Whereas SUVs get a nasty rap within the press lately about being not very gasoline environment friendly, the Jeep Cherokee XJ is able to getting fairly good gasoline economic system. It could not match a Prius or a Civic however I might not attempt to take one among them off highway both.
Step one in bettering the gasoline economic system of the jeep is to verify it’s working appropriately. Make sure that all connections to the ECU are clear and correctly linked. Additionally examine all the bottom wires.
There are not less than three completely different computer systems used within the XJ sequence of Jeep Cherokees. The Jeeps made by AMC used the Renix pc system. This method makes use of just a few extra inputs than the later Mopar system and in some methods is extra advanced. The Renix system makes use of a knock sensor and is there earlier than able to tuning the spark advance curve to an optimum combine. Some Renix managed engines just like the one in my son's XJ Wagoneeer will truly get higher gasoline economic system utilizing increased octane gasoline. The gasoline economic system enhance is sufficient to greater than offset the additional value of the upper octane gasoline. You’ll have to experiment with your personal engine to see if increased octane gasoline will give higher gasoline economic system and better MPG. For many engines, the 87 octane gasoline will give the perfect gasoline economic system.
Additionally, word that there’s a large distinction in gasoline qualities from varied distributors. Ethanol content material lowers MPG in addition to many different components. Once more you’ll have to experiment with gasoline kind varied distributors in your space to see which one provides the perfect gasoline for the very best MPG. In my space it’s the Shell station that provides the perfect gasoline economic system when evaluating gasoline value to MPG.
The ignition timing of the XJ Cherokee is just not adjustable. The ECU controls these capabilities on a set desk and suggestions from the knock sensor if outfitted. Nonetheless it’s doable to trick the ECU into advancing the timing by adjusting the mounting factors of the Crank Shaft Place sensor. By merely sloting the holes, the sensor might be repositioned to regulate the precise ignition timing. Because of the excessive problem of accessing he mounting bolts of the CPS and the minor enchancment in gasoline economic system, this modification made not be well worth the effort. Adjustable CPS sensors can be found from some Jeep accent distributors.
One of many largest elements that results the MPG of a Jeep Cherokee is it transmission. Whereas the Asin 4 velocity automated may be very sturdy and includes a lock up torque converter, it merely cannot match the gasoline economic system of the 5 velocity handbook transmission. In case you are selecting a Jeep for gasoline economic system, select one with a 5 velocity handbook transmission.
Additionally, word that you probably have a 242 switch case additionally know as selec trac, you have got the choice of full time 4 wheel drive. Don’t use it with out the highway is slippery. You’re going to get the perfect MPG by utilizing two wheel drive.
Whereas a disconnect entrance axle was supplied on some Cherokees, on many XJs the entrance drive shaft is all the time coupled to the drive axle. On the non disconnect axle automobiles, you’ll be able to enhance the gasoline economic system by eradicating the entrance drive shaft. Simply do not forget that you’ll have to put it again earlier than you should use 4 wheel drive.
Tires make a giant impact on MPG. Whereas becoming a Jeep with bigger tires is widespread, there generally is a large unfavorable impact on gasoline economic system. Bigger tires are often wider and have a extra aggressive tread sample than the smaller road tires that initially got here on the XJ. Utilizing a set of slender, low rolling resistance tires might help MPG in road driving. On one Jeep Cherokee I personal there was a noticeable enhance in gasoline economic system after I briefly fitted a set of OEM sized tires. For greatest gasoline economic system, chances are you’ll want to contemplate having a set of road tires and set of off highway tires.
It doesn’t matter what tires you run, you will have to pay shut consideration the tire stress. Usually talking, the upper the tire stress, the higher the gasoline economic system. You’ll have to modify the air stress in your Jeep by balancing the elements of tire put on, experience consolation and Traction. At all times hold your tires correctly inflated and air again up earlier than driving on pavement after your off highway adventures.
One other large issue for MPG is wind drag. Even the manufacturing facility roof rack makes a noticeable distinction in gasoline economic system. To maximise gasoline economic system, take away and roof racks or different roof mounted equipment.
When lifting a Cherokee, it is not uncommon to take away the manufacturing facility air dam. Nonetheless, this little piece of rubber does enhance gasoline economic system. Maintain it in place and straight for greatest MPG. Additionally the rubber mat beneath the engine helps to enhance air circulation beneath the XJ for a slight enchancment in gasoline economic system.
One other widespread modification that reduces gasoline economic system is armor and safety equipment. Your bumper guards and skid plates and rock trails add weight and in some circumstances disturb the air circulation. Contemplate the results on gasoline economic system when making these modifications.
Correct wheel alignment will enhance MPG as nicely. The entrance tires must be pointed as near straight forward as doable. Set the toe in as near zero as doable. The inverted Y steering association of the XJ causes the toe to vary with experience peak so to maximise the gasoline economic system, set the toe with the Jeep loaded as you usually drive it.
Probably the biggest single issue effecting gasoline economic system is your driving model. To maximise MPG, begin off slowly and keep a gradual velocity. Keep away from pointless stops. Maintain shifting as a lot as doable even at a really sluggish velocity in cease and go visitors. Attempt to anticipate hills and speed up earlier than gong up the hill. Allow you to velocity drop naturally hill climbing the hill. Keep away from lengthy idle instances particularly with the AC on.
One questionable space of rising gasoline economic system that I’ve had blended outcomes with is gasoline components. Many individuals have reported that including a small quantity of acetone to the gasoline will enhance the MPG. I’ve not seen any measurable enhance from including acetone. Nonetheless, occasional use appears to forestall stumble and misfires so plainly it could enhance MPG. Attempt it by including one ounce of pure acetone for every ten gallons of gasoline.
One other additive that appears to assist treatment gasoline provide issues is Seafoam. Seafoam smells like an alcohol mix and possibly helps principally to take away moisture from the gasoline system. Nonetheless, I’ve discovered a wide range of gasoline associated points kind clogged or sticking injectors to carbon fouling of the combustion chambers appears to be helped by including a can of Seafoam to the gasoline tank.
Oil selection and oil components will also be used to extend MPG. Nonetheless the long run results on the engine must be thought-about when selecting oil. Utilizing decrease viscosity oil might help enhance MPG. Nonetheless older engines might not lubricate nicely on low viscosity oils. An additive like Friction Free 3000 has been proven to extend MPG by decreasing inner friction within the engine. Give it a strive in you engine to see the way it works for you.
At all times use top quality oil in your Jeep Engine. The design of the four.zero block causes some components of the block to be highly regarded and can trigger wax or paraffin primarily based oils to separate. Wax primarily based oils will must be modified extra incessantly as a consequence of thermal breakdown.
Protecting your Jeep nicely lubricated in different areas will even assist increase MPG. Test differential fluids, switch case fluid and the transmission fluid regularly to take care of correct lubrication and cut back drag. Locker and restricted slip differentials might must be examine extra incessantly tan the manufacturing facility really useful intervals. Additionally, if there’s any probability that water has entered these components as a consequence of off highway adventures, change the fluid because the water and grease combination has poor lubricating high quality.
By way of correct upkeep and a being conscious of the results of widespread modifications, you’ll be able to keep affordable gasoline economic system in your Jeep SUV. Greater gasoline costs wouldn’t have to imply the top of your 4 wheel enjoyable. It could even make some configurations like a second set of tires extra economically viable. So take note of particulars and revel in driving your Jeep Cherokee.