Dennis' comment is if you have done a carb conversion on the 4ZE1. Normally, if the fuel-injection is still in place (ITEC), then there is no vacuum line to the distributor, as the timing advance is electronically controlled.
If you've aligned the cam timing gear to TDC and it's corresponding mark, and the valve clearances are set correctly, you should be able to loosen the adjusting nut on the top side of the distributor bracket, and rotate the distributor by hand either direction (clockwise or counterclockwise) and make adjustments accordingly. Try it one direction first, and if that doesn't help, go back the other direction. If neither direction makes an improvement, reset the engine to TDC and adjust your valves first, then try the distributor adjustment again.
For the valve adjustment, if you set TDC on #4, adjust the #4 intake and exhaust, #3 intake, and #2 exhaust, then rotate the crankshaft one full turn (camshaft is now 180 degrees from where it was), and adjust #1 intake/exhaust, #2 intake, and #3 exhaust, you should be good. Valve clearances are .008 inches (.020mm).
Hope this helps.
EDIT: Corrected the order sequence of valve adjustments.
Last edited by kg4miq
on Mon Jan 02, 2017 6:02 pm, edited 2 times in total.
How to rebuild a 2.6L 4ZE1 distributor
'89 S Trooper - "Kal-El" - 4ZE1
'88 LS Trooper - "Delta" - 4ZE1
'92 Pickup - "Blacktail" - 4ZE1
'89 S Trooper - "Red Leader" - 4ZE1
'89 SE Trooper - "Vader" - 4ZE1'90 Trooper - "Leia" - 4JG2T swap on hold
'89 Pickup - "Wicket" - 4ZD1
'90 S Trooper - "Nan" - 4ZE1 (possible V8 swap - Ford 302 with 5 speed?)
'94 S Amigo - "Artoo" - 4ZE1, SOLD
'92 XS Rodeo - "Jabba", LH0, 3.1L V6
'89 S Trooper - "Chewie" - 4ZE1, TRADED
'89 XS Trooper - "Red" - 4ZE1, SOLD, bought it back'89 LS Trooper - "Obi-Wan" - LH0, 3.1L V6
'88 S Trooper - "Stormtrooper" - 4ZE1, SOLD
'91 S Trooper - "Ghost" - L32, 3.4L V6, SOLD
'89 S Trooper - "Angry Bird" - 4ZE1, SOLD
'89 S Trooper - "Phantom" - 4ZE1, salvaged
'90 Pickup - "Uno" - 4ZD1, SOLD