I have a 1999 Explorer and at about 55K miles a humming sound started coming from around the air intake ducting in the right front of the car. I ignored it for a while, then the check engine light came on. I took it to the dealer, who said that codes were showing for running rich, so they tightened some hoses and made the check engine light go off and the noise was gone. A day later the noise came back and the check engine light was back on.
I took it to the dealer again, and they referred to a bulletin on the air intake gasket and did the repairs for free this time, due to an extension of warranty on this problem. Now, a few days later, the sound came back again. Now it?s intermittent, but it?s still there.
Anyone else have this problem? Any ideas that the dealership couldn?t come up with?
-Andy