Rough Idle Due to Cracked PCV Hose on Ford Expedition

The PCV hose may crack, causing the vehicle to idle roughly, this may or may not illuminate the Check Engine Light.

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Average mileage: 154,946 (110,230–218,000)
Engines affected: 4.6L V8, 5.4L V8
8 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003, 2004
26 people reported this problem
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problem details
2000 Ford Expedition - 5.4L V8 136,000 mi,
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.
1997 Ford Expedition - 5.4L V8 122,400 mi,
replaced entire pcv hose assy including valve
2000 Ford Expedition - 5.4L V8 144,000 mi,
slight missing at idle. getting code p0171 and 0174. pj177@sprint.blackberry.net
2000 Ford Expedition - 4.6L V8 208,000 mi,
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
2004 Ford Expedition - 4.6L V8 185,000 mi,
Egr valve was sticking. Replaced and fixed problem.
2003 Ford Expedition - 5.4L V8 193,000 mi,
Replaced with Bulk Fuel Line and resolved issue
1999 Ford Expedition 218,000 mi,
Was having problems with truck rough idling, then started to die. Took it to our mechanic said it was the main hose to the engine.
2002 Ford Expedition - 5.4L V8 130,340 mi,
Pvc line busted. broke air leaking car goes death if you don't press the gas.
1997 Ford Expedition - 5.4L V8 155,982 mi,
I had extremely rough idle and most of the time it would not idle. I replaced the PCV plastic line with rubber hose. It has fixed the problem.