Mixture Control System
1977-821. Check hoses for cracks, leaks, or damage and repair or replace as necessary.
2. Disconnect vacuum hose from mixture control valve, place hand over air inlet of valve, and check that vacuum is not felt.
3. Check that vacuum is momentarily felt when hose is reconnected.
Speed Sensor, Testing
NOTE: The speedometer sensor is an integral part of the speedometer assembly. Therefore, if the speed sensor is found to be defective, the entire speedometer assembly must be replaced.
1. Disconnect speedometer cable from transmission.
Fig.96 - Testing Speed Sensor:
2. Disconnect computer connector and connect circuit tester to wiring side socket as shown in Fig. 96.
3. Rotate speedometer cable and record number of cycles indicated on the circuit tester for one complete revolution of the speedometer cable.
4. If indicated number of cycles is not as specified on the chart in the figure, replace the speedometer assembly.