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 spark should
be observed. |
- | Repeat the above steps for each coil. |
• | If adequate spark is not present at the coils, inspect for the
following conditions: |
- | Coils - Cracks, carbon tracking/arcing, or a resistance value
outside the specified range. |
Coil Secondary Resistance 5000 - 8000 ohms (5K - 8K ohms) - | Spark Plug wires - Signs of arcing/cross firing, cracks, carbon
tracking, plug boot damage, pinched, incorrect routing, or a resistance value
more than the specified value. |
Spark Plug Wire Resistance 3280-4921 ohms/meter(1000-1500 ohms/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 malfunctioning.
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- | Malfunctioning ignition control module. |
- | Ignition System Wiring - Loose ignition module feed or ground
connection, or damaged system wiring. |
• | Remove spark plugs and inspect for the following conditions: |
- | Burned or damaged electrodes |
• | 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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