5.4

  1. M

    My 5.4 3v valve spring compressor won’t start threading

    Hi everyone after compressing the spring and take out the keepers ( of course my piston on tdc with rope method ) I replaced the valve seal then trying to reassemble my spring and retainer I got problem that i can’t start threading my tool to compress the spring I provide I photo Also I...
  2. NorthernExMax

    My Expedition build thread

    Hello all! I wanted to make a small list of the things i have been doing to my expedition and will continue to update it as I go. Day i got the expedition- oil and air filter change. https://www.expeditionforum.com/threads/tune-up.58512/#post-530801- 7/8 spark plugs, and 8 coil packs. CM5243...
  3. NorthernExMax

    Tune up

    I did a tune up today, had bought some “performance” motorcraft injectors for the 5.4 (was originally a mopar project but i think they were the injectors for 16+ v10s?) several years ago and they have been sitting on the shelf waiting for a viable project. Well today the spark plugs and ignition...
  4. NorthernExMax

    New to the site

    Hello! I have been active on other forums for my other vehicles but just got an expedition! I am a little familiar with them, mostly the powertrain, but we love this one! Used to drive an excursion (v10), 01 4.6 f150, multiple v10s in f250-550s, and worked on all of those. This is actually my...
  5. S

    5.4L 3V 2008 - "genmod_ls" = "fault low" - P0625

    Hello, I'm from Germany and I'm working together with an experienced Ford mechanic (specialized in 7.3 Powerstroke) on a Ford Expedition of an acquaintance. It is a Ford Expedition from 2008 with 5.4L V8 3V. It has a gas system installed and the previous owners have made a few messes...
  6. J

    5.4l low power with WOT

    Originally I had P0171, P0174 (Bank 1 & 2 lean fuel mixture). I found the air filter damaged likely causing a dirty MAF sensor. I cleaned MAF and reset the CEL codes. Fuel trims seem better so this might have fixed this but during test driving I found it has little power at ~80% to WOT. If you...
  7. 2

    Oil Pressure Gauge

    99 5.4 My oil pressure gauge is acting strangely. After the oil change, and not even a 1,000 miles later. The gauge wouldn’t come up. I checked the oil. It was only on the tip. I put 2 quarts and it came back up to normal or maybe even a little more. Since the added oil. It seems like the...
  8. G

    5.4l Overheating Problem

    I just wanted this to be out there for others to find, I had a very hard time finding anything. 1997 Expedition 4x4 EB tow package 5.4 Air Suspension 165,000 miles currently. 1. Middle of winter, poor heating, kids are cold. According to you folks, common heater core plugging. 2. Flushed...
  9. K

    Why do i keep getting lukewarm air

    I’ve about had it with this. Have changed my thermostat, coolant is good, purged the system everytime now and unclogged my heater core 2 weeks ago. Was working perfectly fine for about a week before it went bad again. If I accelerate heavy it does heat back up but then goes lukewarm. Is it...
  10. k-bl

    Documenting: 2014 5.4l 3 valve early oil pump and tensioners upgrade

    I am an engineer by trade, and I like to document and test things. I've always worked on all my cars and have generally done a good job at it. I've found a lot of incomplete stories about upgrades of our beloved 5.4l regarding oil pump and tensioners which caused me to spend a lot of time...
  11. J

    Help identifying this popcorn noise (08 Expo 5.4)

    Sometimes does it at idle and almost always does it a low speed. It sounds like metallic popcorn, and I haven't had any luck identifying the source of the sound on my own. 08 Expedition King Ranch 5.4 Triton with 130,000 miles. No noticeable change in performance. Hopefully someone has heard...
  12. C

    Which model of Motorcraft Spark Plugs works in my 97 5.4 XLT?

    All the auto parts stores recommend the SP-459 ones which are so hard to find here in Mexico, some website suggest me to use SP-493 and SP-479 confirming that those fit my expy, but I cant find info that say they actually fit. I've searched so much in this forum and others but could only find...
  13. AksoBruce

    5.4 rebuild

    I'm wondering if anyone has had any difficulty rebuilding a 5.4, because I am looking forward to it on my Gen 1. Not really looking forward to it, but it's either rebuilding myself, or getting a long block and swapping. I did an oil change this weekend and the oil had a very strong smell of...
  14. nycnftm

    I'm probably the only one who had this problem

    Someone once said, things happen to you that never happen to anyone else ever... Stuck in traffic, decided to recline the seat a bit. When I reached for the lever I cut my finger, and it was messy and hurt. Had to look down and see what caused it when got home. Photos below. I tried to bend...
  15. E

    Not sure whats wrong. OBDII Live Data

    Picked up a 2000 Expedition 5.4 Eddie Bauer 4x4 175k miles I think after wrecking my 98 expo. Got it from a local guy said it had a little hesitation at idle but wasn't really worried after having done everything on my last truck figured probably plugs or coils. Got it home pulled throttle body...
  16. J

    Catalytic Converter Replacement

    After dealing with a ton of no-start, misfire, and excessive rich conditions, I believe my passenger side catalytic converter is done for. My 05 Expedition EB 5.4L 3V 4x4 takes some time to start. It cranks for a good 5 seconds when cold starting and has a rough idle in drive gears and...
  17. Prince_Polaris

    Are the cats why I have no engine power?

    [This is a 2003 Expedition, with the 5.4L V8] Okay, remember my complaint a while ago about spark plugs? Yeah, that wasn't the problem with my performance. What happened with those was: Mechanic number 1 fixed vacuum line, and didn't put on the new one correctly. Mechanic number 2 fixed the...

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