Hey fellas. Scanned the '04 GTP tonight:
P0455 Evaporative Emissions System Leak Detected - Gross Leak/No Flow
No visible leaks or disconnections anywhere. Gas cap is in good condition.
So, do I have to replace a part? Take off the EGR and clean it (if so, best method?)?
Anyone have a general troubleshooting guide (checked gpona's manual, recommended some kind of smoke test to start troubleshooting... so I guess that would mean taking it to a dealership)... like a list of likely/cheap replacements or tests?
Thanks in advance!
Edit: Further research seems to indicate that the "evap canister vent solenoid valve" located in the driver's side rear fender gets dirty and can be cleaned by removing the wheel, wheel well, pulling the thing out, and hitting it with compressed air and carp cleaner. At least, I guess this is something that's almost free to try before throwing money at it. GM Part# 25932569 EVAP VALVE... in case I break or just need to replace it after all.
No time to do it until Saturday, so still open to suggestions.
