Ignition System
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• | Test for proper ignition voltage output using the following steps: |
- | Clip the J 26792
Spark Tester to engine ground. |
- | Connect one end of a spark plug wire to the spark tester. Leave the other end of the spark plug wire connected to the coil being tested. |
- | Connect another spark plug wire between the remaining tower of the coil being tested and ground. |
- | Crank the engine while observing the spark tester, a spark should be observed. |
- | Repeat the above steps for each coil. |
• | If spark is not present at the coils, inspect for the following conditions: |
| Important: If carbon tracking is detected on a component, replace that component and the mate.
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- | Coils--Cracks, carbon tracking/arcing, or a secondary resistance value outside the specified range. |
Coil Resistance 5,000-8,000 ohms - | Spark plug wires--Signs of arcing/cross firing, cracks, carbon tracking, plug boot damage, pinched, improper routing, or a resistance value outside the specified range. |
Spark Plug Wire Resistance-Regular 9,840 ohms per meter (3,000 ohms per foot)
Spark Plug Wire Resistance-Police 1,968 ohms per meter (600 ohms per foot)
| Important: Spraying the secondary ignition wires with a light mist of water may help locate an intermittent condition. Ignition components will arc to ground when a secondary component is faulty.
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- | Ignition system wiring--Loose ignition module feed or ground connection, or damaged system wiring. |
• | Remove the spark plugs. Inspect for the following: |
- | Inspect the spark plugs for carbon tracking on the porcelain and pitting on the plug wire contact. |
- | Burned or damaged electrodes |
- | Improper heat range or reach |
• | If the spark plugs are gas or oil fouled, the cause of the fouling must be determined before replacing the spark plugs. Refer to
Spark Plug Inspection
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