Jim...this is the response from some so-called expert when asked about "no spark" on a 3vze....more for you to read!
Expert: mastertech29 replied 4 years ago.
If no spark, check for power on positive terminal of ignition coil when ignition is on. If no power, either bad ignition switch, or maybe a blown fusible link or broken connection somewhere. This post has troubleshooting info for ignition switch power:
I know you have already replaced these but it is part of trouble shooting a no spark problem.
If there is power to the coil, possibly bad coil, bad igniter, bad signal coil in the distributor, or bad connection from the signal coil to ecu or from ecu to igniter. To check the ignition coil, make sure ignition off & disconnect all wires to coil. Between positive & neg terminals of coil should be .4 to .5 ohms (that's right - about half an ohm). Between positive terminal and high tension terminal (where cable attach's) should be between 10,200 - 13,800 ohms (10.2k -13.8k ohms) COLD. Unfortunately it's possible for a coil to pass this test but still be bad. But it's not real common.
Check the resistance of all three signal coils in the distributor: they should all be 140-180 ohms cold. The green wire in the harness is the common (neg). Check for resistance between that and each of the others. (Of course, check on the wires that lead to the distributor.) Air gap between the signal rotor lobes and the signal coil projections should be .2 - .4 mm (0.008 - 0.016 in). Also try wiggling the distributor shaft side-to-side. There should be almost no movement. Check the distributor connector.
Try cleaning up the igniter ground (mounting bolts).
Does the check engine light come on when ignition is first turned on? If not, check for power on +B when ignition is on - that's your ecu power. If no, check EFI fuse on passenger inner fender, and IGN fuse in drivers kick. If the fuses are good and both are hot with ignition on, but no power on +B, then probably either bad EFI Main Relay or bad ignition switch. (If IGN fuse has no power when ignition on, then probably bad ignition switch (or connection to/from it); if IGN fuse has power, prob bad EFI main relay.)