I have a VW crafter van 57 plate have had a lot of work done to it as it kept going into limp mode.by Bosch agents in Bristol ! My problem is when going down hill on over run @ the bottom of hill when depressing the throttle pedal I get a cloud of blue smoke from the exhaust, it is then clean the van goes ok. All so at times when @ traffic lights the engine rev's go up & a lot of smoke comes out of the exhaust, I switch off the engine & restart & every thing is fine. Any Ideas
I had this issue on 07 plate 2.5l crafter after deaccelerating say like going down a hill, first touch of throttle after this would result in big puff of smoke but absolutely fine at all other times, it was the lambda sensor. changed this and it is now totally cured.only got this idea to change it from reading forums like this.