Question

2004 Chevrolet Malibu 2.2L with engine code P0496. How can I find the high purge flow myself without an automotive mechanic?

Answer 1

P0496 Vacuum detected when a purge is not commanded

This code condition is for the purge valve, where vacuum is  detected when the purge valve is commanded close. it possible that a slightly open purge can cause this condition.

 Here is a purge valve sample alot of purge valve have been replaced, when the problem was not with the purge valve at all, What happend was the FTP (fuel tank pressure ) reported incorrrect fuel tank pressure.

 

Answer 2

The P0496 code indicates a problem with the Evaporative Emission (EVAP) System. The EVAP system is designed to prevent fuel vapors in the gas tank from escaping into the atmosphere by channeling them to the engine for combustion. This code suggests that there is still a flow of emission gases even when the system is supposed to be sealed. The most likely causes for this code include:

• Faulty EVAP Canister Vent Valve
• Faulty EVAP Canister Purge Valve
• Clogged EVAP Canister
• Faulty EVAP Pressure Sensor

For more information about the code, visit the following link:

P0496 Chevrolet Code - Evaporative Emission System Flow During Non-Purge
Read more: https://www.autocodes.com/p0496_chevrolet.html