Esof
Thread Starter
|
Posting Guru
Joined: Mar 2005
Posts: 1,460
Likes: 0
Esof
Yesterday I turned on the ESOF and the 4x4 light illuminated in the dash and no four wheel drive. So I turned it off and you could hear a 2 or 3 second gear grinding. Today turned it on, worked a little then it disengaged agian. I know all about the ESOF not being reliable, use Warn, yada yada yada. ESOF is what I have and that is what I want. Any idea's why it would only partially work and what I can check to see why? Thanks!
99a F-250 Superduty 4x4 PSD
99a F-250 Superduty 4x4 PSD
Postmaster
Joined: Jan 2005
Posts: 2,753
Likes: 3
From: Phenix City, AL
If you hear a grinding, it sounds to me like the gear engaging the t-case is stripped. If it's working for a second or two then disengaging, it may not have enough to keep it engaged in the t-case.
Get the front wheels off the ground and turn on the 4WD. If you can still spin the tires and the driveshafts are not moving, it's vacuum related. If you can spin the tires and the driveshafts move, then the t-case is not engaging.
Tthat should at least narrow you down to vaccum or t-case motor / gear.
Get the front wheels off the ground and turn on the 4WD. If you can still spin the tires and the driveshafts are not moving, it's vacuum related. If you can spin the tires and the driveshafts move, then the t-case is not engaging.
Tthat should at least narrow you down to vaccum or t-case motor / gear.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 422
From: Long Island USA
To me, knowing a LOT about all failure modes of ESOF hubs, it sounds like the hubs are not staying engaged.
The first vacuum pulse is 45 seconds long or so. If they stay locked for 45 seconds and then disengage, the hub is faulty. There is a toggle-type setup inside and if they are unlocking, that toggle setup is not latching in "lock".
First thing to try: Lock the hubs manually and see if you loose 4wd. If you still loose 4wd, sounds like the transfer case.
With the hubs not working correctly, the transfer case may not complete the shift into 4wd if you're moving. And if you are moving and the hubs aren't locking when you turn the switch, you WILL hear something as the transfer case shifts.
There's nothing wrong with my transfer case, but I did get some grinding noises in the transfer case with the front driveshaft speed-mismatch when I was having hub problems.
Try manually locking the hubs before we go any further.
The first vacuum pulse is 45 seconds long or so. If they stay locked for 45 seconds and then disengage, the hub is faulty. There is a toggle-type setup inside and if they are unlocking, that toggle setup is not latching in "lock".
First thing to try: Lock the hubs manually and see if you loose 4wd. If you still loose 4wd, sounds like the transfer case.
With the hubs not working correctly, the transfer case may not complete the shift into 4wd if you're moving. And if you are moving and the hubs aren't locking when you turn the switch, you WILL hear something as the transfer case shifts.
There's nothing wrong with my transfer case, but I did get some grinding noises in the transfer case with the front driveshaft speed-mismatch when I was having hub problems.
Try manually locking the hubs before we go any further.
Trending Topics
Thread Starter
|
Posting Guru
Joined: Mar 2005
Posts: 1,460
Likes: 0
UPDATE: Today when I turned the ESOF back on, it seemed like it stayed on correctly this time....what would if anything would this be different than already posted? Still at work and have not had time to do any of the diags above.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Postmaster
Joined: Jan 2005
Posts: 2,753
Likes: 3
From: Phenix City, AL
Well......my concern would be that grinding you were getting.
"Maybe" it was just a fluke thing and parts weren't quite lined up, but..............before it happens when you really need it, I would get that t-case engagement gear checked, along with the vac lines.
"Maybe" it was just a fluke thing and parts weren't quite lined up, but..............before it happens when you really need it, I would get that t-case engagement gear checked, along with the vac lines.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 422
From: Long Island USA
Originally Posted by Medic 66
UPDATE: Today when I turned the ESOF back on, it seemed like it stayed on correctly this time....what would if anything would this be different than already posted? Still at work and have not had time to do any of the diags above.
Roll of the dice.
Too small of a statistical universe to determine cause.
Thread
Thread Starter
Forum
Replies
Last Post
86fsbronco
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
6
Mar 5, 2015 10:54 AM
afonda
1999 - 2003 7.3L Power Stroke Diesel
18
Feb 28, 2009 07:51 AM