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Ignition System Starting Test

  1. Turn ignition on and remove coil wire from distributor cap. Hold end of wire 1/4" from a good engine ground. Intermittently jump coil negative terminal to ground, while watching for spark at coil wire. If there is a spark, it must be constant and bright blue.
  2. If there is a good spark, continue cranking engine while slowly moving secondary wire away from ground. Look for arcing at coil tower. If arcing occurs, replace coil. If spark is weak or not constant, or if there is no spark, proceed to "Failure to Start Test".
  3. If spark is good and there is no arcing at the coil tower, secondary voltage is satisfactory. Make sure it is reaching spark plugs by checking distributor rotor, cap, spark plug wires and spark plugs.
  4. If all of these components check okay, ignition system is not at fault. Check fuel system or mechanical engine damage.
    CAUTION: Perform "Ignition System Starting Test" first. Failure to do so may result in lost diagnostic time or incorrect test results.
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