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Will the Canister Purge Valve Still Make a Clicking Sound When It's Broken?

1 Answers

McAngela

07/29/25 3:56pm

The canister purge valve typically produces a clicking sound during normal operation. However, if the valve is faulty, it may stop making this sound. Common symptoms of a malfunctioning canister purge valve include: the component remaining permanently open or closed due to a sealing failure. In such cases, since the electrical components are still functional, the valve may continue to produce the clicking sound. However, if the electrical components fail—such as due to grounding issues in the power supply, problems with the engine control unit, or damage to the valve's electrical parts—the canister purge valve will cease to function and, consequently, will no longer produce any sound. Here’s how to test the canister purge valve: 1. Warm up the car engine to normal operating temperature and let it idle. 2. Disconnect the vacuum hose from the vapor canister and check for vacuum suction. If there is no vacuum suction, the canister purge valve should be closed while the engine is idling. If vacuum suction is present, the valve should be open. 3. Press the accelerator pedal to raise the engine speed to around 2,000 rpm. Check the vacuum hose for suction. If suction is present, the system is functioning correctly. If there is no suction, use a multimeter set to the 20V range to test for voltage at the valve. If the voltage reading is normal, the valve is faulty. If the voltage is abnormal, there may be an issue with the wiring.

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