After 45 minutes of driving on local streets, my ’87 760T wagon, (186K mi.) missed momentarily. Missed momentarily a second time about a minute later, then in another minute, the engine died, coasting to a halt off the road. Restarted car and it ran for about 5 seconds and died. Restarted again and it ran about 3 seconds. But then, no start. Tried to restart 15 minutes later, no start. Next day, car started and ran fine; fast idle, driving. Resoldered the fuel pump relay, and the radio suppression relay. Cleaned all the electrical contacts I could find. Next day, car started, idled for 5 minutes and drove for approx 15 minutes. Car died and would not start. Let sit for 10 minutes, and it started, drove home, glad not to walk.

The next day, car started, ran for 20 minutes, then died. Started immediately, idled for another 20 minutes, died. Started again, idled for five minutes, then died. Car would not restart. Inserted new fuel pump relay. No start. Let sit for 30 minutes. Still no restart. That was more than a week ago.

No sign of heated fuses or fuse panel, no sign of heated relay panel. All fuse and relay connectors are clean and tight. Tested fuel pump relay and fuel pumps, both tested ok, but no restart.

Cleaned contacts and substituted Ignition Module located in inside left front fender for a known good one. No start.

Inspected distributor which showed no signs of tracking. New plugs. Visual inspection of Hall sensor; no damage visible.

My mechanic then went to work on the car. He reports that a test light on the coil shows a solid (not pulsing) 12V on both primary terminals while engine is cranking. A Noid Light (special light with injector connectors, substituted for an injector) shows no injector squirt. A component common to *both* systems may be the key. None of the wiring diagrams we have is specific enough to show, but my mechanic is looking towards Hall Effect, or something providing RPM info to the computer, since without knowing the engine is turning, the computer will send no spark or injector signal.

Looking at the wiring harness I don’t see any crumbling insulation in critical areas, such as around the crank pulley or other visible connections, but I haven’t begun stripping the protective plastic sleeves off the wiring harness in any areas. The car continues to turn over strongly, and I have recharged the battery and tested to see that it is delivering full power. But still no sign of firing or fuel pulse into the injectors. What else should I check, or recheck?

TIA,