REMOVAL & INSTALLATION
Spark Control Computer (SCC)
See Figures 1, 2, 3, 4, 5, 6, 7 and 8
- Disconnect the negative battery cable.
- unplug the 10-way, 14-way connectors and outside air duct from SCC. Remove vacuum line from transducer.
- Remove the 4 mounting screws that hold the computer in place.
- Install a new computer and secure the mounting screws.
- Reconnect the vacuum line to the transducer, making sure the vacuum line is not pinched. Engage the dual connectors and outside air duct to SCC unit.
Do not remove the grease from 10-way or 14-way dual connector or connector cavities in spark control computer. The grease is used to prevent moisture from corroding terminals. If there isn't at least1/8in. grease on bottom of computer connector cavities, apply multi-purpose grease over entire end of connector plug before reinstalling.Vacuum Transducer
If vacuum transducer fails, the complete computer unit (SCC) must be replaced.Coolant Temperature Sensor
- Unfasten the electrical connector from the sensor.
- Remove the sensor from the engine. Some coolant may be lost from the system.
- Install the new sensor and tighten to 20 ft lbs. (27 Nm).
- Attach the electrical connector to the new sensor.
- Replace any lost coolant.
See Figures 9, 10, 11, 12, 13 and 14
- Remove splash shield from distributor and remove distributor cap.
- Pull straight up on rotor and remove it from shaft.
- Remove Hall Effect pick-up assembly.
- Install a new pick-up assembly onto distributor.
Hall Effect assembly wiring leads may be damaged if not properly reinstalled.
- Install the distributor rotor.
- Install the distributor cap and splash shield.
See Figures 15, 16, 17, 18, 19, 20 and 21
- Disconnect the negative battery cable.
- Disconnect the distributor pickup lead wires and vacuum hose(s), if equipped. Remove the splash shield, if equipped.
- Unfasten the distributor cap retaining clips or screws and lift off the distributor cap with all ignition wires still connected. Remove the coil wire if necessary.
- Matchmark the rotor to the distributor housing and the housing to the engine block.
Do not crank the engine during this procedure. If the engine is cranked, the matchmark must be disregarded.
- Remove the hold-down bolt and clamp.
- Remove the distributor from the engine.
- Remove and discard the O-ring.
- Install a new distributor housing O-ring.
- Install the distributor in the engine so the rotor is lined up with the matchmark on the housing. Make sure the distributor is fully seated and that the distributor shaft is fully engaged.
- If the engine has been cranked, position the engine so that the No. 1 piston is at TDC of the compression stroke and the mark on the vibration damper is lined up with 0 on the timing indicator. Then install the distributor so the rotor is aligned with the position of the No. 1 ignition wire on the distributor cap.
There are distributor cap runners inside the cap on 3.0L engines. Make sure the rotor is pointing to where the No. 1 runner originates inside the cap and not where the No. 1 ignition wire plugs into the cap.
- Install the hold-down clamp and snug the hold-down bolt. Connect the vacuum hose(s), if equipped.
- Connect the distributor pickup lead wires. Install the splash shield, if equipped.
- Install the distributor cap and snap the retaining clips into place or tighten the screws.
- Connect the negative battery cable.
- Adjust the ignition timing and tighten the hold-down bolt.
See Figure 22
The ignition coil is designed to operate without an external ignition resistor. Inspect coil for external leaks and arcing. Test the primary and secondary circuit resistances, replacing any coil that does not meet the manufacturers specifications.
Every time an ignition coil is replaced because of a burned tower or carbon tracking, always replace the coil secondary wire.Distributor Cap and Rotor
See Figure 23
The distributor cap and rotor must be inspected for flash over, cracking, burning and/or worn terminals. Check the carbon button in cap for cracking. Light scale may be removed with a sharp knife. Heavy deposits on the cap terminal or the rotor, require replacement of the component.