- Location
- Virginia City, NV
So I have a puzzling situation involving fuel economy with my 1997 2door 4,0 AW4. It has a 3" lift and 31" all terrains. The axles are 4.10 geared. The motor has about 150k on it and the trans has about 240k. I got this jeep really cheap and it had issues. I did a simple rebuild and got it running again but had really bad milage. This was when it was still completely stock. So I replaced the CPS, MAP, both o2s, the cat, Pickup coil, and did the usual tuneup stuff. No change in economy. Also started to notice really low oil pressure so I went ahead and did a motor swap. All the sensors were swapped to the new motor as I had just replaced them all recently. The new motor has about 150k on it and ran superb in the previous vehicle. With the swap I put on an apn header and a 99' intake manifold and a Cowl intake System will some precision 4hole injectors and a bored throttle body. Also put on a Super40 Muffler with a turn down and switched to an electric triple fan setup for cooling. So with all those upgrades and a fresher motor that was proven I am getting about 10mpg. I've checked the TPS, MAP, CPS, and i have no codes on my scan tool. Filling up every 180 miles is really sucking especially with the price gas is now.
Just wondering if anyone would have a list to start checking even if its redundant to what
I have already done. It would be easier I think to have a list with links to diagnostic
procedures and such. Starting with the most important.
Most of the threads i read on fuel economy are just full of people saying what they have
and how great or horrible their Mileage is. This is not helpful in my case as I already
know I'm getting bad mileage. (sorry for the short rant. I'm done)
Also wondering if the trans could be robbing any power and thereby fuel economy. My 1-2
shift lasts about 2 full seconds even under full throttle and the rest are very sluggish.
I have adjusted the kick down cable several times and it is set properly.
I do not have a heavy foot as my 5" lifted four door with 35s and 410s accurately measured gets 17mpg regularly.
Just wondering if anyone would have a list to start checking even if its redundant to what
I have already done. It would be easier I think to have a list with links to diagnostic
procedures and such. Starting with the most important.
Most of the threads i read on fuel economy are just full of people saying what they have
and how great or horrible their Mileage is. This is not helpful in my case as I already
know I'm getting bad mileage. (sorry for the short rant. I'm done)
Also wondering if the trans could be robbing any power and thereby fuel economy. My 1-2
shift lasts about 2 full seconds even under full throttle and the rest are very sluggish.
I have adjusted the kick down cable several times and it is set properly.
I do not have a heavy foot as my 5" lifted four door with 35s and 410s accurately measured gets 17mpg regularly.