Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum > Loss of power up hill

Join Wrangler Forum Today

Thread: Loss of power up hill Reply to Thread
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
12-18-2008 05:04 PM
final update

Just an update in case this is ever found in a search. The catalytic converter was the issue and covered by a recall from the stealership. They did make me pay for the second O2 sensor.

Check for recalls here Jeep recalls

Thanks for the help all!
12-17-2008 09:22 PM
Jerry Bransford I'd take it up with Jp magazine editor John Cappa then, he's the one who tested the combination and wrote about the results.
12-17-2008 08:06 PM
Jma20a x2, ive been told it helps with power loss and possible slight better of gas millage
12-17-2008 07:10 PM
Triple88a i would be interested to see the dyno behind that statement.
12-17-2008 06:26 PM
Jerry Bransford
Originally Posted by Jma20a View Post
my loss was slow to grow to where it is now, was thinking that a 4.0L throttle body would help.
Jp magazine tested that combination and found it actually caused a minor loss of power.
12-17-2008 06:18 PM
chief100psu Sweet - searching through the post I found a link to the Jeep site that shows recalls - my jeep is eligible for a replacement cat!! I was rattling anyways - hope this is also why it is bogging down - This forum is great! I will let you know if it was the cause.
12-17-2008 04:40 PM
Jma20a my loss was slow to grow to where it is now, was thinking that a 4.0L throttle body would help.
12-17-2008 03:32 PM
Jonny15 So it just all of a sudden started doing this? I was gonna say i have a 2.5 manual and at times i need to go to second to make the damn thing go up really steep hills and even then it sounds like its breaking a pretty big sweat. Guess that's the fun of owning a 2.5 lol
12-17-2008 12:45 PM
Jma20a i've had the same issue with my 4 cylinder for a good deal of time. i replaced the o2 sensor and that seemed to do nothing, next i guess i will have my mechanic test the cat.
12-17-2008 12:40 PM
Jerry Bransford A bad cat (yours is rattling so it is bad) can reduce engine performance if it becomes plugged. And bad cats often do become plugged, I'd take it to a muffler shop (avoid the chain muffler shops like Midas that tend to rip people off) and have them do a pressure test to see if the cat is plugged and reducing your engine's power.
12-17-2008 08:58 AM
chief100psu Guess it is not the clutch then, doesn't slip just boggs down. I have a cat converter that is rattling (not sure inside or outside) I wonder if it affected the second O2 sensor? No CEL. Still don't know where to start - vacuum perhaps?
12-16-2008 10:24 PM
Originally Posted by chief100psu View Post
whats a clutch feel like when it is failing
you step on the gas, the rpms go up, the speed stays the same. It feels like the clutch is not fully engaged and its slipping.
12-16-2008 09:38 PM
jdhallissey engine swap would solve that! haha- I have the same problem i have to downshift one to two gears to make it up some hills with keeping speed.
12-16-2008 09:32 PM
Jerry Bransford Engine rpms climb up unexpectedly, especially when you're in the higher gears. Eventually there will be no mistaking a bad clutch when it starts slipping in 1st and 2nd gears too.

If it is bad, I'd go two Dial-A-Clutch - Your LuK Clutch Kit Specialist and get a replacement clutch kit made by Luk, avoiding the "Gold" version which is noisy when installed in a Wrangler. The entire kit consists of the clutch disk, pressure plate, throwout bearing, pilot bearing, and centering (pilot) shaft and sells for only $140 or so. I specifically would not go with a CenterForce clutch which is not designed for the types of uses typical to a Jeep.
12-16-2008 08:50 PM
chief100psu no check engine light - whats a clutch feel like when it is failing
12-16-2008 08:25 PM
Jerry Bransford Is there a check engine light? Since you can't generate your own diagnostic codes on a '98 like you can on most other model years, I'd take it to an auto parts store like Autozone to have them read any stored diagnostic codes. Since you did a tuneup only a few months ago, it's possible the upstream 02 sensor has gone bad which is making the air fuel mixture too rich. If the parts store can pull any diagnostic codes for you, it will at least head you in the right direction.
12-16-2008 07:56 PM
chief100psu Details - sorry

1998 - TJ - 2.5 - stock - manual - I think 4:10's whatever came stock

2 months ago - plugs/cap/rotor

Just noticed it today on the way home. It wasn't gradual - all of a sudden.
12-16-2008 07:26 PM
Jerry Bransford Details man, we need details. Jeep model year, engine type, transmission type, tire size, and axle ratio size. And when is the last time you did a tuneup?
12-16-2008 06:21 PM
Loss of power up hill

Coming home from work - going up a large hill - it started to bog down around 3500rpm. Clutch? Engine seems fine. No check engine lights - not sure where to start.

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -5. The time now is 07:46 AM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC