Canister Purge Check

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  12, Canister Purge Solenoid test.