Spark Plug Spark Test
SPARK PLUG SPARK TEST1. Disconnect the high-tension lead from the spark plug.
2. Connect a new spark plug to the high-tension lead.
3. Hold the high-tension lead with insulated pliers approx. 5-10 mm (0.20-0.39 in.) from a ground.
4. Crank the engine and verify that a strong blue spark is visible. If not, replace the spark plug or high-tension lead as necessary.
NOTE: If a timing light is used to check for spark, some lights will not illuminate at No.2 and No.4 cylinders even if the ignition system is normal.