Hi guys iv got a disco 01 td5 manual
1. First problem is the turbo wastegate keeps getting jammed, after removing the actuator and spraying Dw-40 near the lever it frees up and moves back and forth freely a few times then James up again... Gets stuck when it's on the open or closed position

2nd. The engine seems to be a little bit louder, more noticeable when changing from first to second (sounds like rubbing the side of a empty cardboard box) and seems to have a bit more black smoke on take off and a stronger smell of exhaust fumes on start up.
Any suggestions guys??