Victor Alejandro Posted March 10, 2019 Share Posted March 10, 2019 Hi everyone! I'm from Tamaulipas, México. I have a Jeep Comanche 1988 with 2.5, 4 cylinder motor. I drive to my work every monday 68km , but the gas consumption I think that is to high for a 4 cylinder motor, I spend 10 liters of gasoline. The highway were I drive is a big Montain. This is my first Jeep in my life and I love it, but I need and opinion of you guys, if this consumption is normal for this motor. Thanks, and I hope to get an answer. Regards. Link to comment Share on other sites More sharing options...
Eagle Posted March 11, 2019 Share Posted March 11, 2019 Bienvenido. 68 km is 42 miles, and 10 liters is 2.64 gallons. Your fuel consumption in the terms we use in the U.S. is 15.9 miles per gallon (MPG). That's pretty bad for a 2.5L. Even a 4.0L should deliver better fuel economy than that. However, you mentioned a big mountain. That doesn't help. Link to comment Share on other sites More sharing options...
gogmorgo Posted March 11, 2019 Share Posted March 11, 2019 Seems high to me too. I've only been driving my 2.5L MJ about a month, and I've only put gas in it three times. The second time I came up with about 11.7L/100, the third time with 13.5. Probably 10-15% around town and the rest at ~100km/h on the highway ln both fills but more time sitting idle on the second tank. I don't think it's enough data points to find a trend. I don't know what your roads are like, but here I usually don't have to slow down again once I get up to speed because there's not much traffic. Having to slow down and speed up over and over really cuts into fuel economy. But we also have some pretty good hills here: Link to comment Share on other sites More sharing options...
carnuck Posted March 11, 2019 Share Posted March 11, 2019 One of the first things I would do is ensure that the Orings on the injector aren’t leaking (assuming you have Renix TBI like most US models) That’s about the “economy “ I got with my ‘88 with 33” tires, 3.73 gears and a pallet of concrete bags or cinder blocks running 4.0L AW4 and over 250,000 miles on it. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Eagle Posted March 11, 2019 Share Posted March 11, 2019 9 hours ago, gogmorgo said: Seems high to me too. I've only been driving my 2.5L MJ about a month, and I've only put gas in it three times. The second time I came up with about 11.7L/100, the third time with 13.5. Probably 10-15% around town and the rest at ~100km/h on the highway ln both fills but more time sitting idle on the second tank. I don't think it's enough data points to find a trend. Converting Victor's numbers to the metric fuel consumption system, 10 liters for 68 km extrapolates to 14.7 liters per 100 km, which isn't too far behind the second of your two figures. I think that's rather poor fuel mileage for a 2.5L MJ, but at least Victor now knows that he is not the only person getting such numbers. Link to comment Share on other sites More sharing options...
gogmorgo Posted March 16, 2019 Share Posted March 16, 2019 Man, took some work to dig this thread back up. Less than a week and it's already three pages deep. I'm currently working towards addressing my own poor fuel economy, so I figured I'd sorta document what all I'm doing. The first thing I'm working on is replacing the fuel in the tank. Just letting it burn down, I mean. It was at 3/4 tank when I bought it, and I haven't let the gauge drop past half yet. The truck was sitting not running when I bought it, and I don't really know for how long. I don't think bad gas would have a huge effect, and I've put enough into it that it should have mixed in reasonably well and be mostly new, but I'll be running some fuel system cleaner through it with the next fill, which will be below 1/4-tank on the gauge, possibly to the low fuel light... assuming it works. More importantly, I'm trying to make sure it's running at operating temp. By my temperature gauge it isn't, it's not getting much past 150°F/~80°C on the gauge. But I've got a temp sender from a YJ in it right now, and I don't know for certain it's compatible with the XJ/MJ gauge. Different part numbers and whatnot. I struck out at the local parts store on getting a new sender so I may just rob one off something else in the yard. As for everything else that could be contributing to running cool, my thermostat is newly replaced and it's definitely working (heater hoses get too hot to touch comfortably before the upper rad hose noticeably gets warmer) but I'm not sure what temperature it's opening at, just what it's supposed to be running, which is much higher than what the temp gauge ever has seen. My fan clutch also seems functional. I may swap out my temperature sensor too for the heck of it, even though I don't have any codes for it. (Or for anything else). The reason for making sure it's up to operating temperature is that if it isn't, it will stay in open loop, meaning it's running rich for warmup, and the O2 sensor is out of the loop. Other things to check for will be vacuum leaks (especially to the MAP sensor) and fuel leaks. Link to comment Share on other sites More sharing options...
omega_rugal Posted March 17, 2019 Share Posted March 17, 2019 very bad gas mileage, get it serviced... Link to comment Share on other sites More sharing options...
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