Why is my Suzuki Swift idling rough o r stalling — could the purge control valve be stuck open?

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Why is my Suzuki Swift idling rough o r stalling — could the purge control valve be stuck open?

My 2014 Swift has started idling roughly and sometimes stalls when stopped at signals. A mechanic suggested the purge valve might be stuck open. How does this affect engine performance, and is it a common problem?

Gari Specialist asked on 03 May 2025 15:37:15 pm

1 Answer

19 views |

Gari Master - on 03 May 2025 15:40:35 pm

Yes, a stuck-open purge control valve is a common cause of rough idling and engine stalling, especially during warm starts o r at idle. The purge valve is part of the EVAP Evaporative Emission Control system, which controls fuel vapor flow from the charcoal canister to the engine.

When stuck open:

It sends excess fuel vapors into the engine intake.

This leads to a rich air-fuel mixture, causing unstable idle and occasional stalling.

This is a common issue in Pakistan due to dusty conditions, poor maintenance, o r unfiltered fuel vapors clogging the valve. If cleaning doesn’t help, replacement is usually necessary.