97 Green Machine
NAXJA Forum User
- Location
- Watertown, WI
I am completely baffled about this. The XJ is a 97 with a 4.0, AW4, 4X4, and about 105,000 miles. I put new plugs, wires, cap, rotor, air filter, thermostat, oil and filter, and did a coolant flush less than 1,000 miles ago. The upstream o2 sensor has about 5,000 miles on it. I've also ran a few different bottles of fuel injector cleaner through it in the past 1,000 miles. The tires are properly inflated and none of the brakes seem to be dragging when I jack either end up and spin the wheels by hand. The header had a leak in it, so I changed that with no improvement in gas mileage. It runs great. It idles slightly rough sometimes, but it doesn't lack power or misfire ever. I scanned for trouble codes and there are none. I usually accelerate just slightly faster than an old lady driving a Buick. I did a search and found a lot of posts like this on this and other message boards, but I haven't seen any posts where someone finds out what was causing their poor mileage. I don't expect my Jeep to get great gas mileage, but this is ridiculous. Any help or experiences on this subject would be GREATLY appreciated.