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The most frequent issue with apurgevalve is when it remains open or partially open. Either issue may trigger the "Check Engine” or other error codes. A faulty purgevalve may preventthe vehicle from starting after refueling.A malfunctioning purge valve often emits unusually high exhaust which could make the vehicle fail emissions testing. When fumes build-up in the fuel lines it can cause the vehicle to backfire or stall.
Fault code or Check Engine light
A common sign of a faulty purge valve is a fault code or check engine light that displays in the instrument panel. To determine what is causing the fault code or warning light have the car placed on a diagnostic scanner.
A problem with the purge valve can cause a vacuum leak. When there is a vacuum leak, this can cause the vehicle to have problems starting. A vacuum leak will allow excess air into the motor, which disturbs the air-fuel ratio causing performance issues.
A faulty purged valve may cause the engine to idle roughly. If the purge valve sticks open, it affects the idle speed and performance quality. A vacuum leak can also stem from damaged or detached purge valve hoses.
A purge valve can cause the engine to misfire. If the purged valve does not open on time, it may cause excessive fuel emissions buildup in the charcoal canister. Over time, the emissions buildup can flood the engine cylinders, resulting in an irregular fuel mixture causing the engine to misfire or stall.
The testing procedure may be different depending on the make and model of the vehicle. Check the specific vehicle’s manual for instructions on how to check the purge valve. Without voltage, the purged valve should be closed and open when the voltage is applied. Some service manuals recommend applying a battery connection to the terminals of the purged valve and listen for an audible click. If the click is heard the purge valve is opening correctly.
Next, test the purge valve to see if it closes properly. Connect a vacuum pump to the purge valve. If the vacuum pressure drops, the valve is not closing properly and will need replaced. If the vacuum pressure remains steady, the purge valve is closing correctly. An emissions test is another way to check for a faulty purge valve. If unusually high exhaust levels are detected, replace the purge valve or its hoses.
Knowing how to troubleshoot a purged valve can help save time and money. If the vehicle displays any of the symptoms mentioned above, you may be able to fix it on your own with a little effort.
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