Billowing grey smoke, revving up uncontrollably

[Lee horgan]

Hi guys hope your all well.

My transit van 2.2 FWD 2006 Made a loud pop whilst I was towing a trailer up an incline lost power and started smoking grey smoke.

Changed turbo, new oil supply pipe, and oil return pipe, cleaned out air intake on the manifold .

Still billowing grey smoke can an ERG valve be the problem ? 

The engine sounds good idles well and revs up good apart from the smoke