got truck back together , finally. starts and runs fine but wouldn,t travel full speed.seeked some advise locally and found faulty air mas sensor. changed it for new , now truck travels fine just like before engine damage , but when left over night , when started it kicks out loads of white smoke which clears after a few seconds. tested glowplugs 1-3 read 0.3 ohms , no4 read 0.6 ohms. think i,ve found the problem here but any thoughts would be helpfull. cheers