Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Evaporation System: Operation: Notes
The first stage of purge operation occurs when throttle plates are open and a ported vacuum signal is sent to Vacuum Control Valve (VCV). If engine coolant temperature is above 129° F (53° C), ported vacuum signal is sent to No. 1 Purge Control Valve. Manifold vacuum on No. 1 Purge Control Valve draws fuel vapors through an orifice and delivers the vapors to intake manifold.
The second stage of purge operation occurs when engine speed is above 1500 RPM and engine coolant temperature is above 140° F (60° C). The ECA turns on the Canister Purge Control Solenoid and allows vacuum to enter canister purge valve. Manifold vacuum then draws fuel vapors though an additional larger orifice increasing total amount of purge flow.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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