Hi all,
I have a 55plate jumbo 135/350 tdci, six speed, the van was running fine until last week, when I noticed that when I was driving on motorway I accelerated quite hard to overtake someone, a puff of black smoke came out of the back and also a loud noise like a blast of air was noticeable from under the bonnet, like someone turning the heater blower on full,( it would stop if i took foot off the gas) since then every time i accelerate this what i can only describe as a blast of air happens, mainly at higher speeds, seems to be ok around town unless I need to pull away quickly, then same noise and puff of black smoke,
it doesnt smoke on normal running just that first accleration, someone has suggested it may be the egr valve and someone else said it may be the viscose fan and fan assembly which appears to be a little loose not too bad though.
before I start laying out my hard earned cash, just wodered if any of you guys had any similar experiences, any help at all would be greatly appreciated ,
many thanks for taking the time to look at this post.