slamgranderson
New Member
Hello,
This is my first time posting here. I have an 04 liberty with 110k miles, and a few months ago I started getting really bad gas milage accompanied by an engine light. The engine light goes on and off. Usually it will come on for about 300 miles, then go off for 50-100, then come back on again. But these days it's on more than it's off.
I am getting only 17 or 16 mpgs on the highway, and my engine light coded for a P0302 or Cylinder 2 misfire. I took it to a shop and they told me it was a bad fuel injector. Regrettably I was in CO at the time and had no tools so I paid them almost $300 to replace it. Then a few weeks later, the engine light goes back on with the same code. So then I replaced the Cyl 2 spark plug. The plug seemed kinda fouled, with a chipped electrode. But the new plug didn't resolve the engine light. Then I swapped the coil packs on the 1st and 2nd cylinder. When I did this, it threw a different code: P2098 - Post Catalyst Fuel Trim System Too Lean Bank 2. I researched this code on this forum and it seems like it can mean a lot of different things.
Most recently, the engine light went off, then when it came back on it was back to P0302 or cyl 2 misfire. So the new spark plugs didn't solve the issue, and neither did swapping the coil packs, because cyl 1 didnt misfire when using the pack that used to be on cyl 2.
A few other things: it does not run rough, or idle badly. The engine seems to run good except for the poor mileage. I did notice that it accelerates poorly if you're going faster than 60mph, especially on an uphill. It seems to have very little power on the uphills. But I'm new to the libby, so maybe this is just how she runs. Also, I have been doing a lot of highway driving cross-country with this thing. Bought it this past January and already put 16k miles on. Finally, when I was living in CO for 3 months, I was using regular gas which is 85 there. All the locals claim its fine, because of the high altitude. But I'm still suspicious that using 85 octane gas for 3 months might have contributed to the problem. But I'm no expert.
I'm wondering if the next step might be to replace the 02 sensors, or maybe just bring it to a trusted mechanic. Any help would be extremely appreciated.
thanks a lot!!
This is my first time posting here. I have an 04 liberty with 110k miles, and a few months ago I started getting really bad gas milage accompanied by an engine light. The engine light goes on and off. Usually it will come on for about 300 miles, then go off for 50-100, then come back on again. But these days it's on more than it's off.
I am getting only 17 or 16 mpgs on the highway, and my engine light coded for a P0302 or Cylinder 2 misfire. I took it to a shop and they told me it was a bad fuel injector. Regrettably I was in CO at the time and had no tools so I paid them almost $300 to replace it. Then a few weeks later, the engine light goes back on with the same code. So then I replaced the Cyl 2 spark plug. The plug seemed kinda fouled, with a chipped electrode. But the new plug didn't resolve the engine light. Then I swapped the coil packs on the 1st and 2nd cylinder. When I did this, it threw a different code: P2098 - Post Catalyst Fuel Trim System Too Lean Bank 2. I researched this code on this forum and it seems like it can mean a lot of different things.
Most recently, the engine light went off, then when it came back on it was back to P0302 or cyl 2 misfire. So the new spark plugs didn't solve the issue, and neither did swapping the coil packs, because cyl 1 didnt misfire when using the pack that used to be on cyl 2.
A few other things: it does not run rough, or idle badly. The engine seems to run good except for the poor mileage. I did notice that it accelerates poorly if you're going faster than 60mph, especially on an uphill. It seems to have very little power on the uphills. But I'm new to the libby, so maybe this is just how she runs. Also, I have been doing a lot of highway driving cross-country with this thing. Bought it this past January and already put 16k miles on. Finally, when I was living in CO for 3 months, I was using regular gas which is 85 there. All the locals claim its fine, because of the high altitude. But I'm still suspicious that using 85 octane gas for 3 months might have contributed to the problem. But I'm no expert.
I'm wondering if the next step might be to replace the 02 sensors, or maybe just bring it to a trusted mechanic. Any help would be extremely appreciated.
thanks a lot!!
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