98 Expedition 4x4 problems
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98 Expedition 4x4 problems
I have a 98 4x4 Expedition with 4X4 issues. The shift motor will switch positions, but the front end will not engage. The front axle actuator will engage the front end if I bypass the vacuum shift solenoids and manually activate them.
If I have read correctly, the power to the solenoids if hot all the time and the GEM drops the negative ground to control the shift. I think that is right. Anyway, Both solenoids have power all the time no matter where I switch the 4-wheel drive selector. I am trying to determine my next course of action. I want to fix it but not just throw parts at it till it works.
The problem seems to be either the solenoids are bad or they are not receiving the proper electrical signal to tell them what to do. The AWD light has always flashed as long as I have had which has been a very long time. I Just would like the four wheel high and low to work. Any ideas would be greatly appreciated.
If I have read correctly, the power to the solenoids if hot all the time and the GEM drops the negative ground to control the shift. I think that is right. Anyway, Both solenoids have power all the time no matter where I switch the 4-wheel drive selector. I am trying to determine my next course of action. I want to fix it but not just throw parts at it till it works.
The problem seems to be either the solenoids are bad or they are not receiving the proper electrical signal to tell them what to do. The AWD light has always flashed as long as I have had which has been a very long time. I Just would like the four wheel high and low to work. Any ideas would be greatly appreciated.
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Joined: Jan 2001
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From: Central NYS
(And it sounds like they are working fine as you indicated that the Transfer Case Shift Motor changes positions.)
BUT the Front Axle Connect/Disconnect Vacuum Solenoids are hot only with the key in the "RUN" position.
Maybe you have a vacuum supply issue to the solenoids or the actuator?
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I bypassed the vacuum. I finally pulled the solenoids and the bottoms were swollen. Evidently the 7 degree temps and frozen precip we had several weeks ago took its toll on both of them. The four wheel drive did work then. I've ordered a pair, so please stay tuned, I'll keep you posted.
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