Remote Canister Control Valve - Test Procedure

84buick08 Bulletin 84-6E-17A

Date June '84

Ref. No. 84-188-6E
SUBJECT: TESTING PROCEDURE FOR REMOTE CANISTER CONTROL VALVE (TYPE 1)

MODELS AFFECTED: ALL 1982-1984 3.0L (VIN CODE E) 3.8L (VIN CODE A) 4.1L (VIN CODE 4) 5.0L (VIN CODE Y) 3.8L TURBO (VIN CODE 3 AND 8) BUICK ENGINES

NOTE: THIS BULLETIN REPLACES 84-6E-17 WHICH SHOULD BE REMOVED.

Should a vehicle be received with comments of low fuel mileage, poor performance or a service engine soon light on with Code 45, the canister purge valve should be checked per the procedures provided in this bulletin.

When diagnosing a condition such as rough idle, rich acceleration, or lean idle duty cycles (high, dwell readings indicates an over rich condition), the following procedure should be followed for diagnosis of the canister control valve:

1. Apply a short length of 3/8" (9.5 mm) I.D. hose to the valve's carburetor bowl tube on the canister control valve and blow very lightly into it. Air should pass out through both the canister tube and purge valve tube. If it does not, replace the canister control valve.

2. Use a hand vacuum pump to apply vacuum (15" Hg or 51 kPa) to the manifold vacuum tube. The diaphragm should hold vacuum for at least 20 seconds. If it does not, replace the canister control valve.

3. With vacuum still applied to the manifold vacuum tube, again try blowing lightly through the hose into the carburetor bowl tube. No air should flow from the canister tube or purge vacuum tube. If air does pass through either tube, the valve assembly is not sealing properly, and the canister control valve must be replaced.