Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum > stumbling under load?

Join Wrangler Forum Today

Thread: stumbling under load? 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)
01-18-2006 09:04 PM
Originally Posted by 91taurisho
Could the reset procedure you linked to, really do much more than just resetting the pcm like I did?
i don't know, but i don't think it would hurt to try.
01-18-2006 05:32 PM
91taurisho It's a 5-speed and I reset the computer by disconnecting the battery, for about 20 minutes. When I did this all my codes went away. but the stumbling did not go away. Could the reset procedure you linked to, really do much more than just resetting the pcm like I did?
01-18-2006 05:13 PM
khenderson i would start with flashing the ecu. with all the changes to the exhaust/sensors and such, your comp might not know what to do with all the correct stuff. ECU reset
01-18-2006 05:11 PM
04moneypit Is it a manual or an auto? The computer input from an electronically controlled auto can cause problems by the way the computer regulates the shift points after sensing the wrong inputs or having a bad sensor or vacuum modulator. You could also try checking all your hard grounds for your electronics. Hope this helps.
01-18-2006 03:51 PM
stumbling under load?

Hi, I'm new here. My name is Scott and I drive a 1997 4.0 Wrangler Sport with 136,000 miles. Lately I've been having this problem that is completely random. Just for a little background info: My header cracked and my pre-cat O2 sensor was bad. I replaced the header and the O2 sensor but not before the header cracked all the way off and dropped my exhaust into the front drive shaft, which left a hole in the exhaust. I had just bought the car not but a month before. I replaced the exhaust and now it starts to stumble under load. It is bucking and misfiring but only when it is in gear and I'm giving it gas. If I coast in gear it doesn't do it and if I just free rev the motor it doesn't do it either. It started doing it right before I fixed the hole in my exhaust and replaced the O2 sensor but after I replaced the header. At first I thought it was a burnt/warped valve but it comes and goes. It only seems to be doing it when the car is warm and it's just to intermittent and random to be a valve. Then I watched my tach move around while it's missing so I thought the coil might be bad. So in went a new coil, new rotor and cap, and new plugs and wires. And it's still doing it. The exhaust is in fine shape now, the CEL is off and the only codes present are 12 and 55(12-battery has been disconected recently and 55-end of codes). It is completely random. It will stumble for a minute and then stop for 3 minutes, then stumble 2 or 3 times then stop for about 5 minutes. Any ideas or suggestions are greatly appreciated!

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 04:17 PM.

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