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 to the coil being tested. |
- | Connect one end of another spark plug wire to the other coil tower.
Connect the other end of the spark plug wire to ground. |
- | Crank the engine while observing the spark tester. A crisp blue
spark should be observed. |
- | Repeat the above steps for each coil. |
• | If spark is not present at the coils, test for the following conditions: |
- | Coils -- Cracks, carbon tracking/arcing, or a secondary resistance
value outside the specified range. |
Coil Resistance 5,000-8,000 ohms (5K-8K 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 600 ohms per ft
| Important: Spraying the secondary ignition wires with a light mist of water may
help locate an intermittent problem. 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 spark plugs and inspect for the following: |
- | Burned or damaged electrodes |
- | Improper heat range or reach |
• | If spark plugs are gas or oil fouled, the cause of the fouling
must be determined before replacing the spark plugs. |
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