New Jeep Owner..Need Help - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-24-2010, 10:24 AM   #1
Newb
 
Join Date: Aug 2010
Posts: 4
New Jeep Owner..Need Help

So i bought a 98 with 80k miles to have as my fun car. When I bought the vehicle the used car dealership gave me all the paperwork, they had replaced the alternator, battery, and has did a completed injector cleaning ( sounds like the remove the fuel line hook it up to some machine and let it run off that for 15 minutes to clean the injectors and cleaned the throttle body. So after having this jeep for about a month I was having problems. When I started the jeep occasionally the rpm would just rev on its own to about 1500 then back down as if someone had their foot on the accelerator. When I start driving it acts as if something is clogged it backfires and pop so I then slam my foot to the floor and it breaks free. I took it up to my local jeep dealership they put it on the lift and said here is your problem the c. converter and muffler were rusted beyond belief. So they replaced both. While it was in the shop they suggested that I change the wires and distribution cap since they looked pretty bad and had a lot of carbon despostis on them as well, so after all that and new spark plugs I still am having this problem. I am out of town on business so I told the dealership to have it for a week since the problem doesn't happen every time I start it and drive just every once and awhile. I called today and they said they reset all codes but once they drive it and the problem happens it goes away pretty quickly which doesn't give them a change to hook it up to their machines to see what is going wrong. I don't want to tell them how to do their job but I also want my jeep to run right and hopefully steer them in the right direction. Anything I can tell them to look for that they might be overlooking? Thank you in advance for all your help. -Joey

tcu02xp is offline   Quote Quick Reply
Old 08-24-2010, 12:10 PM   #2
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 30,852
Images: 2
I dunno but that could be a bad (intermittent) crankshaft position sensor or a bad upstream (mounted just below the exhaust header) 02 sensor. The CPS is what provides the engine's master timing signal and the 02 sensor is what the computer uses to set the air-fuel mixture with.

Good luck with that problem and welcome to WF!

__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 08-24-2010, 12:19 PM   #3
Sponsoring Vendor
 
Ibuildembig's Avatar
 
Join Date: Aug 2010
Location: Fruitland, Missouri
Posts: 8,322
I'm thinking Throttle Position sensor or Idle Air control sensor
Ibuildembig is offline   Quote Quick Reply
Old 08-24-2010, 12:33 PM   #4
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 30,852
Images: 2
Quote:
Originally Posted by Ibuildembig View Post
I'm thinking Throttle Position sensor or Idle Air control sensor
It could be either of those too, they can cause problems like that when they get dirty. The IAC can be cleaned using throttle body or carb cleaner restoring it back to full operation. The TPS however cannot be cleaned so when it goes bad, it has to be replaced.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 08-24-2010, 12:36 PM   #5
Sponsoring Vendor
 
Ibuildembig's Avatar
 
Join Date: Aug 2010
Location: Fruitland, Missouri
Posts: 8,322
They might not be totally bad, just intermittant. That situation would be hard to find and might not cause a code. Problem these days are the mechanics are dependant on their computer to tell um which part to hang instead of really learning how to be a tech.
Ibuildembig is offline   Quote Quick Reply
Old 08-24-2010, 02:24 PM   #6
Newb
 
Join Date: Aug 2010
Posts: 4
I will defintely mention this to the mechanic, just a ball park what do each of these things cost? I am hoping not too expensive since I just spend a couple of hundred on the c. converter and muffler. Thanks for all the help so far!
tcu02xp is offline   Quote Quick Reply
Old 08-24-2010, 02:40 PM   #7
Sponsoring Vendor
 
Ibuildembig's Avatar
 
Join Date: Aug 2010
Location: Fruitland, Missouri
Posts: 8,322
Goto oreillyautoparts.com and type in your rig and it will show you what they cost
Ibuildembig is offline   Quote Quick Reply
Old 08-24-2010, 02:49 PM   #8
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 30,852
Images: 2
The IAC can easily be cleaned using an aerosol can of carburetor or throttle body cleaner which restores it back to normal operation. The IAC is only held onto the throttle body with two small torx screws (T-25 IIRC) so it can be easily removed, cleaned (clean the hole in the throttle body that the IAC plunger fits into too) which will restore it back to normal operation.

No guarantee a dirty IAC is the cause of your problem but for the cost of the can of throttle body cleaner and 30 minutes to do the job, it's worth a shot.
Attached Images
 
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 08-24-2010, 07:06 PM   #9
Newb
 
Join Date: Aug 2010
Posts: 4
You guys are a wealth of knowledge. Thanks for taking the time to respond to my post. I'm glad I joined this site!

tcu02xp is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Finally a JEEP Owner! 2010 Islander coachpete JK General Discussion Forum 26 05-22-2011 08:38 AM
New Jeep Owner 1989 YJ from Boise Idaho tazzilla WF New Member Check In 11 10-04-2010 06:00 AM
Former Jeep Owner with Strange Request RoBear WF New Member Check In 13 04-30-2010 06:07 PM
New Jeep Owner...Little help? ashworth1025 TJ General Discussion Forum 11 04-05-2010 01:03 PM
New Jeep owner....a few questions ky-homelite TJ General Discussion Forum 2 08-20-2008 10:00 PM


» Rates
Get low rates on auto insurance in Canada!

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 01:22 AM.



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