Pajero diesel when starting from cold, runs for two & half mins then cuts out, when warm starts normal

Have the cold start system checked out , It seems to be running to rich for to long .

refill the gas in the air con compressor and check for leaks....

My first thought might be a faulty thermostat, which regulates cold cycles and warm cycles in the engine. If the thermostat is faulty and the unable to switch to a warm loop after the engine warms up, it causes the engine to run much less efficiently. Whether or not it will cause the car to completely turn off, I'm not certain, but this might be one thing to mention to a mechanic.

Keep pumping the hand bleed pump on top of the fuel filter to remove all the air. when started and still a bit lumpy keep pumping and it should clear itself

sounds like it has jumped timing you'll need a mechanic or see your dealer

There is a leaking oil seal in the injection pump thereby contaminating the fuel.Usually the front oil seal.

Find the cold start switch on the engine. This unit will put more fuel into the engine and set the idle a bit higher for cold starts till warm up then go beck to normal. It appears there is a malfunction in this switch. Replace it, or you can do what I did and put a toggle switch on the power in side of this switch so that you can shut it off after it's a bit warmed up and will stay running. That's all I can imagine would cause your problem on diesel engine.

Have replaced your glow plugs?They dont cost alot to replace,try this

Well, you have to let diesels warm up before you drive them so the engine gets warm and it may not sound right at first because if its not warm the compression gets off and doesnt fire right. If you try to give it too much gas before its warm, extra diesel will get in the cylinders and misfire. Then when it does fire, there is a lot of extra fuel in it so that causes the smoke and smell. You should always let it warm up for a bit before driving when you havent driven it for a while.