Really...I drove this car in my garage, changed a head gasket, put her all back together and no spark...WTH? new coil...new magnetic pickup under dist. Still nothing.
Welcome to Allpar. Is the camshaft and distributor turning OK? Is spark the only missing ingredient?
Try this wiring diagram at Fig 62: http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c15280251c88
Make sure that you have the 12 volts at the Dk.Gn (or turns into Gy/Bk) out of the ASD relay to the ign coil with the engine cranking and battery 12 volts at the red wire to the ECM.
There should be either 5 or 8 volts to the various sensors and distributor pick up.
This is kind of a generic 1989 diagram, but the wire colors and ECM pinout should be pretty much the same. The Omni/Horizon is the AL-body.
Review all underhood wiring and connectors to make sure that nothing got unplugged or pinched during the head gasket change.
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