Question about Jeep Grand Cherokee
First problem is that in most locations, alcohol is added to the fuel you buy. It takes twice as much alcohol to produce the same amount of power made by an equal amount of gasoline. Your vehicle was designed before they did that. Next, the injectors on your engine are likely somewhat worn. Eventually the fuel going through them causes the orifice to enlarge slightly. Finally, the 02 sensors may be a bit out of range as well as the temp sender. Those items can cause the fuel mixture to be off slightly without triggering a failure code. Replacing those items is expensive...you'd need to save a lot of fuel to pay for the expense of replacement. If I was going to pick one item, I'd probably replace the 02 sensors. Some techs actually recommend them along with any major tune up. In addition to what I mentioned, a GC is a fairly heavy vehicle. The 4.0 is a good engine but in a GC it is worked a bit harder than if it was in a Wrangler or regular Cherokee.....not much you can do about that though.
Only other thing I can think of is to make sure you have a 195 degree thermostat installed. Any rated lower can reduce MPG. Aside from those "routine" things, you could install an aftermarket cam and exhaust system. In doing that you can tailor the engine parameters to better match how you drive.(also expensive though). I've got a bunch of Jeeps and none get spectacular mpg but they don't break down as often as other vehicles their age. I consider that in overall yearly cost and it's not really that bad.
Posted on May 23, 2011
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Posted on Jan 02, 2017
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