Spark Check

1998 Mazda Protege DX, AutomaticSECTION Spark Check
  1. Remove spark plug. Connect spark plug to high-tension lead and hold about 1/4" from ground. Crank engine and verify a strong Blue spark is discharged. If spark is present at all spark plugs, see CRANKSHAFT POSITION (CKP) SENSOR.
  2. If no spark is present at all plugs, see NO START (NO SPARK). If spark is not present at one plug, check spark plug wire resistance on suspect wire. Resistance should be less than 22,900 ohms per 3.28 feet. Replace spark plug wire and spark plug as necessary.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.