One problem related to gas recirculation valve (egr valve) has been reported for the 1999 Jeep Grand Cherokee. The most recently reported issues are listed below.
My 1999 Jeep Grand Cherokee limited with 4. 7 liter v8 has a nasty white foam where I fill the oil. Looks like some kind of emulsification. Maybe water in my oil. I changed the oil this weekend when it was 2 degrees out and the white foam was frozen in chunks which then fell down the tube. Is there a TSB for this problem. I have heard similar problems from others with the 4. 7 liter. How can I get this problem corrected by Jeep?.