Well, its emissions test time on my new disco. I pulled the following engine codes and would love some opinions on where to start.

CURRENT
P0453 - Evap emission control systems pressure sensor high input
P1300 - ?

PENDING
P0003 - ?
P0300 - Random/Multiple Cylinder Misfire
P0301 - Misfire Cylinder 1
P0305 - Misfire Cylinder 5

I have no idea where to start with P0453 nor P0003

I'm looking at the MAF sensor for the misfire codes.. Truck wont idle and just dies maybe once a week. The previous owner had a new sensor installed and looks like he also replaced the plug and did an EXTREMELY poor job of crimping the wires (used yellow butt splice on 18ga wire, wtf was he thinking? )

Going to cut, solder and heat shrink like he should have...

I'm have a set of STI wires and bosch platinum +4 plugs I'm going to put in the truck tomorrow or monday.

Any help with be appreciated. Thanks.

 

Sorry to hear the problem. Try your plan with a good tune up. If you get to the coil and change it while youre there, then much better. Once removing the plugs, check the coil end and see if theres some sort of corrosion, usually the greenish stuff. That side is close to impossible to check if there are signs of corrosion when attached.
Get half tank of the best gas and add some additive of your choice or better yet, sea foam. Check your gas cap if sealed properly.
Start and rev engine 2500 onwards for few mins.
Good luck.