Scanned fore codes has a po171& po174& po302..code po171 is bnk 1 lean..po174 is bnk 2 lean..po302 is cyl 2 misfire...changed plugs cleared codes test drive. re set same codes..noticed misfire accures from1350 rpm-1650 rpm. does not mss befor or after.i believe ther may be tsb on this issue.. any ideas..
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Lean bank 1 and bank 2 , and throttle actuator system fault. Check reason for lean codes 1st, vacuum leak(s), air inlet boot and hoses, or low fuel pressure / clogged filter. Repair as needed then clear codes and recheck .
PO171 and P1131 point to lean codes on bank PO174 and P1151 point to lean code on bank PO305 is missfire on cyl 5
the lean codes is probably a vacuum leak or maybe a MAF sensor is bad or dirty
missfire is dependant on engine if a V10 it may be a coil actually pretty likely on the modulars not uncommon thats for sure sorry forgot to add that its says missfire on #5 cant remember if that one is the first on the left or last on the left facing the engine vacummn leak could be those dang auto hubs got it stuck in the mud and they did not engage I need to buy some new ones took them apart to clean them out this summer
first PO171 o2 bank 1 s1 lean PO174 o2 bank2 lean PO401 cyl 1 misfire when an engine misfires the oxygen sensor will read the oxygen from that cyl sensor doesnt read fuel so every misfire is a air pump to diagnose we have to fix misfire first check the coil wires and plugs for cyl 1 use spray bottle with water run engine hot at idle spray wires with water if enging runs rough shakes or stalls then replace the wires dont spray with to much water if the wires are real bad you may not be able to restart engine
try this first once fix misfire clear codes and drive it
if the light is flashing it most like hasly some sort of misfire or converter failure, p0171 and p0174 is lean bank 1 and 2, replace you upper and lower plenum gaskets, while they have they off have they replace your ignition coil, plugs and wires, windstars are known for 2 things, lean codes,(plenum gaskets) misfire(bad ignition coil)
With those codes, the first place I would check is the fuel pressure. Also check the fuel filter and replace it if you haven't already. Then clear codes and recheck. Even if your fuel pressure is with in range it still may not push enough fuel to operate your vehicle.
check the pcv valve vacum lines for a leak a vacum leak will set 171 174 codes. lift the hood with engine running and listen for a air leak , check all vacum lines if no vacum leaks can be found then clean the mass air flow sensor by spraying carb cleaner directly on it for about 5 seconds. in other words take the air filter cover up and spray down the tube that leads to engine. shine a light down hose first and see if u can see the mass air flow sensor so u can get a direct hit