Testing for Spark at Coil

Fig 17 Testing For Spark:

WARNING: The direct ignition systems generates approximately 40,000 volts. Personal injury could result from contact with this system.

NOTE: The coil pack contains independent coils. Each coil must be checked individually

CAUTION: Spark plug wire damage may occur if the spark plug is moved more than 1/4 inch away from the engine ground.

CAUTION: Do not leave any one spark plug cable disconnected any longer than 30 seconds or possible heat damage to catalytic converter will occur.

CAUTION: Test must be performed in park only with the parking brake on.

NOTE: New isolated engine valve cover may not provide adequate ground. Use engine block as engine ground.

Use a new spark plug and spark plug cable for the following test:
1. Insert a new spark plug into the new spark plug boot. Ground the plug to the engine (Fig. 17) Do not hold with your hand.
2. Starting with coil insulator #1, remove it from the DIS coil.
3. Plug the test spark plug cable onto #1 coil tower. Make sure a good connection is made; there should be a click sound.
4. Crank the engine and look for spark across the electrodes of the spark plug.

CAUTION: Always install the cable back on the coil tower after testing to avoid damage to the coil and catalytic converter.

5. Repeat the above test for the remaining coils. If there is no spark during all cylinder tests, proceed to the Failure To Start Test.
6. If one or more tests indicate irregular, weak, or no spark, proceed to Check Coil Test.