Thread: TD5 Power Box Tuning Problem

I have just installed a DieselTorque power box made by Vector Tuning in Germany. My car is a Defender TD5 CSW 1999 model. The power gain is very good with no smoke. It pulls much better on the open road.
The problem is that the engine dies sometimes. It is as if the injectors are switched off one by one untill the car stalls.
I switch off and restart then it runs well again for sometimes a day or two. It seems to happen only in town at low to mid revs. It has never happend on the open road. The engine does not over boost (I have a boost guage fitted). The manufacturer has suggested moving the jumper to a lower setting but that did not help. I had the box exchanged by DieselTorque but that did not help either.
Without the box the engine has never cut out while driving. And no, there is no oil in the wiring harnass or on the ECU plug!
The Box seems to work in another Defender.
Where do I start finding out why my TD5 does not like the Tuning Box?

I cannot remap since my ECU is 1999 model. Had Autologic test my ECU and sensors and it found my airflow meter open circuit. It also found all my injectors open circuit!??? This morning I replaced the injector loom and the airflow meter ($$$$!!). My injector codes are all correct. Wrote them down when I changed the loom. All fault codes now cleared and now I must put the Tuning box back and see what happens.