Defender puma overboost

Hi guys I have a 2010 defender 110 xs 2.4 tdci. It is decat and egr blanked (physically and in the ecu) and it has a stage one remap and all has been well with it for the last 18 months. But unfortunately in the last few month it has developed a misfire at 2,200 rpm and if you sit at 60/70 for a couple of minutes it will cut the turbo (limp mode) I have searching the forums for hours every day and no it seems to be a common problem. And like any Land Rover owner I have tryed to sort the problem myself. but now I have decided to throw the towel in and it’s booked in at Land Rover next week. But I’d thought I’d put a list of things I have tryed up to see if there was something obvious I had missed.



2010 defender 110 xs 2.4 tdci

For a while it’s been misfiring at 2,200 rpm and and if you sit at 60/70mph for 5 minutes it would cut the turbo out ie limp mode with a fault code of “turbo supercharged over boost”.

What I have done to try solve it.

Blanked egr. And in ecu
Intake manifold cleaned out.
Turbo dismantled and cleaned.
Intercooler hoses removed and checked.
Injectors tested.
New fuel pump (in tank may 2019)
New tank breather
New fuel filter
Map sensor replaced
MAF sensor replaced
Cam sensor replaced
Crank sensor replaced
CHT replaced
Rail pressure sensor replaced
Pressure relief valve replaced
Vcv/scv replaced

Unfortunately it won’t do the pump learn for some reason. Replacing the rail pressure valve seems to sort it but after about 40 miles it pops the valve again.

Hopefully Land Rover will have more luck

if its over boosting its turbo or actuator, ive had the actuators reconditioned and fixed it for awhile

Thanks for the reply the the turbo was in good condition when I took it apart and I had the actuator tested while it was off. To me it definitely feels like a fuelling problem

you need to reset the ecu to factory setting to do a pump learn I believe

Thank you for the reply I appreciate it. I did leave the battery off all night to try and rest the ecu and unfortunately it still wouldn’t do it. On a side note I I took the fuel filter off yesterday and turned it over (engine) and the fuel bearly dribbled out but when I have done this on td5 in the past it shot out like a hose. I’m not sure if that’s right for the puma

Two things to note; The pressure relief valve on the fuel rail is a fail once only item and has to be replaced. The fuel system has to be bled after a fuel filter change, I did a thread on this in the Puma engines section and is worth a read.

Thank you very much for the reply I will definitely check it out. The strange thing is Iv put 3 genuine prv’s in across the last couple of months and then it will drive grate for a day maybe a day and a half if I’m lucky. I don’t know what is causing them to keep failing. I don’t drive fast either but the funny thing is if I drive it hard it won’t go into limp. But if I gently go up to 60/70 and sit there for 2/3 miles I’ll go to put my foot Down to overtake and it will go into limp. Also good to know that you have to change the filter with the prv

Defender flooring said:

Also good to know that you have to change the filter with the prv

Click to expand...

I didn't say that. Was just letting you know the fuel system needs bleeding after the filter change.

Oh ok thank you I didn’t know that

Removing the battery won’t reset the ecu if you have a remap, it requires whoever remapped it to remove it or if you had it done with BAS, you get a IID tool which allows you to switch the tune off and return the truck to standard for pump,pilot and injection relearns.

Im not familiar with how Alive or similar companies do their remaps so I can’t advise on those

Thanks that’s good to know I get the bloke back to remove the map. Will it do the pump learn with the EGR blanked?