To test the ignition system, perform the test procedures in a particular sequence. Start with the secondary spark test, commence to the coil test (located under the coil procedures later in this section) and, finally, perform the failure-to-start test. Performing the tests in this order will narrow down the ignition system problem in the easiest manner.
SECONDARY SPARK TEST
- Remove the cable from the No. 1 spark plug, then insert a clean spark plug into the spark plug boot.
Due to the high secondary voltage and risk of electrical shock, it is advisable to wrap a thick, dry cloth around the boot before grasping it.
- Ground the plug to the engine (touch the spark plug metal body to the engine block or other piece of metal on the car).
See Figure 1
- Crank the engine and look for a strong, blue spark across the electrodes of the spark plug.
- Repeat the test for the remaining cylinders. If there is no spark during all cylinder tests, refer to the failure-to-start test. If one or more tests indicate irregular, weak or no spark, refer to the coil test.