300tdi smokey on overrun.

I have a 300tdi auto, now converted to manual. it has suffered from excessive smoking on overrun and to a lesser extent on drive when cold.
I blanked the EGR, backed off the pump timing, changed air filter and cleaned the intercooler. Prior to converting to manual the smoke was far worse especially when cold.
Now converted to manual I changed to a manual pump and did away with the fly by wire throttle, no where near as much smoke on drive when cold but still plenty when you back off the throttle.

Any ideas, injectors maybe?

Thanks

Ian

I had the same problem on a petrol turbo engine some years ago.
Apparently it was the seals on the turbo. Worth a thought.

Valve stem seals?

It's definitely diesel rather than oil smoke, it does lack power at low revs but drives fine once it get up to speed, hadn't thought of the turbo.

injectors worn and letting diesel into into the cylinder at guess thats if its not oil

Try a bottle of Forte in it and change your fuel filter.

Which Forte? They do so many.

Reduce black smoke emissions

That one.

Ignore that it says black smoke, it should clean the injectors which is one of the things that can cause the white smoke, the other things are water getting in and injector pump. Start with the cheapest fix obviously. I recently had the same trouble and the forte stopped all the panic and my head running away thinking it was going to be expensive.

Bottle of Forte ordered, I'll let you know how I get on.

Thanks

Ian

Mine does this also. but I also get a mis fire when cold. I've had the injectors checked they are good, I've replaced the piston rings as it was down on compression, I've also done the head gasket, had the valve seats recut,and the valves lapped in. also did the stem seals done. runs well but still smokes on cold start, and over run, except on wet days then it doesn't mis fire and very little smoke lol.
this was mine before the rebuild lol
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