- Location
- Roanoke VA
After one full tank of fuel I'm getting 15mpg in town. My idle is still low but much smoother.
15 mpg in town may be OK? Depends on how much start and stop, and parking lot time you spend in traffic?
"My harness shows some melting on the plastic loom but I uncovered all of it and looked it over good and checked the continuity across the suspected area, all was good"
I am wondering if you overlooked something here. A wire test while the wire is still connected to a circuit or grounds may fool you! If insulation is a little fried the carbon formed can cross connect wires leading to weak extra ground path that may be difficult to detect. Or humid days can create a mild ground path.
Is the O2 sensor (new one) still reading 5 V at idle, reading rich?
Usually a rich running engine at idle would idle high, not low, and be caused by leaking injectors, but yours sounds like the ECU is reading lean at idle and starving it for air.
Just for grins run it cold and hot with out the O2 sensor connected, and lets see what the idle is then?
Fill it up with the O2 sensor connected and do a 50 mile non-stop high way round trip run back the same pump, refill and re-figure MPGS for highway.
Mike, there is no change in the idle with the O2 unplugged:huh:
Whats going on with this Jeep? Is there a break in the wiring to the ECU?
I was getting a neutral reading of 2.4 at idle after the install
So it sounds like the O2 sensor is working at idle now, and the ECU is getting proper data at idle and it is no longer running rich at idle?
So if you are at 15 mpg, plus 1-2 in comfort mode, you are already at 16 to 17 mpg, after the axle swap. Were you running 30s before?
Say hello to Uncle Bob for me!!!:wave:
LOL
I frequently forget to mention that people need to check for exhaust leaks, cracked exhaust pipes. The O2 sensor compares the exhaust gas O2 concentration to out door ambient air O2 concentrations, and if exhaust gas is blowing on the O2 sensor from a crack or gasket leak, it can throw off the measurements, and the computer will get miss led and waist fuel!!!!!!!!
Okay Mike, Uncle Bob(LOL!) came by today and adjusted that throttle stop, I then re-adjusted the TPS to a dead nuts 83%
I now have a solid 600rpm idle in drive, 700 in park, 500rpm with it in drive and the electrical system maxed out and AC on.
So what fixed it? And who is Uncle Bob?