Turbo diesel hesitating when accelerating

[airarms125]

Hi There,

I have a 2008 kia ceed 2.0 crdi and have noticed recently that when I put my foot down the car hesitates to accelerate but once it starts accelerating then it pulls hard, just as hard as it ever has.

it seems to only happen if I take my foot off the throttle and then plant it so its in WOT, if I am already accelerating a little and then plant it then it will pull well but I take my foot off the throttle and then plant it then it will hessitate for a moment before starting to pull, almost feels like turbo lag but can happen anywhere in the rev range. Its more obvious after a gear change when accelerating hard. in my head it feels like the car is taking its time to build boost again before pulling.

Just to add some more to this just recently a few times I have been accelerating hard and between 2.5k to 3k it has gone dead for a moment, almost like the turbo has stopped all together, but then it will pick it back up again and continue to pull.

I have done some research around VNT - possibly sticky vanes?
Or maybe a boost leak?
Or has the turbo just gone now?

I have cleaned the EGR valve and also the boost sensor on the top of the intercooler to rule them out.

Any help would be appreciated, air filter and fuel filter have been changed recently too. clamps on the boost pipe into the intercooler and tight.

Thanks,

[Peddlebin]

Hi airarms125, did you ever get to the bottom of this problem? What was the solution? Thanks