Thanks for your help everyone. Finally got there. It was the fuel timing valve/plug. Completely different truck now.

Right, thanks, will check if I can see any bubbles in the coolant. Drove the vehicle 500km the other day and coolant levels look fine. Could be a small leak tho. Will keep you posted.

Hey guys, My much loved Hilux is having trouble turning over, particularly when its cold or sitting for several hours. It cranks fine, but takes a good ten seconds or so before it fires, almost as if its waiting for sufficient fuel to be delivered to the engine (you can hear it wanting to fire ...