Ford did work on my engine taking it down to replacing the cam.
Since then I have had wierd vibrations at 1100 (overdrive under load) and 1800 rpms. I replaced coils twice. My brother who was a certified mechanic (Now flys Corprate jets) told me there may be a harmonic inbalance in the engine. Is the engine balancer IN the engine or on the outside?
It's a 2004 5.4 3v..engine..

Thanks

 

Outside. Mounted to the crank. Your serpentine belt runs from it.

 

Ford Modular engines are what engineering calls internally balanced. It is not adjustable or anything its actually the machining of the crank...thats not your problem. But a bad damper, missfire, or a few other things can cause a vibration obviously. I would suspect a low level missfire which sometimes will not throw a code, Another thought is these engines will develop a vibration if the oil fill is to high. A quart or more to much oil and they can vibrate. I saw them put a stop ship on every car coming off the Wixom assembly one time because of a vibration issue. We found the oil fill machine putting over a quart to much oil in every engine. Do you get any codes?

 

I remember your numerous threads regarding cop's. Which brand did you end up using and what plugs? Sounds like a typical low grade misfire. Are you sure it is engine related and not drivetrain?

 

The oil level is fine. I put Borg Warner COPS in. The vibration is cyclical.
It gets rough then in seconds gets softer, then again rougher..
It only seems to happen at approx. 1100 and not as bad, at 1800 RPMS.. usually in overdrive under load. Since Ford did the work, I'm guessing Motor Motorcraft..Plugs..
Before Ford did all the work on my engine ,almost 3 weeks worth, I did not have this problem.
It literally started when I got on the highway about 3 minutes after picking my truck up. I took it bad, but as usual "they did not find anything wrong"
So it's not a constant vibration like an out of balance tire..

 

Also I had a different Ford dealer take it for a ride and he definitly felt it. He thought torque converter. He did a test and said it was fine...I'm going crazy trying to get this fixed..

 

Another thing I forgot to add. After new COPS it idles smooth as silk. But after driving it for awhile it gets rough again. Actually it seems to lessen the vibration, but then everythig goes back to what it was pre new cops...

 

FORD might have stretched a timing chain on the bank they replaced the cam on. I had a friend with 3V truck that had a similar issue to what you describe and it turns out it was a stretched chain. It got stretched when he changed Phasers. He torqued the phaser bolt with the chain on using the chain to hold the cam while torquing the bolt. The chain didn't break or skip a tooth but was stretched, you could not even visually see the issue but after replacing it the vibration was gone. The vibration was around 3K RPM on his and only when under load.

Does it sound like it's coming from one side or the other of the engine? On his you could really tell it was on the passenger side when sitting in the drivers seat. My guess is if you had to have cam replaced it was the passenger side due to the oiling issues with this motor on the rear passenger side cam tower.

 

Sounds to me like a bad COP especially since it does it under load. The dealer may have put the engine one tooth out of time as well. The timing chains will break before they stretch sorry never seen one stretch.

 

I have seen them stretch. I will post up pic later when I get chance. I had one that was 1/8" longer than the other.

 

Let me backpedal on the stretch. I should say that I have seen many engines with well over 300,000 miles on them run perfectly well. In other words the chains never wore or stretched enough during that amount of accumulated miles to cause a drivability issue. Broken chains are rare as well unless the cams seize or start to seize in the cyl head cam bearings then they will snap like a rope. I would bet that its either a bad COP or again the dealer reset the timing chain off by one maybe two teeth although two teeth off will usually but not always bend a valve. It is easy to set the chain off time if the tech is not familiar with timing these engines. Take it back to the dealer and demand they fix it right as it ran fine prior to the repair.

 

work on my engine ,almost 3 weeks worth, I did not have