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Home >> Ford >> 1981 >> Cutaway 4.9L Eng VIN E >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> MCU Engine Control System >> Diagnosis & Testing >> Non-Code Tests >> Canister Purge Check
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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.