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2003 Chevrolet Silverado 1500, Vacuum/Pressure/Flow Scandata
Posted to the Waveform Library on 6/18/2007

with the Vent valve port capped , the system decided to open the purge valve at exactly the correct time and i captured this , the fix was a Evap Vent Valve

DTC P0455 Evaporative Emission Control System Pressure Sensor Leak Detected (Gross Leak)

Freeze Fra...

 

car Vehicle Data

2003 Chevrolet Silverado 1500 5.3L

Engine5.3 L / 8 cyl / GAS
Trans4-speed AutomaticTransmission (Electronic)
DeliveryFuel Injection
SubsystemECM/Inputs/Outputs
Component
ConditionKnown Bad

car Vehicle Data

2003 Chevrolet Silverado 1500 5.3L

Engine5.3 L / 8 cyl / GAS
Trans4-speed AutomaticTransmission (Electronic)
DeliveryFuel Injection
SubsystemECM/Inputs/Outputs
Component
ConditionKnown Bad