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Email: [email protected]. In most cars, the canister purge valve stays closed when no electricity is applied. In this condition, the purge valve traps vapors inside the charcoal canister, released previously by the fuel in the tank. When voltage is applied to the solenoid, it opens up and the purge valve releases the trapped vapors into the engine. The PCM will only allow the vapors to be released when the car is driving at a constant speed, favorably while driving on higher gears.
Releasing the vapors when the car is driving at low speed or under load could modify the air-fuel ratio to an extent where the engine might encounter misfires. A purge valve stuck open or obstructed could cause the vapors to be released or not released at an incorrect time, which could lead to an improper air-fuel ration and cause the check engine light to come up.
A properly-functioning purge valve should also be able to seal correctly and not release any vapor in the environment when closed and let vapor flow freely when opened. Usually, you can find this part inside the engine bay, near the fuel-delivery system. Most purge valves look the same: a small black plastic box with two or three small rubber hoses on either side and an electrical connector on the top. Remove the electrical connector that provides electricity to the solenoid and remove the vapor lines.
Next, remove the whole component. Most purge valves are held in place with one bolt or slid on a rubber bushing. If your purge valve has more than two pins inside the connector, check the purge valve electrical diagram to find out which pins control the solenoid.
You should hear an audible click every time you apply voltage to the system. If not, the solenoid might not work. To verify the proper sealing of the purge valve, use a vacuum pump to create a vacuum inside the canister purge valve and check the gauge for at least 5 minutes.
When this happens, the best bet is to replace it right away. The next thing to do is then to test the control circuit. The easiest and first thing to test is the positive side. Once your car starts, the canister purge valve fuse supplies power to the control side of the solenoid.
Click on it and activate it. Autoblog is partnering with YourMechanic to bring many of the repair and maintenance services you need right to you. Get service at your home or office 7 days a week with fair and transparent pricing.
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Rough idle One of the first symptoms that a faulty canister purge valve may produce is a rough idle. Difficulty starting Another symptom commonly associated with a bad canister purge solenoid is difficult starting.
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