Well on Tuesday 2/16/2016, I went to start my vehicle to go home from work. The rain has stopped from what began as snow a day earlier. The "Service Engine Soon", light came on. It still on. Its a 2003 Chevy Blazer 4x4 with 118889 miles on it. Yesterday, went to Autozone for a code. Got the P0442 code, twice. They suggested replacing EVAP Canister purge solenoid valve. I checked what I could and didn't find any holes. Checking gas cap seal and That looked good. Any suggestion? I had my brake line to back brakes replaced last summer and saw a line going to canister rusting too, but left it go.

 

P0442 means the EVAP monitor detected a leak approximately .030" in diameter, (about the diameter of a pin). Could be a leak in the fuel filler neck, filler neck vent line, fuel tank, fuel cap, vapor line that you mentioned, purge canister, vent solenoid, control solenoid, pressure sensor O ring, fuel pump module O ring. It can be a real challenge to find it.

 

if you can do a smoke test that should pin point your leak smoker is pretty easy to make there are videos on you tube

 

Yeah, I see this is a real complicated problem. The smoke test it seems will need to be done regardless if I can do it or not. Ugh. My vehicles is due for inspection in April and the government will probably not allow it to pass over a pin size leak. We have a lot bigger problems in our government than pin size leaks in EVAP systems.

 

What do you think would be the best way to go about it? I'm not into making any smoke machine, because I wouldn't have all that stuff around. So here my thoughts, go replace the parts it very well could be. My vapor line is rusting, maybe the purge valve, any other commonly eval fail parts to this vehicle? Or just go to a mechanic to do a full diagnostics? Would dealers be better than an independent shop? Or both?

 

I would replace the rusted section(s) of line, clear the code and see what happens...

 

Without proper testing/diagnosis, your option is to start guessing

 

I'd fall back on that testing stuff if I still had a code after replacing the rusted lines and resetting the codes!! Ha!!

 

It first came on when I started the vehicle. No going off anytime since. I even tried disconnecting the battery. No help.

 

One has to clear the code with a code reader...