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(1999 Ford Expedition)
in Newark, NJ on March 16, 2017
Won't go into 4HI and in 4AWD when back tires spin ,the front tires do nothing.
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Popular Answer
on March 16, 2017
In *reality* - there is nothing for the DIYer to attempt on this one... Professional scan test needed to start diagnosis .. Vacuum pump/circuit tester required .. 'Smoke machine' is usually a huge time saver as well.
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on March 16, 2017
This needs to be scanned for codes. The absence of trouble codes will tell a story, but so will the presence of trouble codes.
Be sure that the parts store that checks it can scan ABS and Body codes as well. Post them here, thanks.
Now then, the transfer case might be having issues, the front differential as well, and these issues are likely electrical v. mechanical.
Let me know your questions ad trouble codes, and I'll get back with you ASAP.
If you prefer to have the vehicle diagnosed, you can view the list of certified shops in your area here:
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