Carbon Canister
- Start engine and run until it reaches normal operating temperature. Check canister for cracks, damage, leakage or saturation. If any of these conditions exist, replace canister.
- Remove canister from vehicle. Check function of No. 1 (uppermost) purge control valve. Attach vacuum pump with gauge to hose attached to No. 1 purge control valve nipple.
- Apply vacuum to No. 1 purge control valve. Blow into port on side of canister. See Fig 1
. Valve should be closed when vacuum is below 4.4 in. Hg and should open when vacuum is above 4.4 in. Hg.
Courtesy of FORD MOTOR CO.
- If purge control valve does not function, replace carbon canister/purge control valve assembly. Check function of No. 2 (on top of canister opposite No. 1 purge control valve) purge control valve. See Fig 1
.
- Attach hose to No. 2 purge control valve nipple. Alternately blow and suck on hose. Air should pass freely in both directions. If purge control valve does not function, replace carbon canister/purge control valve assembly.