Excellent writeup!
Thanks for the help, I just took my Evap system apart. The lines were filled with charcoal. (Driven many miles with the check Evap warning)
The local Mech replaced the Evap canister and the vent valve and the purge valve up front without clearing the lines.
I checked the lines and a ton of charcoal came out. I shook out the front purge valve and the volume control valve and the hoses. I must have collected 1/4 cup of charcoal.
I disassembled the volume control valve, blew it clean and wiped it out with a paper towel soaked in WD40.
Then I disconnected the evap lines at the canister end and blew the lines out from both ends of the car using a compressor.
Not sure if I got it totally clear. Even after repeated high pressure attempts from both ends, there seems to be a fair bit of backpressure when stuffing the nozzle into the line. But my helper (okay my 13y/o kid) said airflow could be felt out of the line up front when I had the compressor nozzle blasting from the back end.
All cleaned and reassembled, reset the OBD-II at Autozone. Fingers crossed...I need to get this badboy inspected!
