1999 ford econoline 150
Country: United StatesMake: FordModel: E-150 EconolineYear: 1999Engine: 4.6
I have 2 codes PO 171 and PO 174 both saying running lean. What could be cause of this.. Its possible they are the original O2 sensors.
Hi, I’m Chris. Welcome and thanks for asking your question!
Only 5% of the time is this faulty O2 sensors. This is actually the sensors job to tell the computer and you of a concern. Your vehicle uses a MAF sensor which knows exactly how much oxygen came into the engine. It also used O2 sensors to see how much oxygen is left over after the firing cycle inside the engine. The computer knows what to expect and when there is a difference outside of the specs it flags a code like you got. The most common 2 possible faults are low fuel pressure from a clogged filter or weak pump or vacuum leaks at the intake gaskets or the vacuum and PCV hoses. 80% of the time it is a PCV hose leaking near the passenger valve cover. The easiest way to find a leak is to idle the engine cold and spray short bursts of flammable carb cleaner around all the possible leak areas mentioned and when a leak is hit, the rpms will increase.
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haven't forgotten you been without pwr from a storm all week. just getting back to normal.
Hope everything is well, no problem, just keep in touch.