Notices
1999 - 2003 7.3L Power Stroke Diesel  
Sponsored by:
Sponsored by: DP Tuner

4WD not working

Thread Tools
 
Search this Thread
 
Old Nov 17, 2003 | 12:57 AM
  #1  
BlackDually's Avatar
BlackDually
Thread Starter
|
New User
Joined: Oct 2003
Posts: 7
Likes: 0
4WD not working

Just having a problem with my 2000 F350....turn the switch on the dash to go into 4 high or low range and nothing happens, no lights on my dash, no hubs locking up....check fuses under my dash and they seem alright, anyone have any ideas???
 
Reply
Old Nov 17, 2003 | 06:41 AM
  #2  
powerstroker250's Avatar
powerstroker250
Posting Guru
20 Year Member
Joined: May 2001
Posts: 1,702
Likes: 0
Vacuum pump or vacuum lines going to the hubs.
 
Reply
Old Nov 18, 2003 | 12:30 AM
  #3  
BlackDually's Avatar
BlackDually
Thread Starter
|
New User
Joined: Oct 2003
Posts: 7
Likes: 0
I don't think this is a vaccum prob. cause i can over-ride that system and lock my hubs manually. pulled a couple plugs on the transfer case to check connection, 2 pin plug was clean with no voltage to it when trying the switch, 6 pin plug was clean and had voltage to pins but nothinbg would change when flipping the switch. Checked all the fuses and everything is good. I dont no about this ESOF stuff, seems a little unreliable to me, just need a damn lever to do the job.........
 
Reply
Old Nov 18, 2003 | 01:48 AM
  #4  
theologian's Avatar
theologian
Postmaster
20 Year Member
Joined: Apr 2001
Posts: 3,628
Likes: 0
From: Baileyton, TN
If you can use the manual ***** on the hubs to lock them, but not the dash control, then the vacuum system to the auto in the hub has failed.

Theo
 
Reply
Old Nov 18, 2003 | 07:30 AM
  #5  
SMB's Avatar
SMB
Senior User
Joined: Jan 2003
Posts: 194
Likes: 0
From: East Hampton, NY
And if the 4wd works when you lock the hubs, then the switch is engaging the transfer case. I don't know why "4x4" doesn't light up on the dash though. My truck (01 f250) was doing the same thing, but when I threw the switch to 4wd, it would light up on the dash even though the hubs weren't locking. Turns out crud had gotten into the stock hubs and they were all jammed up. I put in warn manual hubs and plugged the vacuum line.

-Shawn
 
Reply
Old Nov 18, 2003 | 07:55 PM
  #6  
BlackDually's Avatar
BlackDually
Thread Starter
|
New User
Joined: Oct 2003
Posts: 7
Likes: 0
Tried just manually locking the hubs but that doesn't seem to do it, transfer case doesnt seem to be engaging into 4 high or low range. Pulled my dash panel back to check switch wiring, it looks all good. Wondering if anybody knows about the G.E.M.(generic electric module)...not sure if it might have something to do with it....I'll keep looking ......
 
Reply
Old Dec 21, 2003 | 05:52 PM
  #7  
r507's Avatar
r507
New User
25 Year Member
Joined: Jul 2000
Posts: 19
Likes: 0
My 4x4 lights up but i tested it on some ice today and it is not working i even tried using the emergency brake to make sure the rears stopped spinning but nothing from the front.
User SMB, I would be real interested in any technical info you can give me on how to get the stock hubs freed up as I suspect that is the issue.
Am i correct in assuming from your post that when you switch to 4x4 you are engaging both the transfer case and the hubs?
Because it definitely feels like the transfer case is engaging.
Mine is a 99 F350 CC 7.3l PSD

Thanx in advance for any replies.

Dan
 
Reply
Old Dec 21, 2003 | 06:47 PM
  #8  
dheaton's Avatar
dheaton
New User
Joined: Oct 2003
Posts: 6
Likes: 0
this happened to me until i got tired of dealing w/ it. took of the battery cables and the reset gave me anohter 6 months before it would go out again. finally got a new module. Also had a vacuume leak at hub at 120,000 miles that was an inner hub seal but the dash lights would come an indicateing 4wd however the ac would shoot out the defrost vent instead of the dash vents the vacuum wouldn't hold the vent open.
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

 Verdad Gallardo
story-1

Top 10 Fords at 2026 Carlisle Ford Nationals

 Joe Kucinski
story-2

3 Best / 3 Worst Parts of Modern Ford Ownership

 Brett Foote
story-3

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

 Pouria Savadkouei
story-4

Every 2026 Ford Engine Explained

 Brett Foote
story-5

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-6

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-7

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-8

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-9

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote
Old Dec 21, 2003 | 07:52 PM
  #9  
r507's Avatar
r507
New User
25 Year Member
Joined: Jul 2000
Posts: 19
Likes: 0
come to think of it I have noticed this mysterious changing of where the heat is being blown from the upper or lower vents without me changing any vent settings though I don't remember if this was while i was in 4wd or not. I'll have to pay closer attention to when this happens.
 
Reply
Old Dec 22, 2003 | 04:31 PM
  #10  
r507's Avatar
r507
New User
25 Year Member
Joined: Jul 2000
Posts: 19
Likes: 0
Problem fixed, found left vacuum hose to front hub had a split in it. Cut it out and repaired section, operation now ok. Thanx for the info.

Dan
 
Reply




All times are GMT -5. The time now is 08:20 PM.

story-0
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.

By Verdad Gallardo | 2026-06-12 11:01:55


VIEW MORE
story-1
Top 10 Fords at 2026 Carlisle Ford Nationals

Slideshow: Top 10 Fords at 2026 Ford Nationals

By Joe Kucinski | 2026-06-09 11:10:08


VIEW MORE
story-2
3 Best / 3 Worst Parts of Modern Ford Ownership

Based on years of owning multiple modern Ford products.

By Brett Foote | 2026-06-09 10:53:36


VIEW MORE
story-3
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

SPONSORED: From muddy boots to rain-soaked cargo, these upgrades address some of the most common frustrations Ford truck owners face every day.

By Pouria Savadkouei | 2026-06-08 18:50:34


VIEW MORE
story-4
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-5
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-6
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-7
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-8
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-9
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE