Roadmaster V8-350 5.7L VIN P MFI (1995)
Canister Purge Solenoid: Description and Operation
Canister Purge Solenoid
This system has a remote mounted canister purge control solenoid valve. The Powertrain Control Module (PCM) operates this solenoid valve to control
vacuum to the canister. Under cold engine or idle conditions, the solenoid valve is closed, which prevents vacuum from being applied to the canister.
The PCM activates (or opens) the solenoid valve and allows purge when:
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Engine is warm.
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After the engine has been running a specified period of time.
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Above a specified road speed.
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Above a specified throttle opening.
