My 2006 LT 2.4L cel is on. Evap related so I bring it to Chevy. 1st it was the throttle position sensor &600 part I got used $25 ,,paid 2 hour diag, R&R'd myself and then they programed, cel still on. They do wiring repair at harness w/o auth $600 . Cel off until I hit the street. They do smog test (@ no charge). Vacuum hose leak in the line that goes into the fuel tank for back pressure (gas cap) & they want a $1000 for R&R (GO F**K YOURSELF). Man did they see me coming. And after paying $850 in all just to be told another grand, on top of that, they won't show me where the leak is coming from so I can throw some tape on it.
My question is; Is there a common wear spot I should be looking at/for?
James

 

The vapor return line, probably rusted out. Fairly common in areas where the roads are salted.

 

We might be able to explain things if you were to tell us what "evap related" means. All evap related problems have a code most start with a P.
Instead of getting all wound up complaining about GM ask yourself why you went to them for a car that has not been made for 10 years. They don't know anything more about it than t6he guy down the street, sometimes less and charge more.

If you paid for a diagnostic why was the repair not guaranteed?

For the vapor leak look under the car just in front of the driver side rear wheel . There are 2 metal pipes held by a plastic bracket. Under the bracket is the usual spot. You can get new fuel and vapor lines for less than $200 and do it yourself or use a couple of hose clamps and a bit of fuel injection hose.

 

Have a look in this thread

https://www.chevyhhr.net/forums/www....ad.php?t=62310