Having problems with your 1999 Chevrolet Silverado 1500 ?
Engine light comes oncodepo496 - 1999 Chevrolet Silverado 1500
Code P0496 is defined as "Evaporative Emission (EVAP) System Flow During Non-Purge"
If the Evap purge valve does not seal properly, fuel vapors could enter the engine at an undesired timing causing drivability concerns. The control module tests for this by commanding the EVAP purge valve OFF closed and vent valve ON closed, sealing the system, and monitoring the FTP for an increase in vacuum. If the control module detects that Evap system vacuum increases above a calibrated value, DTC P0496 will be set.
This could be a sign that your purge valve is intermittently failing so you might want to get it checked out before it turns into a bigger problem that affects the drivability of your truck.
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