05- 5.4l3V Large Loss of MPG
10-06-2014, 04:58 PM
#11
Junior Member
Thread Starter
Join Date: May 2014
Posts: 13
Likes: 0
Received 0 Likes
on
0 Posts
If you are talking about the foam gasket on the outside edge of the filter box that the plastic filter door presses against, then yes I have checked it and it is still in good shape. No dry rot or flaking. Gasket looks and feels good. Makes a tight compressed seal when door is clipped on. If you are talking about another gasket, please tell me which one. There were no pictures on the linked thread.
10-06-2014, 09:42 PM
#13
i have a 4.6l v8 so i dont have these problems, but i have a guy i work with that has a 2006 4door fx4 with the famous 5.4 hes had it sense it was new hes had th etranny rebuilt and also did that list of things u did at 145k when his started this the stock oil guage wont tell u but him and a mechanic hooked an aftermarket oil guage to it and discovered it was dropping oil pressure so his 5.4 is done but when he does drive it it sounds funny like u say almost like it jumps timimg it runs bad and hesitates to go. the 5.4 is very famous for this. after the cam sensor or timming chain service or at least have it looked at the logical thing to do is trade it in 5.4s are badass before 100k then they have problems but however some dont thre are some that have 205k on them and never have problems but they all still have that tick. its just a freak thing dont take it to ford either they will charge you out the *** and not fix your problem.
There you go....
The following users liked this post:
lewissa81 (10-06-2014)
10-06-2014, 10:01 PM
#14
Senior Member
I thought about the CAT. Check on my scanner and the bank 1 #2 o2 sensor was fluctuating a bit more than the bank 2 sensor, so I replaced the bank 1 CAT. No difference. Read about the phaser issue which is where I'm leading to, but most of the posts say that the noise gets worse when warm. In our case its the same weather its warm or cold. We actually have less lag in accel when its cold, but the sound of the engine is still the same. Would changing the Cam position sensor or the VCT be next, or just dive into the entire CAM/timing chain/tensioner rebuild? Also, through this whole process, the truck has never thrown a code or misfired. Could the timing chain on bank 1 have jumped a link and that is what is causing it to run rich and sound this way?
What type of sounds is the engine making, and can you tell where they are coming from? I kinda wonder if you have one or more lash adjusters that are sticking.
Compare the fuel trims between both banks. Your short term and long term should be close between banks. If one bank has a significantly lower or higher stft or ltft than the other bank, then that may help you narrow down the possibilities.
My gut feeling says to take care of the noise your hearing first, then see what you have to work with.
