TD4 goes into limp mode when warm at 2600rpm

Hi all,
had a few issues with the my 2004 td4 landy. Started playing up and not starting so I did the usual things and changed the fuel pump and filter in the rear wheel arch. Still wouldn't start.
Did a DIY leak off test to find 1 injector down and another leaking off a little too much. Replaced the 2 injectors but still had the same problem.

Thelandy would start when towed and would drive fine from then on, but wouldn't start on the key. It would rev right over without missing or going into limp mode so I took it to my local 4x4 place in Swansea. They diagnosed a faulty high pressure pump on the block.

So, after picking up a recon pump from Euro and a pump gear reataining tool from ebay I changed the main pump and hey presto, it now starts fine.

But.......

When it's cold it starts and drives fine,no problems, but as soon as the temp gets to half it's normal running temp on the gauge, it won't rev past 2600rpm, goes into limp mode with the 'MIL' light on. Power cuts off and the engine/exhaust notes gets louder. If I turn the ignition off/on it'll reset itself and power comes back. But again I can't go past 2600rpm.

First off I thought pressure reg on the pump as it wasn't doing this with the old pump/reg but to no avail. I've cleaned all the electrical connectors to the sensors, I've also been under the car and made sure the turbo actuator/variable vane lever is free, and the hoses aren't leaking or split.

I've had the car plugged into a Draper Expert code reader but there are no codes popping up.

Any suggestions? Temp sender? Dodgy recon pump? I'm at a total loss at the mo.
Is there a way of dis-connecting the fuel rail pressure sensor and bypassing it?

Bit of an update if anyones following.

Been through all the connections again and all are fine, so called out a mobile diagnostic chap who pulled up a P1190 error code-fuel pressure plausability.
Now as good a reputation that he has he couldn't pin-point the problem but suggested that an injector could be leaking off too much. I explained that I'd had the test done a few weeks previous and that it was fine, plus there were 2 replacement injectors in there.
So, yesterday I re-did the leak off test.
Lo and behold the ebay re-con injector is leaking off 100% more than the other 3. So, pulling the injector out and connecting this one up and pointing it at some dry blue paper I check to see how it's injecting.........it isn't!
Seems the recon injector has failed after I fitted the new high pressure pump, and only lasted all of a few days after fitting.

I put an old injector back in and the engine now revs cleanly past 3k, no MIL light and is much quieter running. I just has to set up the synergy2 again as it feels a little flat now I've changed the setting.
Worst thing is the cost involved randomly replacing parts when they are not needed. Lesson learn't-don't rely 100% re-con parts lol !!!

RonMc said:

Bit of an update if anyones following.

Been through all the connections again and all are fine, so called out a mobile diagnostic chap who pulled up a P1190 error code-fuel pressure plausability.
Now as good a reputation that he has he couldn't pin-point the problem but suggested that an injector could be leaking off too much. I explained that I'd had the test done a few weeks previous and that it was fine, plus there were 2 replacement injectors in there.
So, yesterday I re-did the leak off test.
Lo and behold the ebay re-con injector is leaking off 100% more than the other 3. So, pulling the injector out and connecting this one up and pointing it at some dry blue paper I check to see how it's injecting.........it isn't!
Seems the recon injector has failed after I fitted the new high pressure pump, and only lasted all of a few days after fitting.

I put an old injector back in and the engine now revs cleanly past 3k, no MIL light and is much quieter running. I just has to set up the synergy2 again as it feels a little flat now I've changed the setting.
Worst thing is the cost involved randomly replacing parts when they are not needed. Lesson learn't-don't rely 100% re-con parts lol !!!

Click to expand...

Good outcome, in the end - Yes, if only we could afford to only buy original new parts!

It just goes to show what can change in a matter of weeks. The injector failed days after changing the main pump and about a week after the initial leak-off-test. Lesson learnt lol re-check everything!!