|10-25-2012 09:20 PM|
|Yellowdude||I don't know why it reads high. Person before me must of had 35s with the stock gearing lol. It's a dog with 31s. Everything is cool except for any slight incline.|
|10-23-2012 12:25 AM|
|10-22-2012 11:38 PM|
|Yellowdude||Thanks guys I will try these things. I have a feeling I'm gunna end up with gears or a different jeep 4.0...|
|10-22-2012 05:37 PM|
Here's a list. Go through and replace all of the parts:
-Crank Case breather (dealer part only)
-Remove your throttle body and scrub it clean
And because it's a good idea to do this every few years:
-Rear diff fluid
-Front diff fluid
-New 195* t-stat (test it with a boiling pot of water)
-New radiator cap
You should be good to go from there.
|10-22-2012 12:34 PM|
|95heepyj||If you have a yj with an original O2 sensor than yes you do need one. I have a 95 with a 2.5 and I only get 16mpg on average which is pretty lame for a little 4 cyl! You can always pull of a vacuum line and stick the hose in a can of seafoam, it will suck it up like a straw, and if there is any room for improvement in the induction, you will likely see it in your MPG. I got +2 mpg after I did that trick 3 times and it also woke up the engine some.|
|10-22-2012 11:55 AM|
|Yellowdude||The engine runs at 210. Could I still need a o2 sensor?|
|10-21-2012 03:11 PM|
|banks316||After your engine warms up to temp 210 degree the ECU goes in to a close loop mode. If it doent reach 200-210 it will not go in to close loop mode and will burn extra fuel in attpempt to get to operating temp. When its in the close loop mode it relies on signal from the O2 sensor and adjust fuel/air mixture. When an O2 sensor fails its default is to run the engine rich to avoid damage to the engine. Its better to run your engine rich then lean. I had my O2 sensor go out and i was getting 8mpg after I replaced it I was back up to 14mpg.|
|10-21-2012 12:00 PM|
|Yellowdude||I haven't done a o2 sensor. Just an oil change and an air filter. It doesn't seem to miss though, it has miss matched plug wires. Maybe I should try a cap rotor plugs and wires. How does the 02 sensor effect milage?|
|10-21-2012 03:47 AM|
To fix the spedo you need new spedo gear setup for your tire size and gear ratio. As for your fuel issue.
Have you done full tune up?
New O2 sensor?
What temp is your engine running?
Have you replaced your ECU temp sensor?
|10-21-2012 01:42 AM|
91 injected 2.5 only 12 mpg
I have a 91 yj 2.5 with 31" bfg all terrains and 4" lift. I only get about 12 mpg. And to boot my speedo reads 55 at 50. Soo it's prolly more like 11 mpg. I'm not sure why It could be so thirsty. That's around town and highway miles. What can I do to get better milage.? And what can I do to fix my speedo/odometer?