So my 2001 Formula (ls1), has been overheating a lot lately and I cant figure out why. It will run normal (about 180-190) for while, but when I begin driving around it will slowly increase. When I bought the car in May this year I had a brand new radiator put in and I check the coolant which was fine. I also have the p0171 code (system running lean) but I checked my pcv line and cleaned the MAF but the code keeps coming back. It isnt on ALL the time and will go out randomly.
Any help would be appreciated!

 

Ended up finding a crack on a small piece of hose between the the pcv line and pcv valve and fixed overheating with new thermostat

 

do you still have the code? and how exactly did you check the maf?

 

trust me had same thing with my car you need to check ur relay fuses, they r not what these mechanics check instead they will tell u it’s this or that meanwhile ur bank account will dry up, so please check them they can cause all kinds of codes that will **** u off.

 

Well, at least the thread wasn't QUITE a decade old when you resurrected it.