Hello, engine started to run a little lumpy on start up.Two days later I noticed the talepipe had been bent forward squeezing the pipe 75% shute.I then remembered reversing onto a very steep drive a few days earlier and hearing the graunch.Bent piped sorted.I now have a fair amount of white- bluish smoke.Will this clear up or has serious damage occured.Injector pump was re-built about 45k ago. Thank you Richard