My 04 TDCI Sport, 47000m, keeps going to limp mode with glow plug light flashing, especially after 3000 revs. It seems to hit a limiter and go to limp mode, and on 2 occasions has cut out completley.

I have tried new accelerator pedal, new crankshaft sensor and new camshaft sensor, nothing has helped. I got bluefin which is showing no fault codes. Still the same even with bluefin map off. Car is ok after turning off then on again, but that can't go on!

Dad is a mechanic and even he is stumped...

Any ideas?

Cheers