Canister Purge Check (6 Cyl.)

Tee in vacuum gauge between canister and canister purge solenoid. Stop engine, then restart and raise RPM to initiate Self-Test. Observe vacuum gauge during initial pulses. If vacuum pulses 3 times between 0-1 in. Hg, go to Spark Retard Solenoid Check. If vacuum is always high or low, go to test 16, Canister Purge Solenoid test.