I've owned a 3800 of some sort for about 10 years now and am fairly familiar with them. my current impala (2004) is popping the p0446 code and I have tried the following to clear it:
1. evap canister valve leaking, replaced with new.
2. purge valve was original unit - replaced with...
I have code P0446 Control System Vent Circuit Malfuction.
Check with my mechanic, and he said it delt with the filler pipe.
Well got it home, took the wheel off, and the filler pipe guard out. Found alot of rust, and dirt. The filler pipe seems fine, now dectecting any holes.
But on top of the...