Johnnyd359

Scott Mclay

I brought it in on New Year's Day and when they started it up the morning after New Year's that Wednesday was when the tech heard it

KMDColo

Harry Franklin

There has been a known problem with the ouboard phasers causing a warm idle knocking sound, almost exclusively on the passenger side. Mine were replaced for that reason. Solved the knock, but did nothing for the rattle.

RJ06FX4

My truck is the 5.0 with the same rattle. Listening to it with the stethoscope yesterday it is the loudest up top which isn't new news. The noise is almost equal on both sides The main chains don't seem to be rattling. Could be either the secondary chain tensioner rattling during phaser movement or the phaser itself making noise somehow. Seems unlikely phasers would fail on both sides at the same time but who knows. Really shouldn't be too hard to figure out. I know some are looking at the tune and say rapid movements causing chain to chain lash. Maybe it could be the secondary chain tensioner not up to spec or too weak for the application. Seems like if the chains were tensioned like they should be it wouldn't matter so much how the phaser moved. Mine didn't do it new was quiet for 5 months before it started. Someone will figure it out eventually.

RJ06FX4

Just went out and took this video.
https://www.youtube.com/watch?v=xStw...ature=youtu.be

you can see the secondary guide/tensioner and the chain. Doesn't look like's the chain is rattling to me. The noise is coming from the top more loud on the outboard phaser side

w00t692

Now that is a 5 liter so the same theory doesn't apply for rattling chain, but the fact that it makes the same noise at least gives some hint as to what's up.

Definitely sounds like the phaser itself is making the noise.

Now, get closer to the hole, get tons of light in it, and shoot a slow motion video while this action is taking place.

Harry Franklin

Yep. Like I mentioned in the other thread, if he had access (or if it even exists) to a high speed inspection camera, we would be able to determine exactly what is going on.

RJ06FX4

I'm leaning to think it is the phaser itself also. The video might be a little unclear but I can see with my eyes that there isn't abnormal movement. If it was the chain making that much noise you would see a vertical vibration in the tensioner, or at least some chain lash of some type. I think Ford has some bad/noisy/poorly designed phasers. Some start out bad, some show up later on. The phaser seems to be operating normal other than the noise or else the guys checking the tunes out should have noticed them deviating from the computer commands. Probably going to have to wait for Ford to actually fix something or maybe have to try aftermarket parts whenever they are available? But that is just my thoughts could be wrong but that what I'm thinking just by using my eyes and ears.

w00t692

Yep even during the noise they don't deviate. They jump through so many mapped points so quickly that if i modify how far it moves it makes less and less noise the more i alter how much it moves returning down to idle or to lower rpms.