Transmission Controlled Spark: Maintenance
Periodic maintenance of Transmission Controlled Spark components is not normally required, should a switch or valve fail to operate properly it should be replaced. However the following components do require maintenance or adjustment to keep exhaust emission system as a whole, working properly.
| Component | Service Interval (Miles) | |
|---|---|---|
| Oil Filler Cap | Clean Every 6, 000 | |
| Exhaust Heat Valve | Lubricate Every 6, 000 | |
| Drive Belts | Adjust Every 6, 000 | |
| Air Cleaner | Clean Every 6, 000 | |
| Replace Every 12, 000 | ||
| Distributor Cam Wick | Rotate Every 6, 000 | |
| Replace Every 12, 000 | ||
| Oil Filler Cap | Clean Every 6, 000 | |
| PCV Valve | Replace Every 12, 000 | |
| PCV Filter (6 Cyl.) | Clean Every 12, 000 | |
| Charcoal Canister Inlet Filter | ||
| (V8 Auto. Trans. Only) | Replace Every 12, 000 | |
| Carburetor | Adjust Every 12, 000 | |
| Spark Plugs | Clean Every 12, 000 | |
| Ignition Timing | Check Every 12, 000 | |
JEEP EMISSION CONTROLLED DISTRIBUTOR VACUUM APPLICATION
| MANUAL TRANSMISSION (GEAR) | AUTOMATIC TRANSMISSION (VEHICLE SPEED) | AMBIENT (AIR) TEMPERATURE | COOLANT TEMPERATURE | VACUUM APPLIED TO DISTRIBUTOR | |
|---|---|---|---|---|---|
| 3 SPEED | 4 SPEED | ||||
| 1-2 | 1-2-3 | Under 25 MPH | Below 63°F | Below 160°F | Manifold |
| 1-2 | 1-2-3 | Under 25 MPH | Below 63°F | Above 160°F | Ported |
| 1-2 | 1-2-3 | Under 25 MPH | Above 63°F | Above 160°F | None |
| 1-2 | 1-2-3 | Under 25 MPH | Above 63°F | Below 160°F | Manifold |
| 3 | 4 | 25-30 MPH | Below 63°F | Below 160°F | Manifold |
| 3 | 4 | 25-30 MPH | Below 63°F | Above 160°F | Ported |
| 3 | 4 | 25-30 MPH | Above 63°F | Above 160°F | Ported |
| 3 | 4 | 25-30 MPH | Above 63°F | Below 160°F | Manifold |
NOTE:
If equipped with thermal vacuum switch (TVS), intake manifold vacuum is applied to the distributor when engine coolant temperature reaches 225°F.