Jump in Acceleration - 2.4 JTDm
For a little while now I've had an issue accelerating at part throttle.
From idle to 1750(ish) rpm at light throttle in 2nd gear, I get a nice steady acceleration. Then without moving my foot, I get a noticeable surge in acceleration - almost like somebody just ran into the back of the car.
I've had to remove the swirl flaps, and have cleaned the manifold etc, but this hasn't helped.
One other issue (may not be related) is that when I accelerate hard in 3rd/4th, the boost gauge flies up to 1.2bar at 2.5krpm, hesitates there for a second or two, then flies up immediately to 1.4bar. It's can't be due to the vanes getting stuck, because it's obviously actuating to stop boosting at 1.2bar before it actuates the vanes again to get to 1.4bar.
Could these two issues be related, and if not, what could the solution to either of them be?