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Home >> Ford >> 1979 >> Fiesta >> Repair and Diagnosis >> Engine Performance >> Ignition System >> MOTORCRAFT DURASPARK II Electronic Ignition >> Testing >> Intermittent Operation Test
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Intermittent Operation Test

  1. If ignition system becomes operative during testing without a repair having been made, attempt to recreate original problem. With engine running, wiggle wires at coil, module, distributor and other harness connectors. Check connections that you have previously disconnected.
  2. Check distributor ground connection. Turn engine off. Heat stator pick-up coil by placing a 250 watt heat lamp approximately 1-2 inches (25-50 mm) from its top surface. Apply heat for 5-10 minutes, while checking pick-up coil resistance at distributor Orange and Purple wires. Resistance should be 400-1000 ohms. Tapping with screwdriver may also be helpful.
  3. With engine running, heat control module in the same manner. DO NOT let module temperature exceed 212°F (100°C). If ignition system malfunctions, substitute (but do not install) a new control module. If malfunction is corrected, recheck old control module before replacing it.
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