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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - System/Component Tests) >> Emission Systems & Sub-Systems (Gasoline) >> Fuel Evaporation Control (C-3) >> Vapor Canister Purge Valve ("P" Series & 4.3L CPI)

Vapor Canister Purge Valve ("P" Series & 4.3L CPI)

WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1992 Pontiac Trans Sport, 1992 Oldsmobile Silhouette, 1992 Oldsmobile Bravada, 1992 GMC Yukon, and 1992 GMC Vandura Special. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install a short length of hose to lower port of purge valve. Blow into hose. Little or no air should pass into canister (a small amount of air will pass if the canister has a constant purge hole).
  2. Using a hand-held vacuum pump, apply 15 in. Hg to vacuum control (upper) port. If vacuum does not hold for 20 seconds, replace canister.
  3. With vacuum still applied, again try to blow through hose connected to lower port. An increased flow of air should be observed. If airflow does not increase, replace canister.
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