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Will not engage 4WD

Tiny
SEPTEMBERC
  • MEMBER
  • 1 POST
  • 1998 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
The lights on the switch on the dash are showing 4AWD 4X4 and 4L.
When I move the switch I do hear a loud Clunk, however the axles are not engaging. I replaced both solenoids on the firewall.

A friend looked at it for me and I hope to repeat what he told me... He took the cover off the differential, manually pushed the fork and it engaged easily. He then checked the solenoids on the firewall and one of them (passenger side) wasn't working. (He used a vacuum hose to jump between the two and he said it worked) So I replaced that solenoid but it is STILL not engaging.

I do have vacuum at both of the solenoids

ANY HELP OR SUGGESTIONS will be greatly appreciated.
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Tuesday, February 12th, 2019 AT 6:40 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Have you replaced the vacuum hoses? If there is a leak, you may have vacuum but not enough.

Let me know.
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Tuesday, February 12th, 2019 AT 6:40 PM (Merged)
Tiny
TOOL4U916
  • MEMBER
  • 1 POST
  • 1998 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 85,000 MILES
The 4wd will not engage with the dashboard switch. The lights on the switch do not come on and there are no noises made. Seems to be stuck in 2wd. I have checked all the fuses and they are good. Anyone have any ideas??? Thanks in advance.


https://www.2carpros.com/forum/automotive_pictures/390714_DSCN0982_1.jpg

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Tuesday, February 12th, 2019 AT 6:40 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
What you need to do is check to see if the 4wd actuator on the transfer case is getting power when you switch to 4wd. If it is, chances are the actuator is bad. If no power is there, then we will need to check wiring to the switch and the switch itself.

Let me know what you find.

Joe
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Tuesday, February 12th, 2019 AT 6:40 PM (Merged)
Tiny
MKENNEY89
  • MEMBER
  • 1 POST
  • 1998 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
My 1998 Ford Expedition will shift into 4X4 high, but will not go into 4X4 Low. Any help in fixing this would be appreciated.
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Tuesday, February 12th, 2019 AT 6:40 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Chances are either you are not getting power to the actuator from the switch to shift into the 4lo or the actuator is bad. You need to check to see if the actuator is getting power when you push the button for 4lo.

Let me know what you find.

Joe
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Tuesday, February 12th, 2019 AT 6:40 PM (Merged)
Tiny
GYPSYMOURNIN
  • MEMBER
  • 1 POST
  • 1998 FORD EXPEDITION
I think the 4x4 module is bad in my truck. Sometimes it sticks in 4x4 and sometimes it won't go into 4x4. But mostly I think it is stuck in AWD. So where can I find the module to change it, and how much will it cost me?
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Tuesday, February 12th, 2019 AT 6:40 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Expensive guess. I would look at the motor on the case before the gem module.
The GEM controls the following features:

Wipers/washers (front/rear).
Warning chimes.
Battery saver.
Illuminated entry and courtesy lamps.
Driver power window.
Accessory delay.
4-wheel drive.
REMOVAL

Disconnect the battery ground cable.

CAUTION: Electronic modules are sensitive to electrical charges. If exposed to these charges, damage may result.

Remove the steering column opening cover.

Remove the (A) bulkhead electrical connectors from the (B) instrument panel fuse junction panel.

Remove the (A) instrument panel fuse junction panel bolts and remove the (B) interior fuse junction panel nuts.

Disconnect the (A) GEM electrical connectors from the (B) GEM.
It is pricy with the part, labor and programming.

Get a real opinion from a shop first.

Roy

Remove the screws and the GEM.
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Tuesday, February 12th, 2019 AT 6:40 PM (Merged)
Tiny
WOLFFEMAN
  • MEMBER
  • 2 POSTS
  • 1997 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 146,000 MILES
My vehicle does not engage the 4 wheel drive when AAWD is selected. No problem going into full four wheel drive.I would like to know where the control is for AAWD, on the tranny, near the rear axle, ? I have spoken with two different mechanics about this and they were both vague with their answers. Is it a big secret or are they unfamiliar with that type of drive? If it is electrical I can at least check the circuits and if it is replacable I can probably change it myself. Can you tell me where to find this control?
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Monday, November 16th, 2020 AT 6:58 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Actually, there are two speed sensors on the transfer case that determine if the rear wheels are turning faster than the front. It they do, the speed sensor sends a signal to the PCM whch engages the 4wd. I believe on your year vehicle there is one both in the front and rear of the transfer case.

Let me know if you can't find them.
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Monday, November 16th, 2020 AT 6:58 PM (Merged)

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