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

[IamJEEP]

A couple of issies i have noticed lately have me thinking. First is the feel of lack of power. Seems like i have to almost mash the skinny pedal jist to get the fat box up to speed. I never had to do that before and i thought it had something to do with the spare being on for a couple of weeks. Now i have a new tire and it has not changed. I dont have any dummy lights or codes popping up so im lost. Looking for possibilities here.

Second, the cruise control seems to be "hunting" to keep up the preset speed. I know its supposd to do that when going up or down a mountain/hill, but on a flat road and minor overpasses? C'mon now, my Jetta hardly/never changed gears when on cruise. Can it have someyhing to do with the larger wheels? If so, what would be the fix, tranny flash?

[07JeepXK]

My XK felt a little sluggish today for some reason. Not exactly sure why.

[Sal-XK]

It's hard to diagnose something that isn't broken. All kinds of stuff can cause sluggish performance bro. You put tons of miles on those tires you should be use to the change by now.

[Matt]

yeah if you just put the tires on, that's one thing..... but for it to all the sudden feel sluggish out of nowhere is kind of odd.

Did the shifting in OD just start too? If not, stop trying to compare it to your Jetta. Our commanders are the aerodynamic equivalent of a piano... the slightest change in head wind will cause it to down shift on the highway, especially the 3.7L which is already at its limit of the size of vehicle it should be pushing (let alone a lifted one with larger tires).

[IamJEEP]

Thats what is odd. It drove fine throughout my trip (except) the cruise control thing. But here at home, it just doesnt feel right. I know its a brick box and the weight of the wheels/tires doesnt help, but something is not right. Do you think that the altitude change of the trip confused (for lack of a better word) the computer? Therefor not feeding the right amount of fuel to air mix or something.....? Pulling at straws here.

[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.

[cico7]

Champion spark plugs and Jeep have a long history together. Both were manufactured in Toledo.
I say Champs.

Your rack on top can reduce your MPG. Have you tested it straight hiway driving?

Tire sizes also affect your MPG.

Caleb, did you see my story about when my cruise stopped working?

[superacerc]

I replaced my plugs last year and it made quite a difference. They were worn pretty bad and the tips were dissapearing. It made a huge power/throttle response/acceleration difference with the new plugs in it. I don't remember which plugs i got. I think they were bosch plats. They seem to work fine. I also like the copper plugs. They are usually the best performing plugs all around. In some cases however (my VW GLI) it will chew through the coppers in about 3500 miles. I have to go with irids which is what the car comes with.

[IamJEEP]

Champion spark plugs and Jeep have a long history together. Both were manufactured in Toledo.
I say Champs.

Your rack on top can reduce your MPG. Have you tested it straight hiway driving?

Tire sizes also affect your MPG.

Caleb, did you see my story about when my cruise stopped working?

The rack and tires did drop my mpg, but I started with only 14.5 or so.

I missed your cruise control issue.....gotta link?