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Van revs up on its own and smoke pumps out?

I recently got the van serviced, new timing belt, oil and filters ETC, I thought this might cure the problem but on occasion it revs up for no reason, there is a rattle like tappets or cam shaft and smoke pumps out the back like a steam train.
Corm, January 2010
i had a customer who brought a ssangyong musso 2.9 diesel this happend to it revved up poured white smoke out it was down to them overfilling the oil check your levels

ady, January 2010
could be the electronics related to the pump(if it's the electronic type).or erratic pump timing or cold start(temp sensor)

sid, January 2010
Ford Transit 2.5 190L non-turbo

corm, January 2010
make/model/engine type/turbo/normally aspirated-would help in trying to solve your problem!!!!!!

mystic meg!, January 2010