TD4 gearbox fault

[TJ82]

Hey Guys,

We have a TD4 V6 and have just clicked over 300k km's. Over the past year we started getting intermittent restricted performance faults which have now turned into gearbox faults. Here's a summation of what occurs when the fault comes up:



Accelerating steadily when it gets to 70-80kmh the car revs don’t stay stable. It surges up and down around 1600 - 2000.
If the car is travelling over 80kmh and then slows down below 80kmh sometimes if you go to push the accelerator normally it will cause a gearbox fault as you speed up. If you let it fall to below 70kmh and then plant the accelerator to the floor it changes gear above 80kmh with no issue.
Driving 100kmh on the highway gives us no issues.
The really hot days, over 35 degrees, seems to cause this issue to increase. It also happens occasionally straight away after filling up fuel.
We tried on one occasion to use a diesel fuel injector cleaner which seemed to work for a short period.


Just wondering if its a gearbox issue or a fuel injection issue?

[shack]

Hey Guys,

We have a TD4 V6 and have just clicked over 300k km's. Over the past year we started getting intermittent restricted performance faults which have now turned into gearbox faults. Here's a summation of what occurs when the fault comes up:



Accelerating steadily when it gets to 70-80kmh the car revs don’t stay stable. It surges up and down around 1600 - 2000.
If the car is travelling over 80kmh and then slows down below 80kmh sometimes if you go to push the accelerator normally it will cause a gearbox fault as you speed up. If you let it fall to below 70kmh and then plant the accelerator to the floor it changes gear above 80kmh with no issue.
Driving 100kmh on the highway gives us no issues.
The really hot days, over 35 degrees, seems to cause this issue to increase. It also happens occasionally straight away after filling up fuel.
We tried on one occasion to use a diesel fuel injector cleaner which seemed to work for a short period.


Just wondering if its a gearbox issue or a fuel injection issue?It's possibly split manifolds, if you search on here for restricted performance in Discovery 4s you should get a fair bit of info.

[loanrangie]

D4 TDV6 , TD4 is the 4cyl engine . lift the engine cover and look for oil spray or black sooty deposits, you need to have the error codes read to see if its an engine fault or a transmission fault, the surging aligns with a gearbox torque converter fault but cascading engine faults can also trigger a transmission fault.

[Tombie]

You need a code reader - read the codes and report back....