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My neighbor is still trying to figure out his F-150 5.4 engine problem. The engine bogs,and runs rough almost to the point it’s going to die. After doing some research and making sure the throttle body was clean this is the next thing to check.
Does anyone know how to check a vct solenoid to see if it’s bad?
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found this link. see if it helps
heard complaints and have seen this problem several times. If it is the design i am thinking, ford had a strange EGR design where the egr tube goes through the intake and a common problem was that the back side of the tube would get very carbon-ed up and cause misfires and all sorts of problems. Unfortunately i do not believe it is possible to clean out with a coat hanger or such, Ford’s fix was to take off the intake manifold and let sit in parts cleaner for the night and then try and bust up as much of the carbon as possible.
not saying this is your problem because I cannot be sure. But simply a suggested common problem with Ford V-8’s. Hope this may help a bit
Quoted From Squibcat:
My neighbor is still trying to figure out his F-150 5.4 engine problem. The engine bogs,and runs rough almost to the point it’s going to die. After doing some research and making sure the throttle body was clean this is the next thing to check.
Does anyone know how to check a vct solenoid to see if it’s bad?
Since no one answered your question try this (about halfway down, if it will help) http://teamzx2.com/threads/35-Cleaning- … T-problems Hope this helps answer your question and solve your problem. I don’t really know very much about that vehicle. A good scan tool would probably help too. http://www.f150online.com/forums/2004-2008-f-150/429764-p0012-running-retarded-1-bank-both-vct-solenoids-test-ok.html
There are some great suggestions above but don’t overlook the obvious like your tune up items or checking for voltage leaks or vacuum leaks, many performance problems are often the result of these simple things so try not to forget to check the simple stuff first.
Vacuum leakshttp://www.youtube.com/watch?v=9CPqbaSgcok+Voltage leakshttp://www.youtube.com/watch?v=x-U9WqJfaJsChanged out the VCT solenoids today and still a problem. I went for a ride with him and in the beginning no problems. Then after the engine came up to temp, the rough idle started again. It’s intermittent. He also stated that when he’s on the interstate he has to shift out of overdrive for the engine to quit running rough. Another thing is if the truck is at or above 2000 rpm, no problems. The rough idle almost sounds like a knocking of some type.
Here is the work that’s been done so far. Cleaned mass airflow sensor, cleaned throttle body, changed vct solenoids, changed cam positioning sensors, checked for voltage leaks.
Looking on the net I see a large amount of people with the same issues as this, but no real solutions other than what has been tried above.. The threads just die. I was hoping I could find a Ford mechanic on this site that’s seen this issue and knows how to repair it. Now I haven’t done a vac test on it yet, so I think that’s next. Also would a fuel filter cause this as an intermittent problem, or spark plugs. I was thinking that with plugs or a bad fuel filter that this would cause problems from the first minute the engine was fired, not after it’s warmed up.
This site has been a great help on many of my projects and I appreciate all the helpis the right viscosity oil being used? did any codes pop back up?
can mechanical timing be checked. try spraying the connectors
with brake clean for the vct connectors.The correct viscosity of oil is being used. He also ran another check for the codes. The first is P0340 . The readout states that the cam positioning sensor is bad or wiring is bad. Those have already been replaced. The second is 0012, cam timing over retarded-bank1 Cause, 1 -cam timing incorrect 2- vct solenoid stuck open. The VCT solenoids on both sides have been replaced with genuine Ford parts. After the solenoids were replaced he pulled the battery cables and reset the computer. It drove fine for about 15 minutes. Had great pickup and sounded like it was running well. After it fully warmed up it started to run rough and was knocking really loud. It doesn’t continue all the time. When the vehicle slows down then it starts to sputter and knock, but like I said only intermittently.
If it were a timing chain issue, wouldn’t it start off running rough?You could pull the cps and clean it and reinstall it and see if
the problem gets better. also clean the connector.
you could also have low oil pressure or it could be
gummed up in the vct. Is the oil level correct?http://www.youtube.com/watch?v=ufj-7YNGLtk
http://www.justanswer.com/ford/5nqm6-19 … uit-v.html
Quoted From college man:
You could pull the cps and clean it and reinstall it and see if
the problem gets better. also clean the connector.
you could also have low oil pressure or it could be
gummed up in the vct. Is the oil level correct?http://www.youtube.com/watch?v=ufj-7YNGLtk
http://www.justanswer.com/ford/5nqm6-19 … uit-v.html
+1 with this post.
Also just because you have a code for a particular sensor, it does not mean it is bad. Thats why you need to test and diagnose before throwing parts at a vehicle.
I would highly suggest a factory service manual so you can follow the engineers flow charts.
Did you use OEM or aftermarket parts?
Seems like we’ve (the forum) have been here before. I just did a quick search of past posts and couldn’t find the reference to it but if memory serves it had something to do with clogged oil passages or something like that? It is interesting you have that code however because before I read that I was thinking you could have an issue with a vacuum leak as with what you describe I think it’s a distinct possibility, here’s a link to a video on the process of finding those, I still think it’s worth checking.
http://www.youtube.com/watch?v=9CPqbaSgcok+
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