Originally Posted by 1996 Bonneville SE
advance auto scanned it last night here are the codes...
MAP / BARO
CKT RANGE / PERF
VENT CIRCUIT MALFUNCTION
DTC PENDING CODES
After you finish your plugs and wires, reinstall your MAF screen. Fix the damage carefully or get another one. It isn't allowing your MAF sensor to get an accurate reading of the incoming air, and some of your misfire issues may be from running lean. Lean will also cause KR.
All of your codes MAP/Purge are vacuum related. Both the MAP sensor and the Vent/purge solenoid are vacuum controlled or dependent. Carefully inspect your engine to make sure the vacuum lines are attached to them and they are connected electrically.
The MAP sensor is mounted to the top of the PCV cap. Is it broken or cracked? Sealed properly? Did you reinstall both o-rings when you changed the PCV? Is it connected to it'* electrical harness?
Your Purge solenoid is mounted to a bracket that comes off the front cylinder head.
You can see it in this pic just above one of the two top valve cover bolts. See the blue connector? That'* the harness:
However, your 1441 code, while possibly related to the 0446, is a little different. It says your valve is flowing during a non-purge state. That would indicate the valve is mechanically stuck, but check all your lines and connections first. This should be a relatively inexpensive part at a wrecker or in our WANTED section if you need one.
A good way to check for vacuum leaks at both locations is to start the car and let it idle. Spray carb cleaner on each connection. If it'* leaking, it'l suck the stuff in, and you'll hear your idle change pitch as it combusts the car cleaner.
If cylinder misfires are present in nearly every car Advance tests, then nobody tunes up their cars. Proper maintenance and tune-up items will take care of that problem quickly.