Well just to show how temperamental these can be, I have suffered poor low down tq on my motor since I put it on the road a month ago, I know for certain as I jump in the Mrs identical motor cept it has a Bosch pump and the difference is very noticeable, put a maf amp on and it improved but was not behaving the same as my off roader, so today I swapped the maf over, and a very noticeable difference, maf amp switched off I might add for like for like testing, my test is to come up my long drive in 2nd gear at just under 1000 revs, petrols do it with ease, my Mrs tdi is virtually the only diesel that would cope, now my one does it as well, getting to your point yes mine still hesitates a bit some times at around 2500 revs, so my next job when I get time is to pull the injectors and test them, I cannot test the lift sensor on No 1, well I do not think so but will give it a go with a meter, it is on the Zexel a piezo device so on injection I may be able to detect a voltage, but do not think such a test will be valid as if the sensor was bad a code would be given, the Bosch injectors are of the "pintle" design which makes them very reliable, I have not seen a Zexel injector out yet, so watch my posts re this issue over the next few weeks, Rick