Question about 2004 Ford Expedition

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My 2004 Expedition 4.6 ltr. has a rough idle. It goes Up and down and will stall at stop signs and traffic lights. Where can I find the PCV valve?

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PCV has nothing to do with drivability or any thing else pertaining to engine performance. It regulates the air flow out of the crankcase to burn blowby gases from the rings. It never needs to be replaced,just cleaned every four years. That is if you have no hose leaks.

Buy some CRC Throttle Body Cleaner and follow instuctions.
I wouldn't even run engine,just spray and clean throttle plate.
Plate is sticking open and throwing TPS Voltage off at idle. PCM is trying to figure injector pulse, with wrong info,thus rough idle.

Posted on Sep 28, 2010

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Rough idle while in gear. There are no engine lights on. I replaced the spark plugs 6 months ago and seemed run better. Rough idle came back, so I cleaned out the PCV valve and it helped for the short...


Are your rpm's low when sitting at a stop light and vehicle warmed up? You could check your TPS (Throttle position sensor) or maybe your egr is plugging up, or one of your plugs or wires could have gone bad, maybe the coil on one of the wires is bad. You really need to plug a code reader into the ECU and see if there is a code being thrown. And NO, all codes will not cause the engine light to come on.

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Loss of power, but no mention of rough or inability to idle (including stalling). If those additional symptoms are part of the problem, check for a vacuum leak to the intake. Listen for hissing or sucking noises near air hoses. Look for loose, cracked, or broken air hose connections. Check PCV valve...Cheap to replace, could be sticking, then loosen after truck sitting with engine off. A vacuum leak will not give any light indications, and vehicle will seem to run normal when applying gas, but will want to stall or run rough (or want to stall) when at idle or sometimes when taking foot off gas when slowing down.

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you have a vacuum leak somewhere check your pcv valve first if o.k. get a couple of cans ( cheap carburetor cleaner ) and start spraying all vacuum lines THIS ONLY WORKS WHEN THE CAR IS RUNNING when the idle drops there is your problem

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Check the idle fuel pressure. Load the electrical with headlights and heater defrost etc and see if problem gets worse. Attempt again with all accessories off. Could be fuel pump is getting low voltage at idle or fuel pump is failing. Bad fuel pump would definitely be a problem high fuel demand. Check vacuum line between pressure regulator to intake manifold.

Check for a air leak in the intake manifold. Gasket/hose etc. The P0171/P0174 is an indication that not enough fuel or tow much air. You can sometimes hear the air leak during idle.


Best solution is to use a graphic capable scan tool and watch the fueling trim/idle.


scan-tool-software-graph-a-rikgbt5tk1ywbo1m3dxzkw2o-3-0.gif

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Engine malfunction light on all time drives ok but when stop at traffic lights etc ref counters go down and stalls


IAC problem . You have a problem with you idle air control valve. So when you stop at a stop sign the RPM goes to low and you stall out. IAC controls the desired speed necessary to keep the engine running.where is this sensor at is at the rear of the engine compartment under the thtottle valve. Here is what you need to inspect for. If you have a vacuum leak in you engine system, the IAC cannot compensate or control and you get rough idle. Check any loose vacuum connections .

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I have a 4 liter V6 2003 Ford Explorer ( 2 door). The check engine came on and then it started idling rough. When it idles rough the AC blows hot. Recently it has started stalling when idling at a...


Hello! Most probable cause is a leak in the vacuum line or broken elbow connection to the Positive Crankcase Ventilation (PCV) valve...Check PCV and its vacuum line...Send results...

Guru..............saailer

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My 2004 Ford Expedition 4.6l has a rough idle and occasionally backfires. My check engine came on and I had it diagnosed and it said it was the O2 sensors. I changed all 4 sensors and the mass air. I...


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.

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There is a plastic tube that goes between the PCV valve and the intake manifold. Inspect the rubber elbow ends of this tube very carefully, they deteriorate and cause a vacuum leak that causes stalling. Sometimes you can hear them hissing while the engine is running. This is a very common problem.

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