tjkj2002 wrote:
Have you changed the plugs and wires? Diff fluids? Manual trans fluid? You will get worse mpg's in hot weather from running AC and also the intake air temps are increased,hot air is less dense then colder air.
Sure have, well most of that. Just finished changing out 5 speed fluid and will get diff cases again soon. As for tune up, I have all new plugs, wires, air cleaner etc etc.... As I mentioned before, then decided to come over here and get serious about finding an answer.... There are two temperature sensors on a Liberty, one is for outside temp vs air cond and the other I believe is air intake temperature. That second one might be my problem. Then there is the oxygen sensor, not sure if the Liberty turns on the red engine light when that goes bad or not. I should change it just to be sure.
Correct on the less dense air, but I got through all the mountain passes last summer going to Salt Lake City. I took the back roads not the Interstates and the little engine made it, with good use of the 5 speed of course.