N1 - Vacuum Check

- Disconnect vacuum booster hose from booster.

- Connect Rotunda Vacuum/Pressure Tester 059-00008 or equivalent to the vacuum hose with a T-fitting.

- Key ON, Engine Running. Allow engine to reach normal operating temperature.

- Record the vacuum pressure.

- Is the vacuum reading 457-533 mm Hg (17-21 in Hg)?

YES -- Go to N2.

NO -- Tune-up or repair engine as required.