Good Morning Everyone...I am new to this post and it has saved me on numerous occasions with my Vibe. I own a 2006 Vibe and use it as a work car so it gets lots of mileage(150K). Anyway, I bought this car 2 years ago and have had fuel running lean issue since I bought it. Intermittently I will receive a P171 CE code especially during the winter months or when it is below 50F outside. It runs around 600-800 RPM on idle and surges back and forth from there to around 900 RPM. I have worked on or replaced the following in order: Changed Spark plugs, Cleaned fuel injectors, Cleaned MAF sensor, replaced air filter, Changed both O2 sensors, Tested all 4 coils ok, checked all vacuum lines, replaced cat conv, replaced intake manifold gasket. I still have lean fuel issues currently and getting really frustrated on what is actually causing this. I have already brought it to a mech and they said O2 but clearly not the problem. Does anybody have any suggestions on what to check next??
Thank You
Marcus>