I'm a little confused?
Black smoke, or diesel misfire?
What are the problems with the car? A misfire while revving at 2200-2800 stationary is normal on this engine, or is it missing under load?
How was the depression valve checked? the little filter, or the depression valve itself? why wasn't it just changed?
When does it smoke? normal driving? under acceleration?
regards
Steve
Regards
Steve