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Ignition Coil Resistance Test

  1. Remove ignition cables, and measure their resistance (3000-12,000 ohms per foot). Replace cable(s) if necessary. Disconnect ignition coil harness connector. Measure primary coil resistance between B+ (battery) terminal and pin corresponding to cylinder(s) in question. See Figure .
  2. Measure secondary coil resistance between coil towers of grouped cylinders. See CYLINDER GROUP IDENTIFICATION table. Replace ignition coil if primary/secondary coil resistance is not as specified. See IGNITION COIL RESISTANCE table under IGNITION COIL.
CYLINDER GROUP IDENTIFICATION

Application Grouped Cylinders
3.3L & 3.5L 1 & 4; 2 & 5; 3 & 6
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