Emission Control Systems: Service and Repair

Fig. 39 Installing altitude switch.:

Fig. 40 Identifying altitude solenoid valve connector.:

Fig. 41 Installing altitude relay.:

Fig. 42 Removing rubber caps from carburetor altitude compensation lines:

1985-86 PICKUP w/CARBURETED ENGINE

1. Install altitude switch on righthand side of dash, Fig. 39, and connect electrical connector.
2. Identify altitude solenoid valve electrical connector, Fig. 40, then install altitude solenoid valve and secure connector. Use sub-harness on type B connector only.
3. Install altitude relay, Fig. 41.
4. Remove rubber caps from altitude compensation lines on carburetor, Fig. 42, and connect lines to altitude solenoid.
5. Start engine and check air and vacuum lines for leaks.
6. If there are no leaks, start engine and run until normal operating temperature is reached, then check idle speed and adjust as necessary.