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Ignition Checks

WARNING: This page is about a different car, the 1997 Ford Aspire. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit identification, see appropriate wiring diagram in the WIRING DIAGRAMS article.
NOTE: If an ignition failure occurs, ignition system may operate with limited ability using Failure Mode Effects Management (FMEM) or Hardware Limited Operation Strategy (HLOS). When this occurs, trouble codes should be present in PCM memory, engine may be hard to start, and timing will not change.
NOTE: If vehicle does not start, go to CIRCUIT TEST A in the TESTS W/CODES article.

  1. Initial Inspection

    Visually inspect ignition system components and wiring for damage or loose connections. Check condition of spark plugs, spark plug wires. Repair or replace as necessary.
  2. Ensure idle speed and ignition timing are correct. Check condition of timing belt. A worn or loose belt can cause engine noise and erratic ignition timing.
  3. Ensure spark plug wires are routed in correct firing order. Firing order is 1-3-4-2. See the SPECIFICATIONS article for further information.

  4. Check For Spark

    Disconnect a spark plug wire from spark plug. Connect a Spark Tester (D81P-6666-A) between spark plug wire and ground. Crank engine and check for a strong consistent spark. Repeat test for each spark plug wire. If no spark is present, or spark is inconsistent, go to next step. If spark is okay, check fuel system. See FUEL SYSTEM  .

  5. Check Voltage To Ignition Coil

    Turn ignition off. Disconnect 3-pin connector from distributor. Turn ignition on. Measure voltage of PWR circuit at 3-pin harness connector (Blue wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open in PWR circuit. Restore all electrical connections.

  6. Check Coil Resistance

    Turn ignition off. Disconnect ignition coil harness connector. Measure resistance across coil primary terminals. Measure resistance from positive primary terminal to high voltage terminal. Compare measurement to IGNITION COIL RESISTANCE table. Replace distributor if resistance is not as specified. If resistance is within specification on, go to step 5) of CIRCUIT TEST JA in the TESTS W/CODES article.
IGNITION COIL RESISTANCE

Application Specification (Ohms)
Across Primary Terminals .05-.07
Positive To High Voltage Terminal 20,000-31,000
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