What Causes the Idle Noise That Disappears When Accelerating?

1 Answers
ReeseMarie
07/25/25 5:35am
The reason for idle noise that disappears when accelerating is a faulty carbon canister purge solenoid valve, and replacement is recommended. Function of the Carbon Canister Purge Solenoid Valve: The carbon canister purge solenoid valve serves to reduce air pollution caused by fuel vapor emissions while simultaneously improving fuel efficiency. When the engine is turned off, the vehicle's activated carbon canister begins absorbing fuel vapors evaporating from the fuel tank, securely trapping them within the micropores of the activated charcoal to prevent vapor release into the atmosphere. Hazards of Engine Idling: During engine idling, the lower temperature and pressure inside the combustion cylinders prolong fuel ignition preparation time. Coupled with reduced cylinder sealing performance, this condition easily produces knocking sounds and shortens the engine's service life.
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