Well, at least you have gone in the right direction and replaced it with a simpler more reliable engine but why didn't you use the mechanical pump on the 405? Am I right in assuming that your 306 had the EPIC pump or is it old enough not to? It certainly sounds as though you have no little or no turbo pressure, being purely mechanical it can only be either that the turbo is not running freely or the waste gate is stuck open. Bear in mind though that you won't get much from the turbo unless the engine is under load, you should be able to feel a bit while its accelerating up to full revs but once it gets there the pump throttles back and so does the boost.

Pity about the pump.

Can you disconnect the air intake hose from the manifold and see if you get a good blast of air out when you rev the engine? Have you checked the hose from the turbo to the engine for splits etc? you could have a blockage but I would have thought that would have given you black smoke. I would take the intake hose off the turbo and make sure it is turning freely, you could have some foreign matter in there that has jammed the turbo.

Have you tried driving it with the pipe disconnected, if you still have smoke I would suspect that the pump timing is out, does it start easily, is it unusually quiet or does it knock? If it runs OK, apart from turbo boost I would suspect a restriction in the air supply somewhere. You have a good blast of air from the pipe?

Right, that should eliminate turbo trouble but it certainly sounds as though you are short of air, assuming the timing is OK, I suppose nothing has taken up residence in the inlet manifold while its been standing. does it start OK?

This is very strange, if it starts without the heater plugs that woud indicate that the compression is very good, it would also indicate that the timing is about right although if its quiet that could be caused by the pump timing being retarded which would also account for the black smoke. Can you actually feel any increase in power when the turbo comes in at about 2000-2500 rpm?.

Mmm, is your lucas pump electronically controlled?

Possibly a cold advance sensor. Do any of the injectors have a wire connected to them? The pipe is for the pressure sensor in the pump that tells it to increase fuel delivery, as I think you know, if there was anything wrong there you would have a very clean exhaust, not smoke. There seem to be conflicting symptoms here. Are you anywhere near Dorset?

If you have an injector sensor it does have some measure of electronic control, so the problem could lie there, it may not be advancing as the speed increases. There should only be one injector with a wire connection. The injector sensor is a reference point for the pump. You can try having the compression tested but I don't think it is your problem. Diesels rely on good compression to start, if one cylinder was low it would run unevenly when first started and chuck out a lot of blue smoke. I would try another injector with the sensor, or alternativly fit a mechanical pump, I'm sure that would cure it..

i am using a 00 1.9d 306 ecu , my brother had to modify it a little to run the previous dturbo which was from a 306 .

it worked perfectly on the previous engine