IN A DASH FOR 1998 FORD EXPEDITION FUSE DIAGRAM
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I have a 1998 Ford Expedition xlt 4wd. It has a 5.4 engine
I have a 1998 Ford Expedition xlt 4wd. It has a 5.4 engine. When I use the 4wd shift knob the dash shows the respective - Answered by a verified Ford MechanicThanks Ok, 4 possible things can cause this. Bad vacuum motor Bad internal gear shift that cannot engage the front axle Bad/leaking vacuum lines between the vacuum motor and the vacuum solenoid Bad solenoid. The most common thing see is a vacuum leak between the solenoid and the motor. If you have a vacuum pump or grab a manifold vacuum source from the engine while idling, apply vacuum to the motor through the lines at the solenoid. Just follow the vacuum lines up to the solenoid. If you can apply vacuum at the solenoid and the vacuum motor moves, then the lines from the solenoid down are good and the motor and the shifter. Most likely a bad solenoid. Verify that there is battery voltage there at the solenoid before replacing. Let me know what you find. ThanksThanks for the great question. Can you tell if the front driveshaft from the transfer case to the front axle is moving and then stop moving when you go to 2wd? ThanksThanks When you engage the 4x4 high or low, the front shaft should turn when you move the vehicle. OR Grabbing the front shaft, with the truck stopped, you should not be able to move it by hand because it should be locked by the transfer case being in 4x4 mode. ThanksOk, thanks. Just come back to this same post for updates. ThanksOk, that tells me that the transfer case is engaging both drive shafts, that's good. Now just to make sure we are both on the same page, what makes you think that it is not in 4wd? A quick test would be to put it in 4x4 mode and then try to make a hard turn while moving and you should feel like the truck is binding up. This tells us that it is in 4x4. Can you try that and make sure it is now working or not. Let me know please. ThanksThanks Ok, now we will look at the front axle to see if it is engaging correctly. Look for a pair of vacuum lines that come down to a vacuum diaphragm located on the center area of the front axle. Make sure the lines are connected. Make sure the vacuum diaphragm and rod is engaged into the lever that goes inside the axle housing. let me know if you find anything wrong there. Thanks