![]() If you see a discrepancy in the Vacuum Gauge you found the leak. Start with the Vacuum Advance and adjust Carb accordingly for Idle followed by other Vacuum Dependant Devices, noting Vacuum Readings. Once you have the engine Starting and Idling nicely begin connecting the Vacuum Items. Ensure Carb is Set up with Primary Throttle Plates in the Idle Circuit and Secondaries Set Per Mfgr's Specs - Turn Air Screws approx 1 1/8 off Seat and Start the engine with No Vacuum Advance by turning the Dizzy to establish Initial Timing. It should be Stable if not, you have Leaks in the Intake or a cam going south. 4 Degrees isn't much you should be around 10 Degrees BTDC with a RV Cam.ĭisconect and plug all Vacuum Sources Tranny Mod, PB, PCV, Vacuum Advance. Sounds like you have a severe Vacuum Leak or Valve train problem.
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