THANKS for the help guys,i was thinking it might be turbo sending oil into the cross over pipe .I would like to remove the big valve under the air filter,what does it do? ,will it cause any problems in the future??.I THINK ITs NOT BURNING THE FUEL PROPER sorry caps...after i changed the glow plugs and rebuilt the injectors ,fuel filters.i started it up it took a bit until air was purged out let it warm up but it feels like it bogs down (TO MUCH FUEL)when i give more fuel then causes exhaust smoke. BUT DOES SOUND BETTER NEW INJECTORS.. o2 sensor ??/CAT converter?? WHERE TO GO FROM HERE??THANK YOU RICK