Feels like im in "Limp" mode.....

[IamJEEP]

Matt, the shifting issue is not in OD, its in cruise control.

[Sal-XK]

I think Matt meant was are talking about the trans going in and out of OD while the cruise on. You might have just got some bad gas maybe that would cause sudden sluggish performance.

[IamJEEP]

It would downshift and a couple of seconds later downshift again for higher revs. Once it got to the set speed it would upshift back into OD. It is doing it way too often like the shift curve is off or something.

I did have a hell of a time on the highway of Western NC and NW Georgia. I think on one uphill it was pulling 6g at 45mph and was strugling at that. I believe we were around 3500ish feet above sea level there vs 0 here.

I hope it is bad gas. I guess i will have to wait till the next fill up.

[NeilSmith]

The hilly, mountain terrain up here is a lot different from what you see down there in Fla. I run cruise on the interstate and it is normally fine, when it gets to a hill it downshifts but yet it keeps its speed. When Im on a road like Rt 29 which is a 4 lane highway but yet it is nothing but hills, one after the other, I dont run cruise because it is constantly downshifting , sometimes all the way to 3rd. If youre not use to running cruise in the hills then you may think there is a problem. How was the gas mileags during your trip ? One year on the way back from the Outer Banks I had to stop to gas up. I should be able to make that trip easily on a tank of gas. I think I just got some bad gas. The jeep had a hard time keeping up to speed and felt sluggish. The temp outside was 107 degrees too so I dont know if that was a factor also.

[Matt]

I was going to say you could check the trans fluid.... but you don't have a dipstick...

The computer does a pretty good job of adjusting for altitude so that shouldn't be an issue. Do you have a scanner you can hook up to read some data? Would be a good idea to check things like the coolant temp sensor, air intake temp sensor, manifold pressure and 02 sensor readings to see if something is off.

[Sal-XK]

I'd run threw that tank and see what happens maybe just for ****s and giggles reset the computer and see what happens.

[IamJEEP]

I'd run threw that tank and see what happens maybe just for ****s and giggles reset the computer and see what happens.

I was thinking of reseting the comp,..... how long do i wait before reconnecting the battery?

[chevelleman4292]

matt is right (mopar) champion copper plugs ONLY every 30k miles.i have worked on dozens of newer jeeps and there really picky when it comes to plugs weather there worn out or a diffrent brand (like bosch platinum 2's they really don't like those),and atf+4 in the trans every 30k miles also.engine oil brand shouldn't matter as long as your using the right viscosity changing when you should and not using wallmart supertech oil lol. clean the throttle body also, old rag/tooth brush and small amount of carb cleaner it WILL make a diffrence.i have done all that and with 265/70/17's and a 3.7 still get 21mpg highway, 15 to 17 city.

[IamJEEP]

I was going to say you could check the trans fluid.... but you don't have a dipstick...

The computer does a pretty good job of adjusting for altitude so that shouldn't be an issue. Do you have a scanner you can hook up to read some data? Would be a good idea to check things like the coolant temp sensor, air intake temp sensor, manifold pressure and 02 sensor readings to see if something is off.

No i dont, but know someone who does. I need to change the trans fluid anyways because i overheated it a couple of times at Uhwarrie.

[Sal-XK]

12MPG highway with a 3.7L sounds really wrong bro and with the tires not being corrected it's really around 13MPG which is still bad. Something is wrong and you need to start considering your maintenance. How long since the diff, TC and Trans had been serviced. How about plugs filters wires oil and things like that.