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1.13.4 Purge Valve Field Service Example
Field example of Purge valve malfunction : Purge valve opened stuck
Coupe vehicle : Engine is hard to start when hot summer season.
And fuel control is so rich with engine vibration after start.
Cause of
Purge valve is stuck at closed position with hot condition. At this time, over fuel gas is
supplied into engine when vehicle start and it lead to make hard vehicle start.Engine
vibration is still remained until fuel gas is completely exhausted.
Signal view
This is frequently taken place with Siemens purge valve equipped vehicle. With BOSCH
valve, it is sometimes occurred.
O2 sensor signal with problem occurrence
Purge valve stuck is not checked with signal,indirectly it can be
checked with O2 sensor signal when fuel control is too rich.