![]() It works in conjunction with the charcoal canister to capture and redirect excess fuel vapors so the engine can burn them again. The entire system that it’s a part of is your vehicle’s EVAP (Evaporative Emission) system. To begin with, it’s an emissions component that redirects excess fuel vapors back into the engine. Unless you’re a mechanic or an engineer, you’ve probably never heard of a canister purge valve before. Related: Rough Idle Causes & How to Fix it Vapor Canister Purge Valve Function The size of the leak would affect how significant of an issue this is. The result of a vacuum leak on a canister purge valve would be a rougher than usual idle. Vapor canister purge valves run off of vacuum, and if you have a vacuum leak, it can affect engine performance, especially at lower engine speeds. It is pretty rare that it will not start at all because of this valve, though. While your vehicle should still start, you’re going to notice that it takes a bit more work to get there. If the purge valve is stuck open, you’re going to have an excess amount of air when you go to start the engine, and since your vehicle isn’t accounting for this, it’s going to throw off the fuel to air ratio. The vapor canister purge valve does a lot of its work when you’re starting up your vehicle to empty the fuel tank of gases, so it makes sense that this would be when you notice most of the symptoms. Related: 8 Causes Why Your Car Won’t Accelerate 4. While these effects will be more noticeable at lower RPMs, they can affect performance across all engine speeds it just isn’t as noticeable. That means every time you hit the throttle your vehicle isn’t dropping enough fuel in the engine for the amount of fuel there. When the vapor canister purge valve is stuck open, you’re getting more air in the system than your vehicle expects. Of course, you probably won’t notice this unless you take your vehicle in for an emission test. Instead, they’ll run straight out of the exhaust, which will cause much higher emission levels. If the vapor canister purge valve is stuck closed instead of open, the valve won’t push any fuel vapors back into the engine. While the symptoms can change depending on whether or not the valve is stuck open or closed, one thing that shouldn’t change is that you should get a check engine light. The most common thing you’ll notice from a bad vapor canister purge valve is that you’ll get a check engine light that you weren’t expecting.
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