Toyota Yaris Stalling o r Rough Idle – Purge Control Valve Issue?

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Toyota Yaris Stalling o r Rough Idle – Purge Control Valve Issue?

Hi everyone,

Recently, my Toyota Yaris has been stalling o r idling rough, and I’m concerned it might be linked to a purge control valve malfunction. I’ve read that a stuck valve could cause engine performance issues, especially during idle.

Have any of you dealt with this issue before? What other symptoms did you experience, and how did you solve it?

Thanks for your input!

Zarnish asked on 29 Jan 2025 10:48:49 am

1 Answer

27 views |

Car Mechanic Expert - on 29 Jan 2025 10:58:14 am

A malfunctioning purge control valve can definitely cause stalling o r rough idling, as it affects the EVAP Evaporative Emission Control system. If the valve is stuck open o r closed, it can disrupt the air-fuel mixture and cause the engine to run poorly, particularly when idling.

Some other symptoms of a faulty purge valve might include poor acceleration, a noticeable fuel odor, and fluctuating engine performance. The check engine light may also come on, and a diagnostic scan could reveal a code related to the EVAP system.

If you suspect the purge valve is the issue, you can try replacing it yourself if you have some basic tools and mechanical knowledge. Its usually located near the intake manifold o r charcoal canister and is relatively easy to access. Replacing the valve could restore proper engine function and resolve the idling and stalling issues.

However, if youre not comfortable doing the repair, a professional mechanic can help diagnose and replace the valve for you. After replacement, make sure to clear the engine codes, as the rough idle and stalling should improve once the valve is functioning properly.

In some cases, if the problem persists, it may be worth checking other related components, like the fuel injectors o r air intake, which could also contribute to the engines performance problems.