Ignition System
| Test for proper ignition voltage output using the following
steps:
- Clip the spark tester J 26792
to engine ground.
- Connect one end of a spark plug wire to the spark tester, and
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,
and connect the other end of the spark plug wire to ground.
- Crank the engine while you observe the spark test. You should
observe a crisp blue spark.
- Repeat the above steps for each coil.
- If no spark is present at the coils, check for the following conditions:
- | The coils--Inspect for cracks, for carbon tracking or arcing,
or for a secondary resistance value outside the specified range. |
Coil Resistance 5,000-8,000 ohms (5K-8K ohms) - | The 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.
|
- | The 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. |
- | The ignition system wiring--Inspect for 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 the spark plugs are gas or oil fouled, you must determine the cause
of the fouling before you replace the spark plugs.
|