2008 GMC Acadia Q&A
2008 GMC Acadia Question: Where is the evac purge valve located on my 2008 GMC acadia.
my suggestion is to stop guessing and have a shop pin point it for you. evap codes are tough to track down and need special equipment to determine the failure. Roy - mastertech6371
Agree with Roy.Evaporative Emission system problems are difficult for anyone to diagnose/test and repair themselves at home. Some evaporative diagnosis requires a scan tool to bi-directionally control solenoids to seal off and open and test for leaks. Another useful tool is a machine that generates an inert gas/smoke that when the system is sealed off, if there are any leaks the smoke "show up" where they are. Also some faults can be intermittent and when the codes are erased the self test procedures your computer uses to test the system can take a week or two to self complete as a certain specific drive procedure has to be performed. - patrick mannion