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Home >> Plymouth >> 1995 >> Grand Voyager Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 3.8L >> Ignition Checks >> Testing Spark At Coil

Testing Spark At Coil

WARNING: Direct Ignition System (DIS) generates approximately 40,000 volts. Direct contact with DIS could result in personal injury.
NOTE: Ignition components may be damaged if test is performed with more than 1/4" clearance between wire and engine ground.
  1. This system has 3 independent coils. These coils must be tested separately. Remove spark plug wire from spark plug No. 2. Insert a clean, known-good spark plug into boot, and ground spark plug to engine. Crank engine, and watch for spark between electrodes of spark plug. Repeat this test for 5 remaining cylinders.
  2. If no spark is present on all cylinders, go to NO-START TEST. If one or more cylinders has weak or no spark, remove spark plug wires individually. Using an ohmmeter, measure resistance of each spark plug wire. Resistance should be 3000-12,000 ohms per foot (250-1000 ohms per inch). Replace spark plug wire(s) if resistance is not within specification. If resistance is as specified, go to IGNITION COIL RESISTANCE TEST.
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