Quote Originally Posted by brush View Post
quick update: took off distributor cap, and attempted to turn rotor. does not move, except some wiggling of the rotor on the spindle. am i correct that rotor should be able to be rotated by hand, on the order of ~20 degrees or something, and then spring back when released? does that happen on your working truck?
That would be correct if your dizzy has mechanical advance, but AFAICT from the exploded diagrams in Haynes, looks like the '89-on FI engines had no advance (vac or mech) built into the dizzy at all.