Here we are twelve years after your post, and more importantly, twelve years after the solution to your van's problem, and you've been able to help me out!
My van, a 2009 Mk7 2.4 diesel, was hesitating when accelerating under a light throttle but no problem under a heavy throttle. There weren't any warning lights and no codes so it was a case of trial and error to sort out the problem. The injectors and egr valve had recently been done, no splits in the turbo hoses, flushed the intercooler and no leaks there, had disconnected the turbo actuator and the lever for the turbo vanes moved easily, so I was thinking it was the actuator.
A quick trip to the local Ford mechanic, he took it for a drive and said the turbo actuator would need replacing. Not a cheap item and I'd already bought a second-hand one from the wreckers which hadn't made any difference, so I started digging around online for some clues. That's when I came upon this thread, and your solution... Straight out to the van, disconnected the MAF sensor, and went for a drive; the van had never run better! Drove the the local autoparts store for a new sensor, fitted it while in the carpark, and drove home with no issues and a big smile on my face.
Thank you to everyone who contributed to the post.
