please help me :-( - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 09-14-2010, 07:53 AM   #1
JimmyTJ's Avatar
Join Date: Aug 2010
Posts: 12
please help me :-(

Still having trouble with my 97 TJ and I fear I will never get to the bottom of it...

It has a slight jerk/ miss at idle and throughout the rev range which makes it annoying to drive, when I rev the engine and then come off the throttle I hear not quite a backfire but a slapback noise from the exhaust which sounds like it isn't happy, it idles fine then stumbles momentarily, as I rev I feel the miss is still present throughout the range (if that makes sense)

I must apologize for my description I am not all that mechanically minded

So far I have changed plugs (OEM) wires, distributor cap, rotor arm, replaced the manifold & both o2 sensors, cleaned the throttle body & IAC but the problem still persists and I am running out of cash/patience with it
and I don't know where to go next....if anything its a bit worse, there is no leaking exhaust noises or signs of a vacume leak, should I continue down the sensor route? TPS? its like the timing is out but I know its not adjustable.....arghhhhhh! please help me


JimmyTJ is offline   Quote Quick Reply
Old 09-14-2010, 07:58 AM   #2
meyers's Avatar
Join Date: Apr 2009
Location: Dover, New Hampshire
Posts: 738
6 or 4 cylinder?

meyers is offline   Quote Quick Reply
Old 09-14-2010, 08:01 AM   #3
Join Date: Sep 2010
Posts: 39
Images: 6
I had a 97 wrangler and your story sounds very much like what happened to mine.

During winter water separated from my fuel and got into part of the fuel injectors. When it got cold enough to freeze the water expanded and cracked the fuel injectors. Once that happened every time I gave it any throttle it sounded like you described.

You could check that.
flashgordon is offline   Quote Quick Reply
Old 09-14-2010, 09:05 AM   #4
JimmyTJ's Avatar
Join Date: Aug 2010
Posts: 12
Thanks guys, Its a 6

JimmyTJ is offline   Quote Quick Reply
Old 09-14-2010, 10:04 AM   #5
Join Date: Sep 2010
Posts: 315
Images: 3
I have been reading that '97 & '98 4.0L were given a "Bad" batch of valve springs. Some people I have spoken to said that after a valve spring replacment all was OK. Might want to read up on this as it may be your problem. Are you getting a #43 code thrown ?
XtrmTJ is offline   Quote Quick Reply
Old 09-14-2010, 10:45 AM   #6
kellyjo29's Avatar
Join Date: Aug 2009
Location: In the 'thumb' of Michigan.
Posts: 54
My 98 Jeep was doing this thing I called a 'hiccough', so I feel your pain with trying to describe the symptoms! As it turns out, it was the TPS and she has been running like a top and getting some decent gas mileage to boot! Good luck-
kellyjo29 is offline   Quote Quick Reply
Old 09-14-2010, 10:58 AM   #7
JimmyTJ's Avatar
Join Date: Aug 2010
Posts: 12
Thanks again for your responses, the only code i have had was the o2 sensor which I have now replaced


JimmyTJ is offline   Quote Quick Reply

Quick Reply

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.

Thread Tools

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 05:45 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