I guess a lot of people are having this issue.
back when I searched for it I couldn't find anything...
my car is not stock at all so dealer warranty was out of the question for me.
but for anyone that has this problem and is debating to DIY it.
I'd say go for it.
1. jack up the car, setup some towers.
2. remove rear wheels
3. remove 4 cradle bolts
4. remove rear brake calipers
5. remove 4 drive shaft bolts
6. remove 1 shock absorber bolt (bottom one) per side.
7. lower cradle assy out of the way.
8. remove EVAP canister assy. (2 10mm bolts and hoses)
9. replace valve ( one small bolt, plastic clip is a pain broke mine but it dont matter its part of the bad valve anyways)
10. re-assemble
total time 1.5h if you know the rear Camaro suspension.
for me it was easy, had previously done solid bushings and suspension components.
Hope this helps some one.
