My Jeep seems to have two completely different personalities.

Sometimes I drive it, and it feels like it pulls strong, runs great. Then the next time I jump in it, I can barely muster 65mph on the highway without hitting the passing gear. And it's not one time of the day, or dependent on weather conditions. One trip, I am zipping down the highway at 75mph, then the next I'm smashing the pedal to get up to 65. Anyone else having this issue?

 

Happens to me too....was entering onto the interstate a couple of days ago and had to literally floor the gas pedal....thought the 18-wheeler behind me was going to have me for lunch. It's only happened a couple of times though. But hey, what's life without a little adventure!

 

Ya I agree, some days runs like a v8 and sometimes it runs with a little less pep., All in all, runs just fine for me.
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I thought it just me.sometimes its great other not so.as far as weather cold is good.hot bad 72-74 seems just right but not all the time.maybe it's the stall bug playing with other things?

 

mines a automatic , and sometimes when it shifts the rpms drop like its trying to get into a real high gear then once in that high gear all ok. i know when i first start up in mornings she seems a little sluggish

 

2nd feels sluggish at time to me. I am going to bring it up when I go for my first free oil change.

 

Thought it was just my imagination. It seems to happen very rarely, but it does happen. I also agree with tolh13, this may be stall bug related.

 

Do you have 6 speed or auto..........?

 

I guess I should have mentioned that in the first post. Auto with the latest transmission TSB completed, but no TC change. They blame the vibration at 40mph on my tire and wheel combo, even though I told them it did it before I put the new wheels on.

 

The wife and I just took a little road trip up to our favorite tattoo joint in NH, and got back yesterday night... I experienced this "split personality" thing during the road trip.

I drive an auto, and certain passing maneuvers made me feel like I had TONS of power to spare, whereas others had me feeling like the engine was wheezing like an old man... I'm pretty firmly convinced that it's the drive-by-wire interface, and here's my anecdote in support of that belief:

Cruising around 70 MPH or so, my RPMs are pinned around roughly 2K (give or take 3-400 depending on momentum, uphill/downhill, wind, etc)... Well, on a long straightaway on the ride home from NH, the scientist in me decided to "feel out" the throttle. I VERY SLOWLY and consistently increased the pressure on the gas pedal, while I was going about 70 MPH. RPMS slowly (and I mean SLOWWWWWLY) went up from around 1900 (at start of "experiment") to about 2200 as I increased the gas input... I pushed a TINY bit more, and nothing... then pushed a TINY bit more, and still nothing... keeping the pressure on the pedal steadily, consistently increasing, without any sort of jerky input (i.e. "gunning it"), I was seeing NO response on the tachometer - I was still around 2200 RPM. Then, all of a sudden, my TINY increase in gas pedal input caused the engine to race upwards of 3100 on the tachometer (CPU downshifted too, I believe) and the engine came to life and pulled hard.

I repeated this experiment, with the same results every time. When I really "get on it," there's PLENTY of power to be had, but there DOES seem to be a bit of a "dead zone" between "gunning it" and moderate throttle input, where the engine doesn't want to do anything until you MAKE IT do something. Sorry if this is incomprehensible - I tried to describe it well.

Bottom line: In town, if you're driving an Auto, turn off O/D if you want better power - big difference between 3rd gear's 1:1 ratio and O/D's .6?:1 ratio... On the highway, for me at least, you kind of have to force a downshift into 3rd to wake the engine up, and then, once it's "alive" and settles back into O/D on its own via the CPU, it'll keep on pulling strong... I don't know why this is the case, but now that I'm used to it, passing is a lot less of a gamble!

Anyone else found similar? :confused: