Federal Vehicles
PROCEDURENOTE: Cold and Hot in the following sentences express the temperature of the coils themselves.
Cold is from -10°C (14°F) to 50°C (122°F).
Hot is from 50°C (122°F) to 100°C (212°F).
1. DISCONNECT DISTRIBUTOR CONNECTORS.
2. REMOVE DISTRIBUTOR CAP.
3. REMOVE ROTOR.
4. REMOVE IGNITION COIL DUST COVER.
5. INSPECT IGNITION COIL PRIMARY COIL RESISTANCE.
- Using an ohmmeter measure the resistance between the positive (+) and negative (-) terminals.
Primary Coil resistance
- Cold: 0.36 - 0.55 Ohms
- Hot: 0.45 - 0.65 Ohms
- If the resistance is not as specified, replace the Ignition Coil.
6. INSPECT IGNITION COIL SECONDARY COIL RESISTANCE.
- Using an ohmmeter measure the resistance between positive (+) and high-tension terminals.
Secondary Coil resistance
- Cold: 9.0 - 15.4 k ohms
- Hot: 11.4 - 18.1 k ohms
- If the resistance is not as specified, replace the Ignition Coil.
7. INSPECT AIR GAP.
- Using a thickness gauge, measure the air gap between the signal rotor and pickup coil projection.
Air gap: 0.2 - 0.4 mm (0.008 - 0.016 in)
- If the air gap is not as specified, replace the Distributor Housing assembly.
8. INSPECT RESISTANCE OF THE SENSORS (SIGNAL GENERATORS).
- Using an ohmmeter, measure the resistance between the terminals G(+) and G(-) (camshaft position sensor); NE(+) and NE(-) (engine rpm sensor).
Resistance (Cold):
- G (+) and G (-): 185 - 275 Ohms
- NE (+) and NE (-): 370 - 550 Ohms
Resistance (Hot):
- G (+) and G (-): 240 - 325 Ohms
- NE (+) and NE (-): 475 - 650 Ohms
- If the resistance is not as specified, replace the distributor housing assembly.
9. REINSTALL IGNITION COIL DUST COVER.
10. REINSTALL ROTOR.
11. REINSTALL DISTRIBUTOR CAP.
12. RECONNECT DISTRIBUTOR CONNECTORS.