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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