The check engine light is keeping me from passing inspection in PA. It has a P0171-System Too Lean (Bank 1) code. I built a tee manifold to simultaneously have the MAP sensor and a liquid filled vacuum gauge hooked to the engine at the MAP port. The gauge is reading 18-19 "hg but when I look at...

I’ve been getting an intermittent P0171 code. I’ve cleaned the MAF & MAP with MAF cleaner, TB with TB cleaner, replaced the upstream O2, and sprayed starter fluid all over and can’t find a leak. I’ve reset the PCM a couple of times by removing the neg terminal and removing the PCM B fuse. But...

I have been working on a couple of problems on my daughters Colorado 2007 I4, 2.9. We bought it about 4mo ago and have battled a Crank no start issue since Day 1. Things weren't too bad until we had the A/C Coil and Heater core replaced. then it would die when slowing with the clutch in. Idle...

Ok so for the last month or so I've been trying to remedy a P0171 (System too Lean Bank 1) code that keeps coming on. I have an 05 3.5L Colly with a K&N FIPK2 57 Series intake. I am also getting a P0455 (EVAP Emissions System Leak (Large))every once in a while but much less often than the P0171...

Ok here is my issue my 2005 3.5L is throwing a P0171 (System Too Lean Bank 1) and a P0455 (Evaporative Emissions System Leak (Large Leak)). I thought it could be my evap solenoid so I took it off and cleaned it and cleared the codes. Since then, about two weeks now, the P0455 has stayed off but...