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Home >> Jaguar >> 1985 >> XJ-S >> Repair and Diagnosis (Single Page) >> Engine Performance >> Tune-Up >> Ignition System - LUCAS Electronic >> Testing >> System Spark Check
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

System Spark Check

  1. Disconnect high tension wire from center of distributor cap. Hold wire about 1/4" from good engine ground.
  2. Crank engine. If a good spark is obtained, check spark plug wires, spark plugs, distributor cap and rotor. If no spark or poor spark is obtained, perform component checks.