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
SOURCE: obd code P1131 and PO174
P1131 - Heated Oxygen Sensor (HO2S) Circuit Low Variance Bank 1 Sensor 2
P0174 - Fuel Trim System Lean Bank 2
Clean the MAF sensor and check for vacuum leaks at the intake manfold or the injector O rings.
SOURCE: after driving for 15 minutes truck stalls,restarts
put a OBD II code reader on it see if it has stored any codes if not replace the TPS sensor and the MAF sensor do the replacements at different times so you don't buy one or the other for nothing
SOURCE: 1998 FORD CONTOUR CHECK ENGINE
sounds like EGR valve and sensor this controls idle speed when at a stop. the po171 is a burn lean or rich code need to know what bank 1 or 2. also check for a vacuum leak from one of the hoses.
SOURCE: Ford E-350 2001 V-10 gas.
Check your fuel vapor recovery system, your van has unusual set up, and the effect is RAW fuel gets purged, rather than vapor.
The dead giveaway test is does the issue happen on light acceleration? Does it stop if you let off the throttle? Can you accelerate harder and "get past" the issue?
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