The PCV hose may crack, causing the vehicle to idle roughly, this may or may not illuminate the Check Engine Light.
Average mileage: 157,118 (110,230–218,000)
Engines affected: 4.6L V8, 5.4L V8
28 people reported this problem
Rough idle, stalling on my 2000Expedition. Code came up as PO171. Found a leak in my PCV hose at bend. This is a Ford only part. Went to local Ford dealer and ordered the hose with the PCV valve included. Replaced it myself. Problem solved.Ford part # 2L1Z6758GA.
idled roughly, would die after idling for a few minutes, but when going down road would drive fine. pcv hose broken and was replaced, fixed problem
Starts fine , starts warming up idles at 1.000 starts down to 8.,500 -9.000 then goes back up to 1.000 then down to 300 then up agin then back down a couple of times then stop running starts right back up though ?