306 Vivante turbo diesel won't start. It has new glow plugs and relay, exhaust is leaking badly in first section and the turbo is on the way out, but turns good thought it would at least fire up.
What things should I be checking?
There could be many things wrong here. I would start with the usual suspects, as follows:
Can you verify that fuel is getting to the injectors? What is the status of the throttle plate while the car is turning over?
Are you able to read the OBD codes set by the engine to determine failures (this might not be possible depending on the model year of the car - what is it, btw)?
How did you know that the glow plugs needed changing and can you test whether the new ones are indeed good?
While the car turns over, what is going on with the exhaust? Does the car belch out clouds of smoke when being turned over? Is anything visibly coming out of the tail pipe?