Ignition System
| Inspect the spark plugs for proper heat range and reach.
Refer to
Ignition System Specifications
.
• | Inspect for proper ignition voltage output using the following
steps: |
1. | Attach the J 26792
Spark Tester to engine ground. |
2. | Connect the spark plug end of the spark plug wire to the J 26792
. Connect the other end
of the spark plug wire to the coil being tested. |
3. | Connect the spark plug end of the companion spark plug wire to
ground. |
The companion spark plug wire is the wire attached to
the corresponding coil tower.
4. | Crank the engine while observing the J 26792
. A spark should be observed. |
5. | Repeat the above steps for each coil. |
• | If 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 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 3,000 ohms per foot (9,868 ohms per meter).
| Important: : Spraying the secondary ignition wires with a light mist of water may
help locate an intermittent problem. Ignition voltage arcs to ground when
a secondary component is faulty.
|
- | Defective ignition 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 |
- | 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. Refer to
Spark Plug Inspection
. |
|