![]() ![]() The fault code that is produced can be misleading in some cases. Generally, the check engine light will illuminate when the EVAP vent valve goes bad. What happens when the EVAP solenoid goes bad? The purge valve is generally in the engine bay and sometimes on or near the engine intake manifold. When the engine computer commands the purge valve open, it allows the engine vacuum to suck fuel vapors into the engine to be used. When it is "off", it is in the closed position. It can be opened up in percentages from 0% to 100%. The purge valve is a "duty-cycled" circuit. In most cases, it is located near the charcoal canister and may be underneath the vehicle. It allows air into the EVAP system when the engine computer commands it open. When it is "off,” it is in the open position. The vent valve is generally an "on/off" circuit. No, the EVAP vent valve and the purge valve are not the same. Is a vent valve the same as a purge valve? In most cases, it takes less than an hour to replace the EVAP vent valve. ![]() Labor fees from an auto repair shop are usually hourly. Labor fees from an auto repair shop can add to your overall cost. How much does it cost to replace an EVAP vent valve?Ĭosts can vary from $50 to $250 depending on your specific vehicle. The car's computer (engine control module) uses the purge valve to allow engine intake vacuum to suck fuel vapors, that are stored in the charcoal canister, into the engine to be used in combustion. The EVAP system works with many components including the purge valve solenoid, charcoal canister, fuel tank, and gas cap. The basic idea of the EVAP system is to control gas vapors from escaping the vehicle and causing air pollution and damage to the environment. While we are at it, we will have a basic look at the evaporative emissions system and at a common fault code that the EVAP vent valve can produce on modern vehicles. In this article, we will look at the EVAP vent valve (also known as the canister vent valve), and how a proper diagnosis can get the check engine light off of your instrument cluster. If your check engine light is on, in most cases, it is an immediate failed emissions test.īut what if all you need is an EVAP vent valve? ![]()
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