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The wifes 2011 Enclave just developed a popping noise in the intake tract on cold starts. It only happens when dead cold and only lasts for 5-10 seconds. It sounds almost like it is backfiring into the intake. The engine RPM varies slightly and you can feel a slight vibration when it does it. The vehicle has 175K on it. The only code that shows up is a P0496 for Evap High Purge Flow. I did replace the Evap Solenoid a year ago as it would be hard to start after filling up the tank. I did some quick datalogging and I can't see any issues with the items I logged (Ambient Air, Baro, Short Term Fuel Trims, Fuel Rail Pressure, Mass Air Flow, IAT and Coolant Temp. Has anyone experienced this with their 3.6L before by chance?
Thanks
Thanks