Idle Problem - Jeep Wrangler Forum
Jeep Wrangler Forum

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

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-13-2009, 05:23 PM   #1
Newb
 
Join Date: Jun 2009
Posts: 4
Idle Problem

I have a 02 Wrangler and I just replaced the Throttle Position Sensor. It runs smoothly now and when I depress the clutch to slow down the R's are right where they should be, but once I come to a complete stop the R's fall to zero and the engine stalls out if I do not rev it up. I did not have this problem before replacing the TPS. Where should I look next? Any help would be greatly appreciated. Thanks, Chad

Chad 02 is offline   Quote Quick Reply
Old 06-13-2009, 06:19 PM   #2
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,451
Images: 2
Clean the IAC (idle air controller). The IAC provides all of the engine's air when your foot is not on the accelerator pedal so if it sticks from being dirty, the engine won't idle correctly. Start the engine and spray some Throttle Body cleaner into the TB, taking care to spray a moderate amount into the idle air passage inlet slot just above the butterfly valve. That slot is where the engine gets its air when the butterfly valve is closed at idle. Spraying into that slot while keeping the engine RPMs up with the throttle linkage to keep the engine from stalling should clean the IAC pretty effectively. If it needs to be cleaned more thoroughly to completely restore a good idle, the IAC will have to be removed. Just be gentle with the IAC's solenoid actuated plunger if you remove the IAC for a more thorough cleaning, don't push/pull/spin it while cleaning it.
Attached Images
 

__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 06-13-2009, 06:46 PM   #3
Newb
 
Join Date: Jun 2009
Posts: 4
Thanks. I will give it a try tomorrow.
Chad 02 is offline   Quote Quick Reply
Old 06-13-2009, 10:37 PM   #4
Jeeper
 
yjwes's Avatar
 
Join Date: May 2009
Location: howell nj
Posts: 369
also check your vss
yjwes is offline   Quote Quick Reply
Old 06-14-2009, 11:51 AM   #5
Jeeper
 
603TJ's Avatar
 
Join Date: Apr 2008
Location: New Hampshire
Posts: 191
Was changing the TPS difficult? That's the next step in finding the solution to my Jeep's problems.
__________________
98TJ. wheels. shocks. motor. other things that make a jeep move.
603TJ is offline   Quote Quick Reply
Old 06-14-2009, 12:25 PM   #6
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,451
Images: 2
Quote:
Originally Posted by 603TJ View Post
Was changing the TPS difficult? That's the next step in finding the solution to my Jeep's problems.
It's very easy, it's only held on with two small torx-head screws. When installing the new one, just make sure the little shaft that protrudes out of the throtte body properly engages the slot inside the TPS which is a no-brainer. That will involve rotating the new TPS slightly out of position to engage the shaft/slot, then just rotate it back into position so the screw holes line up. It's easier done than described.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 06-14-2009, 02:23 PM   #7
Newb
 
Join Date: Jun 2009
Posts: 4
Cleaning the IAC seemed to do the trick. Thanks for the help.
Chad 02 is offline   Quote Quick Reply
Old 06-14-2009, 02:25 PM   #8
Jeeper
 
Join Date: Aug 2008
Posts: 2,473
You must have replaced the TPS for a reason. As it went bad over time the PCM "learned" how to deal with it until it couldn't compensate. It finally gave you trouble and you replaced it.

But - the PCM is still trying to compensate for the old defective one - it's in the memory.

You have to "retrain" the PCM about the new TPS.

Reset the PCM memory back to default, then it'll learn the new one. Disconnect the battery for 1/2 hour or so, that should do it. If it still acts up, disconnect the battery overnight.

Sometimes after cleaning the throttle body you have to do the same thing.
__________________
It's no wonder the country is falling apart - stupidity abounds!
rrich is offline   Quote Quick Reply
Old 06-14-2009, 09:00 PM   #9
Newb
 
Join Date: Jun 2009
Posts: 4
That makes sense, since the stalling problem happened immediately after replacing the TPS. Thanks for the advice.
Chad 02 is offline   Quote Quick Reply
Old 06-15-2009, 02:36 PM   #10
Jeeper
 
603TJ's Avatar
 
Join Date: Apr 2008
Location: New Hampshire
Posts: 191
Quote:
Originally Posted by Jerry Bransford View Post
It's very easy, it's only held on with two small torx-head screws. When installing the new one, just make sure the little shaft that protrudes out of the throtte body properly engages the slot inside the TPS which is a no-brainer. That will involve rotating the new TPS slightly out of position to engage the shaft/slot, then just rotate it back into position so the screw holes line up. It's easier done than described.
Where is the TPS located? I have the new part, but I can't see where it's at.
__________________
98TJ. wheels. shocks. motor. other things that make a jeep move.
603TJ is offline   Quote Quick Reply
Old 06-15-2009, 02:49 PM   #11
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,451
Images: 2
Quote:
Originally Posted by 603TJ View Post
Where is the TPS located? I have the new part, but I can't see where it's at.
Look at the diagram already posted in post #2 above.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 06-15-2009, 07:56 PM   #12
Jeeper
 
603TJ's Avatar
 
Join Date: Apr 2008
Location: New Hampshire
Posts: 191
Job done. Problem: totally fixed. thanks!

__________________
98TJ. wheels. shocks. motor. other things that make a jeep move.
603TJ 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
check engine light came on and speedo stopped working @ the same time. eric TJ General Discussion Forum 14 10-14-2013 12:05 PM
4.2 carb problems stray YJ Tech Forum 18 12-27-2011 05:39 PM
hi idle problem xethos YJ Tech Forum 9 02-18-2009 10:33 PM
Consistent Idle problem, sputter @ idle-3000 whippet14 YJ General Discussion Forum 5 01-26-2006 07:41 AM
TJ Error codes khenderson TJ Tech Forum 3 08-19-2005 12:36 AM



» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 02:32 PM.



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