Finally found injectors are causing my problems

[Archie0979]

After some much head scratching due to no codes to work with the car has now thrown one, P1238 "injector malfunction". The mechanic needs to confirm which one is the problem once the cover is off but just by doing the screwdriver test in looks like injector 4 is sticking. This only causes an issue when the car is cold and initially warming up. Once the car is up to temperature it seems to work fine. The mechanic thinks that the injector is sticking open slightly and dumping excess fuel in the cylinder which is causing the smoke from unburnt fuel. I am on my second tank with additive which the mechanic recommended and the car is miles better. My starts are much better (normally 1st attempt but never more than 2) and as I say it is only sticking when cold (you can here the diesel knock go away once warmed up). I live in the country and need my car for the next two weeks while working night shift. Thankfully my work is a 65 mile round trip so it will get a good run and a chance to clear everything out. The mechanic said if the problem hasn't gone by then, it probably won't go away then he will look at getting a price for all 4 injectors to be sent to the local diesel specialist who repair injectors, he is also going to replace the copper washers as he suspects there is also some blow by getting caused by them as there seems to be pressure in the crankcase and its breathing heavy(purely diesel fumes, no smell of burning oil). The breather is connected to the intake housing which is dumping this residue in to my lower intercooler pipe which was initially confusing as he couldn't understand where the oily residue was coming from as the turbo is fine. Does anyone know roughly how much it costs to have 4 injectors repaired. This is the preferred option as new injectors for a 2.2 d4d cost a fortune and the car isn't really worth that.

[xzirri]

I'm glad you worked it out! Troubleshooting with no error codes can be a really tiresome process, especially when your window of troubleshooting is relatively small due to the engine reaching optimal temperature.

[ighaig]

Which diesel cleaner additive did you use ?

[Archie0979]

28 minutes ago, ighaig said:

Which diesel cleaner additive did you use ?

He has told me to use Fueltone. It is fairly new but it has had great results and reviews and it is easy to get hold of locally. He told me that ideally he would recommend Forte but it is harder to get and nowhere locally stocks it and I would need to order it off the net. This is only my first tank on Fueltone. My first tank was on Wynns but the mechanic told me that it is crap and won't do anything.