October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Vacuum Advance Test

Connect timing light to engine. Start and run engine at idle. Verify idle speed and base timing are set to specification. Disconnect and plug vacuum hoses at distributor advance and retard diaphragms (if equipped). Increase engine speed to 2500 RPM. Check ignition timing. Connect vacuum hose and verify that ignition timing advances.