1998 Ford Expedition V8 Two Wheel Drive Automatic 145000 miles
My 1998 Ford Expedition, 5.4L was running good but idling rough. I was getting codes P0171 and P0174 from the ECM. Found the hose to the pcv valve was nearly ripped in half. Replaced that and it seems the problem is solved. Will the check engine light reset itself or should I have it manually reset.
Things I have done since the check engine light came on:
Changed EGR valve
Cleaned all EGR connection points
Changed EGR sensor
Changed all spark plugs and #1 coil (tested bad)
Changed pcv valve and hose
Changed air filter
I am hoping this will solve the emission problem so I can pass inspection.
Saturday, January 26th, 2008 AT 6:15 PM