I have a d16z6 and im having to adjust my dizzy fully advanced and it would still be retarded? ive checked the TDC and its dead on. vaccum lines good no leaks.. what could be causing this? or if anyone else has had this issue?

 

Triple check everything to be on tdc, sometimes single cams can fool even the best of us when it comes to TDC settings.

If everything looks ok, try a different distributor assembly.