Recently I adjusted the valves and cleaned the
injectors on my 84SD. Valve clearance was rechecked after
initial adjustment and all clearances were set per manual.
Exhaust at the pipe is strong and even with much less smoke
evident upon initial startup.

My problem- The SD performs as normal until about the point
where the turbo should kick in and the car goes flat.
Very poor acceleration, and I'm not hearing the familiar
noise of the turbo kicking in.

I have pulled the airsupply to the turbo, turbo impeller turns freely with no axial or radial play - all fittings - vacuum and otherwise were returned to their original locations, and no obvious vacuum leak is present.

Can you offer some suggestions as to possible
solutions.

Thank You, Glenn