Hi guys. Just wondered if anyone has any ideas on this one...
I've hot a mk7 2.2 fwd transit 2011 115, it's done 207k miles. Was getting revs surging on tickover and a diesel knock especially when cold so rather than mess about I took it to ford at chesterfield (transit specialist). They had it over night and did diagnostic. Result was injector 2 was overfueling and all injectors were out of sync so they put that right but said it needed a new injector but they are expensive from us at nearly £600 for one! I took it to a injector specialist and they replaced injector 2 and said it will more thank likely need the other 3 replacing. Van run lovely for a few days, the revs surging has gone altogether but the engine still sounds noisy when cold but quietens down when up to temperature.
Then I noticed a slight tickng when engine was ideling. This got loader so I took it back to injector place today as it sounded knackered (a bit like a knackered cam shaft sound on an old Vauxhall cavalier). He said it doesn't sound like an injector it sounds metallic? Which it did... but to check anyway he took all the injectors out and tested them, and although the new one, injector 2 had a better reading than the others he said the others weren't that bad or enough to make it run bad. He cleaned all the pipes and we checked under the rocker cover which he said looked nice and clean and couldn't see anything damaged or anything worn. He said I'll put the injectors back in but swap them round, so now new injector 2 is now number 4 as number 4 was the worsted reading. Fired it up and the ticking/knocking had gone! So to me this rules out the engine being completely knackered as it sounded sweet. But, I've noticed it's started ticking again slightly after 20miles or so, so no doubt it'll get louder....
Any one any idea what this is? Or is it just the other injectors that all need changing?
Thanks guys.