Mark,
Before you install the 1KZ, (please) remove the EGR pipe connecting the intake manifold and Turbo and see if it is free from carbon deposits. If you find carbon it would be worth the effort to remove the intake manifold clean all the inlet ports, servicing the EGR vacuum valve, specially the area of the shaft emerging from the vacuum chamber and going into the gate. This portion of the shaft is in the open and gets rusted resulting in sticking of the vacuum valve. This eliminates the ALL VISIBLE black smoke and dirty looks from anti pollution buffs.
I will forward a chart from one of the Toyota manuals explaining how to reduce/increase fuel and also if there is black/white smoke.
Cheers,
Gibli
