Well i'm sorry that you got the miss information here on fixya. because all internal combustion engines need a pcv valve to operate properly.
now the information you got first is correct and pcv valve can set false codes like o2's and lean bank conditions also can cause you vechile to run or idle rough.
no there are a few different styles pcv valves and some times don't look like your convetional pcv. some are heated in different ways either by coolant ( witch look like a conventioanl pcv but with a coolant tube around them) then electricaly heated and they don't look like them at all. but one thing that has to stay the same is the pcv valve has to ventilate the crank case and will be found somewhere on or near the valve cover because it is the easiest and most accessible point of the engines crank case area. so i would look for that and usally on that vechile it is on the passanger side valve cover in the middle.
with that said and seeing you did all those repairs i would go right for that as my next step. but there is other thing that cold cause this issue like leaky injectors and is almost more likely becuase of the o2 sensor code and backfire. do you have the code # so i can look it up and best assist you?
see vechiles are hard to fix over the computer as i am trying so if you have any more question/info about this issue please ask and i will be glad to help.
Testimonial: "Cool thanks, i'll check the pcv valve/ line going into the back of the intake, if that doesn't work i'll go for the codes again....thanks again...."
Have you checked your vaccuum on the intake? It sounds like it could be an air leak... Go to the local auto parts store and pick up a vaccum gage... There are some other ways to maybe find it as well like using an unlit propane torch or WD40 in areas of the intake manifold, EGR can also cause low vacuum... Not sure if this is the correct path but it could be....
Testimonial: "will look into it.....thanks...."
"My 2004 Ford Expedition 4.6l has a rough idle and occasionally backfires."
Sounds like you have bad spark plugs or incompatible spark plugs in the vehicle check to see if all the spark plugs are good(could have detective spark plugs even if they're new -- cheap spark plugs are usually the problem)...and use OE specify spark plugs or buy from dealer.
Testimonial: "thanks.....but on the back of the intake, the hose connected to the pcv valve was melted on the back side....."
I repl all plugs, coils, egr valve, cleaned throttle body and still have problems with my 2004 Ford 4.6L Experdition while starting on cold Florida mornings. Until the vehicle gets warmed up it does not want to accelerate, back off accelerator it will slowly speed up. It has a occassional miss while sitting at a light once warmed up........vtefire
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