Possible boost problem
I have a small problem with the 147 that i want to sort as i don't want it turning into a big one if you see what i mean.
The issue is this, when accelerating slowly on part thorottle (like you tend to in town) particularly in 1st and 2nd when the revs reach 2500-3000 i get a slight hesitancy almost like it's missing a bit accompanied by a sort of chuff chuff noise (thats a bad description i know) like boost/vacuum being vented almost like a dump valve. This can be made to continue if you leave the throttle position alone, but if you continue through or boot it, it stops after a few chuffs... also if you back off it stops aswell? At the moment it's completely driveable and doesn't lack power as far as i can tell either at low revs or high so this would suggest the VNT is working right?
My thoughts are EGR sticking (dont really think so as i cleaned it last year and i dont think the symptoms are right)
or split VNT hose/s, i think this rev range is where actuator is in the middle of it's travel right? I looked at the actuating rod and it does move on revving the engine but not far?
Anyone got a detailed how to with pics, on changing these on the 147 JTDm, i know the 156 is simple but apparently the 147 is a bit more of a pain, typically.
Internal turbo issue, don't really want to think about that.....