Diplomat L6-225 3.7L VIN E 1-bbl (1982)
Cruise Control Vacuum Reservoir: Testing and Inspection
1. Disconnect vacuum hose at servo and install suitable vacuum gauge in hose.
2. Start engine and run at idle. Vacuum gauge should read 10 inches Hg.
3. If vacuum is below 10 inches Hg, check for vacuum leaks or poor engine performance.
