An update for everyone....
My 2002 tddi is suffering from a random drop in power. If I turn engine off then restart it's ok for a while. There is no smoke, no flashing glow plug light, no strange noises. It runs and drives reasonable, just as if there is no turbo.


So far I have changed:

1, Diesel filter, & injectors
2, Map sensor
3, egr solenoid
4, Inter-cooler sensor and Air box sensor,
5, Accelerator pedal,
6, Turbo
7, Blanked egr valve

I've checked all vacuum hoses there are no air leaks and intercooler is not blocked.

Turbo was changed today, but the old one looked fine, not clogged, spun freely.

Just one thing - I took out the flywheel sensor it was reading approx 400 ohms. Is this value correct?

I'm beginning to think it's electrical, maybe a broken wire as the fault disappears when ignition is turned off then back on.