Altitude Compensator: Service and Repair

Fig. 98 Disconnecting vacuum hoses & VDV.:

Fig. 99 Installing VDV & EGR vacuum hoses.:

1. Remove air cleaner.
2. Remove blind caps attached to altitude compensation pipes of carburetor.
3. Install altitude compensator and connect vacuum hoses between carburetor and altitude compensator.
4. Install brackets for vacuum switch and vacuum reservoir tank, then insert switch and tank into brackets.
5. Attach vacuum switching valve with bracket to air cleaner support.
6. Disconnect vacuum hoses and VDV, Fig. 98, then install VDV and EGR vacuum hoses, Fig. 99.

Fig. 100 Connecting vacuum hoses & one-way valve.:

7. Disconnect vacuum hose between intake manifold and canister, then connect vacuum hoses and one-way valve, Fig. 100.
8. Connect vacuum hose between vacuum tank and vacuum switching valve, then remove tape which secures connectors for sub-harness.

Fig. 101 Connecting sub-harness, vacuum switching valve & vacuum switch.:

9. Connect sub-harness to engine harness, vacuum switching valve, and vacuum switch, Fig. 101, then secure vacuum hoses and harness with bands.
10. Install air cleaner and remove blind cap attached to air cleaner, then connect air hose between altitude compensator and air cleaner.
11. Start engine and check air and vacuum lines for leaks.
12. If there are no leaks, check new EGR system as follows:
a. Remove AB valve hose from air cleaner and shut off air passage between TVV and air cleaner by pinching off hose, then disconnect vacuum hose from vacuum switch.
b. Connect vacuum gauge to end of vacuum hose. If intake manifold vacuum is not present recheck air and vacuum lines.
13. Warm up engine until it reaches operating temperature and check idle speed, adjusting as necessary.