1996 GMC Jimmy, 4.3 DUH! DTC codes p0172 and p0175 pop up. Truck runs great, starts great and i cant even tell there is an issue but my computer says there is. Regaurdless i need to figure out the issue. MAF and MAP readouts seem good. I would like some ranges of what my sensors "should" be saying so i can narrow down what is causing my issue. I did notice my fuel trim is at about -13.xx on both banks (ST FTRM) at operateing temp. If i'm corect that means it's trying to lean it out like crazy right? This is at idle.

Can someone hook a reader to their truck and tell me what all the sensors read at operating temp.

 

Do you have a k&n intake or filter?

 

I have a Spectre aftermarket filter. Not oil charged. It's dryflow.

 

So you have already checked the maf for dirt? How about the vac line going to the map?

 

the MAF sensor seemed clean, i cleaned it with brake parts cleaner anyway. The MAP reading looked normal when i viewed it with my scan tool but i didnt check the vacuum line for it, where is it?

 

You cleaned the maf with brake cleaner? You may have damaged it. You should only clean a maf with electrical parts cleaner. I need to check out how rhe map is set up. If it is attached to the manifold then it may not have a vac line.