apart from gearboxes I do 99% of my own work. I just choose to let the guy at ford strip my box n rebuild/refurb it wi new proper parts.Its about the only part of engine i WONT mess about with. This egr arguement aint goin anywhere as I cant prove that it is definitely not going to improve your smoke problem & i admit that,but at the same token,you cant prove either that its going to cure your smoke. I have a feeling it'll return,but hope youre right,as Ive owned a smokey 406 & it was embarrasing to drive at times,especially in summer at nights with headlights behind me
another thing,why not just clean it all out & refit?