4 wheel drive stuck in 4 lo

C.MORT

MEMBER
1998 FORD EXPEDITION
V8
4WD
AUTOMATIC
152,000 MILES

How do I get a 1998 eddie bauer expedition 5.4 liter out of 4 lo it is not changing back to 2 wheel when I change the selector switch and I have tried the break, neutral, switch trick and it did not work I also quit hearing the relays in the dash when I move the selector switch PLEASE HELP I need the truck for work in the morning

Tuesday, February 15th, 2011 AT 3:29 AM

1 Reply

BMRFIXIT

MECHANIC
19,053 POSTS

The Expedition is equipped with 2WD and 4WD vacuum solenoids attached to the upper RH side of the engine compartment dash panel, they alternately route vacuum to the vacuum motor which engages/disengages the center axle disconnect collar in the front axle assembly.

The 4x4 shift motor relay is a module containing two relays which, under the control of the GEM, shift the transfer case shift motor between the 2WD and the three 4WD modes.

The solid state clutch relay is used to activate the A4WD clutch within the transfer case.

Visual Inspection

Mechanical
Switch(es)
Vacuum leaks

Electrical
Fuse(s)
Damaged wiring harness
Loose or corroded connector(s)
Circuitry

let it sit overnight
start engine place shifter in N foot on the brakes
and move mode switch to 2WD
if that doesnt work you have to have it checked for codes

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Tuesday, February 15th, 2011 AT 4:02 AM