I just replaced my air filter about a month ago I noticed it was really getting dirty on the edge of the filter I looked at the seal around the tray and it was falling apart The pictures that are in my gallery are pictures of my sons tray My seal on my truck was worse than his I took off the old stuff off and replaced it with new I did have a rough idle some times But since i replaced the seal i havent notice a rough idle Check your seal on your air filter tray

 

i didn't think that was a seal just looking at the way the system works...but i'll keep an eye on it

 

mines gone? IDK it was falling apart so I pulled it off, we are talking about the foam strip right?

 

Yes its the foam strip It was there for a reason IDK why but my some time rough idle went away

 

The tray seals the felt gasket around the filter when it is clipped shut. The foam seal around th edge of the tray is just to stop hot air from the engine compartment from being sucked in around the edges of the tray.

 

When the cheap, and I mean REALLY cheap foam falls apart, you will have a droning sound when driving at highway speeds and you accelerate. I know this is a very old thread, but I bet there are a ton of folks who have this issue and don't even realize where the source of the problem is. I bought a roll of 1/2" X 3/8" thick weather stripping and replaced mine. World of difference.

 

Lots of remarks about idle related issues with the 5.4 and this seal failing...

 

Anyone have a picture of this?

 

I'm confident you won't need pics after this.

1. Raise the hood.
2. Pop the clips on the air filter tray.
3. Pull the tray out. (just like opening a drawer on a cabinet)
4. Look at the inside bottom and sides of the tray door. (it will be the cheap, deteriorated foam of which we speak, if any is left. If none remains, you will see the scotch tape like adhesive that once held the foam in place)

Might not be a bad idea to inspect your air filter while you are looking.

 

Will do.
I only ask for picture because I'd like to know what it was supposed to look like. My '06 came to me well used about 2 years ago and it was pretty neglected by the previous owner. "Ford Certified Pre Owned" did a few things really well, but IMHO they did an overall terrible job. So there's maybe a 10% chance one of techs replaced this already.

 

Here's mine. About a year ago I noticed that the original seal/weather stripping had rotted away. I replaced it with some felt I picked up from the hardware store.
Link to my garage pics:
https://www.f150online.com/forums/me...-box-seal.html

 

Hmm. Mine fell apart before I changed to the Volant intake, but I never noticed anything wrong. Must be a hit or miss kind of deal.

 

I should have mentioned above that I did not notice a change in performance or sound before or after I repaired mine.
I did it just because it looked like it needed to be repaired.

 

I did this and it keeps the MAF clean, I also took off the Snorkel and cleaned off the end that fits under the Air Tray and wrapped it with Hockey Tape about three wraps around and got a better seal NO MORE MOAN