Here's a weird one with my LWB TDCi that I will try to describe accurately.
Under acceleration in any gear, I get a noise which sounds like a leak from the exhaust manifold (I am pretty sure it isn't that). If I lift off the throttle, the noise disappears Also, the noise disappears as the speed builds, again in all gears It doesn't make any difference if the van is loaded or empty and whether I accelerate gently or hard - although under hard acceleration the noise goes away sooner!!!!
I really have no idea where to start looking with this one.
Anyone got any ideas please?