I believe you are looking for a vacuum lean with this problem. Yes, there are actuators behind the dash that are actuated by vacuum. If the vacuum is weak or not working, it will stick in def and not change. Check under the dash for leaks. With the engine running, listen for a hissing. If you are lucky, you may hear a hissing.
Let me know what you find.
Saturday, August 28th, 2010 AT 10:26 PM