jaserlet
Member
I recently bought a 1999 Expedition XLT from its original owner. 150,000 miles in very nice cosmetic condition. Spark plugs were recently changed but everything else is original, including shocks and wheel bearings. When I did my test drive, 4H and 4L (it has the A4WD feature) seemed to work fine. However when I tried 4H again today I noticed some additional noise that worries me!
Going 40 mph down the highway, I turned the knob to 4H. The "4x4" light on the dash came on and almost immediately I could hear some additional road noise, mostly from the front, sounded sort of like I was going over rougher pavement. The noise was pretty consistent from 40 - 65 mph and was the loudest when I took my foot off the gas and coasted down between 55 and 50 mph. Again it sounded a lot like really tough pavement road noise. At 40 mph I turned the knob back to A4WD and the "4x4" light turned off but the noise continued. I had to pull over and come to a complete stop and then start driving again for the noise to go away. I was able to repeat this same situation again a few miles down the road.
Any ideas as to what might be causing this noise in 4WD? And why doesn't it go away when I put it back into A4WD? I didn't experience this with a 2005 F-150 XLT 4x4... though I realize isn't the same as my 1999 Expedition!
Going 40 mph down the highway, I turned the knob to 4H. The "4x4" light on the dash came on and almost immediately I could hear some additional road noise, mostly from the front, sounded sort of like I was going over rougher pavement. The noise was pretty consistent from 40 - 65 mph and was the loudest when I took my foot off the gas and coasted down between 55 and 50 mph. Again it sounded a lot like really tough pavement road noise. At 40 mph I turned the knob back to A4WD and the "4x4" light turned off but the noise continued. I had to pull over and come to a complete stop and then start driving again for the noise to go away. I was able to repeat this same situation again a few miles down the road.
Any ideas as to what might be causing this noise in 4WD? And why doesn't it go away when I put it back into A4WD? I didn't experience this with a 2005 F-150 XLT 4x4... though I realize isn't the same as my 1999 Expedition!
Last edited: