4x4 Light Flashing
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New User
Joined: Jul 2008
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It's a 99 Expy 4.6L and I just got it a few months ago for $1,200. The 4x4 switch works and it does engage the 4 wheel drive. I have no idea when the tranfer case fluid might have been changed if ever.
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Joined: Jun 2003
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From: Las Vegas
Well, you have a couple of options here. One, I would go down to Autozone or somewhere, and have them pull the codes. Two take it to Ford...Three, when you pull the codes, come back here, post them and I bet someone here can decipher what the codes equate to...
Also, are all four tires the same size and display similar tire wear?
Good luck
Also, are all four tires the same size and display similar tire wear?
Good luck
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Checked the tires all 4 are identical, Autozone found only 1 code and that was PO401 - EGR System I found the vac lines dry rotted and replaced everything is fine there now. It would act funny between 55-65 mph after it warmed up but since the vac line repair it drives like a champ. The 4x4 engages fine in 4H and 4L. Maybe I just need to drain the fluid in the transfer case and refill it. Any other suggestions?
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Senior User
Joined: Jun 2003
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From: Las Vegas
Thats good to hear it was an easy fix. I would check and replace all fluids with OEM, or higher quality fluids.
Good luck
Good luck
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From: Omaha, Nebraska USA
It could also be a speed sensor for the automatic 4 x 4. There are sensors that look for a difference in the speed of the front wheels compared to the rear wheels. I have not had this problem but have read on here about it and replacing those speed sensors has helped. I don't know if the smaller readers will go that deep on some of that stuff. Just thought I would mention it.
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