a problem with my auto box in my Disco. It an 03 vehicle with 110,000 on the clock. Has a full service history with lots of receipts. As I said Im also new to automatics, When im driving along and gently push the accelerator pedal down it seems to rev a lot and build up slowly. I can let the pedal off and on without any real difference in the time it takes to increase the speed. Then she builds up to the speed and everyting is fine. It a bit like driving a car with a slipping clutch. On the other hand if I drop the pedal to the floor it just takes off with no bother at all. At times it seems to be changing a sort of "half gear" if you know what i mean. Then a minute later it changes fully. Again this is all at normal driving conditions. If you drive it like you stole it all gears change no problem and she really gets up and goes. I'm just worried there may be a problem and Im doing more harm than good at the minute........ Not sure how long ago the oil in the box was changed but as it was done in a Landrover dealership Im sure it has been done as and when it was ment to be. As I said Im new to both Disco's and automatic boxes so if this seems a stupid question forgive me.......
Click to expand...


To understand what is going on, you need a bit of info about autoboxes.

They have two main components, the gearbox itself with 4 forward gears and also something called a Torque Converter (TC). The TC is a sort of clutch which helps the 'box to change gears.

However once you get to about 52mph, in 3 or 4th (on a Disco2) gear the TC "locks-up" and so you get a form of direct drive.

So, in practice the revs rise and fall directly in relation to the pedal pressure below about 50mph. Above that speed the revs feel much more normally related to road speed.

Hope that makes sense? Your box behaviour sounds normal.

Cheers
Dave
 
thebiglad said:
To understand what is going on, you need a bit of info about autoboxes.

They have two main components, the gearbox itself with 4 forward gears and also something called a Torque Converter (TC). The TC is a sort of clutch which helps the 'box to change gears.

However once you get to about 52mph, in 3 or 4th (on a Disco2) gear the TC "locks-up" and so you get a form of direct drive.

So, in practice the revs rise and fall directly in relation to the pedal pressure below about 50mph. Above that speed the revs feel much more normally related to road speed.

Hope that makes sense? Your box behaviour sounds normal.
Click to expand...



Dave thanks for your reply, you have put my mind at rest. I was really starting to panic that there was something major wrong in the gearbeg. What you say is exactly what is happening. Below about 50mph lots of revs and over 50mph more responsive to pedal movement............

Thanks..........
 
Deetd4 said:
Dave thanks for your reply, you have put my mind at rest. I was really starting to panic that there was something major wrong in the gearbeg. What you say is exactly what is happening. Below about 50mph lots of revs and over 50mph more responsive to pedal movement............

Thanks..........
Click to expand...


If I may, I'll offer you a couple of tips that will help with efficient running of your Disco.

IF you don't already know how to do it, learn how to do oils and filters changes and you'll keep your new baby in tip-top and avoid breakdowns.

I'm referring to engine oil and filter, air filter (very important for good mpg!!) the 2 gearboxes and their oils and the axle oils.

When you do these yourself, they tend to be done more regularly as you're not having to pay someone to do them, so your motor is always running with clean oil - very good thing.

When you want to know more just ask. But change that airfilter straight away, your pocket will thank you.

Filter Kit - Disco TD5

Cheers
Dave
 
OK here's another silly question, is the a dip stick for the auto box? Can the level be checked easily or is it a case of undoing a level bung on the gearbox and checking it that way? I think I will drain the box and refill it with new oil, is it just a matter of taking the drain plug out like on an engine or is there a special way to drain/refill an auto box.
 
If you're new to auto boxes, it's worth remembering that they don't all feel the same. Because the Disco is so big and heavy (and because you can hear the engine) you seem to get quite a lot of slip. With some weight in the back on twisty roads it can seem as though the engine is either "on" or "off", with revs having no relationship to road speed. You may get a more "normal" feel if you press the S button, but you'll also use a lot more fuel. In contrast, if I have to drive my wife's Astra auto (I try not to have to) I need to be really careful not to accelerate into the car in front - the car is so much lighter and the petrol engine more responsive, that there is hardly any "slip" evident at all.
 
hi guys
I've had discos for the past 10yrs and had my current 2000plate Td5 (85,000) for 4yrs. The auto box has recently started doing similar things to what dee describes above.

It was unning normally up until last week, but then one a run it started revving much higher than usual before changing up and then on the motorway got stuck in 3rd and just refused to budge up into 4th. I pulled over, restarted the engine and the auto box reverted to normal i.e. not revving as high and shfiting into top gera without any arguements.
Since then it's done the same thing 2 or 3 times, clearing the problem if i restart the engine

any thoughts!!

cheers
 
wilf1234 said:
hi guys
I've had discos for the past 10yrs and had my current 2000plate Td5 (85,000) for 4yrs. The auto box has recently started doing similar things to what dee describes above.

It was unning normally up until last week, but then one a run it started revving much higher than usual before changing up and then on the motorway got stuck in 3rd and just refused to budge up into 4th. I pulled over, restarted the engine and the auto box reverted to normal i.e. not revving as high and shfiting into top gera without any arguements.
Since then it's done the same thing 2 or 3 times, clearing the problem if i restart the engine

any thoughts!!

cheers
Click to expand...
We had this problem on the first auto I ever drove (a Bedford CF van). We never did fix it, but I've been on the lookout ever since for possible explanations. Most votes seem to go for dirt in the fluid. I've been told the box operation depends on a lot of small holes and if the fluid is dirty they can block up and affect the changing. That's why the box has filters in it and why, strangely, changing the filter can cause problems - disturbing the old filter can dislodge dirt.

That said, the TD5 has a lot of electronics and the fact that it works OK when you reboot makes me wonder whether you have a sensor or a chip problem - after all that's what will kill them all off in the end, I reckon.
 
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