NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA's Technical Forums > OEM Tech Discussion
Register FAQ Users List Calendar Mark Forums Read
HOME Member FAQ Sponsor Info Rules Donate Bylaws Store Members Chat E-Mail

OEM Tech Discussion Forum for OEM (Original Equipment) or stock XJs and MJs.

Reply
 
Thread Tools Display Modes
  #1  
Old August 10th, 2017, 07:35
Jet noise Jet noise is offline
NAXJA Forum User
 
Join Date: Apr 2016
Location: Phoenix
Posts: 12
Idle issue

So I just bought a 97 XJ, 4.0l, auto, 242 t case. It used to be a government vehicle and has 160 on the odo. It ran fine when I bought it, ran smooth for another week or so, until now.

My issue is, the jeep will start and run, as long as I keep my foot on the gas. Take foot off pedal, and she dies. I just will not idle. I swapped the MAP sensor off my 01XJ, and that didn't help.

Looking for pointers on where to look!
Reply With Quote
  #2  
Old August 10th, 2017, 08:35
comanche91's Avatar
comanche91 comanche91 is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Sweet Home Alabama
Posts: 464
Re: Idle issue

TPS or possible CPS. Did you check for fault codes?
Reply With Quote
  #3  
Old August 10th, 2017, 11:49
SBpunk SBpunk is offline
NAXJA Forum User
 
Join Date: Jan 2013
Location: Enid, OK
Posts: 335
Re: Idle issue

Check the kick down cable make sure its tight. Easy and free box to check off. Next look for the EXT IDLE switch should be around your fog lights/rear wiper area. Mess with that see if it helps (switch to the other position). Once that's done head down to Orielly Auto if you have one. Rent a fuel pressure testing kit. You're going to have to google what its supposed to be at. Crank it and test to make sure you have fuel pressure and return it.

Even before that check the vacuum on the MAP sensor, fuel pressure regulator, brake booster and the rest of them.

Before you buy new sensors check out strokedjeep.com and shoot him an email. He usually has throttle body sensors for dirt cheap and test them before sending them out. I'm thinking its most likely a vacuum issue.
Reply With Quote
  #4  
Old August 10th, 2017, 11:52
Jet noise Jet noise is offline
NAXJA Forum User
 
Join Date: Apr 2016
Location: Phoenix
Posts: 12
Idle issue

Quote:
Originally Posted by comanche91 View Post
TPS or possible CPS. Did you check for fault codes?


I did, there were no codes.
Reply With Quote
  #5  
Old August 10th, 2017, 11:53
old_man's Avatar
old_man old_man is offline
NAXJA Member
 
Join Date: May 2003
Location: Loveland, Colorado
Posts: 15,455
Re: Idle issue

How about scanning it with a computer first?
__________________
Tom Houston - Former Colorado Chapter President & Terminal Adrenaline Junkie
Loveland, Colorado
You're just jealous because the voices don't talk to you.
Reply With Quote
  #6  
Old August 10th, 2017, 11:53
Jet noise Jet noise is offline
NAXJA Forum User
 
Join Date: Apr 2016
Location: Phoenix
Posts: 12
Idle issue

Quote:
Originally Posted by SBpunk View Post
Check the kick down cable make sure its tight. Easy and free box to check off. Next look for the EXT IDLE switch should be around your fog lights/rear wiper area. Mess with that see if it helps (switch to the other position). Once that's done head down to Orielly Auto if you have one. Rent a fuel pressure testing kit. You're going to have to google what its supposed to be at. Crank it and test to make sure you have fuel pressure and return it.

Even before that check the vacuum on the MAP sensor, fuel pressure regulator, brake booster and the rest of them.

Before you buy new sensors check out strokedjeep.com and shoot him an email. He usually has throttle body sensors for dirt cheap and test them before sending them out. I'm thinking its most likely a vacuum issue.


Good info, thanks! I'll do some checking tonight 👍
Reply With Quote
  #7  
Old August 10th, 2017, 12:18
sidewaysstarion's Avatar
sidewaysstarion sidewaysstarion is offline
Coffee Drinker
 
Join Date: Jan 2012
Location: Torrance, CA
Posts: 2,440
Re: Idle issue

It sounds like you have the combination of a dying battery and a dirty throttle body. If you clean the throttle body it should fix your issue. Also you might want to get your battery checked.
__________________
Quote:
Originally Posted by cracker
I seem to have run out of self tapping washers
99 4.0/AW4/231 8.25/D30 ARB's 4.56's 33's deavers and a few other things.

Click here to join the red team
Reply With Quote
  #8  
Old August 10th, 2017, 12:39
RCP Phx RCP Phx is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Phoenix,Az
Posts: 10,271
Re: Idle issue

You also need to check the IAC.
Reply With Quote
  #9  
Old August 12th, 2017, 15:01
Ecomike's Avatar
Ecomike Ecomike is offline
NAXJA# 2091
 
Join Date: Dec 2006
Location: Texas
Posts: 14,548
Re: Idle issue

Any other issues other than it dies at idle?

Could be any of a number of things. Get a volt meter and test the TPS idle position voltage.

May just need a tune up, new air filter (is it soaked in oil?), spark plugs (are they fouled, gap too wide from wear), cap and rotor (too worn and eroded?).

IAC may be fouled and sticking. Idle Air Control. Pull a vacuum hose loose on the intake manifold (use the one in the rear that goes across the top of the engine to carbon canister on the passenger side) and if see it idles with out dying? Ill bet it runs when you do this!!!! If it does, you need to focus on why it is starving for air at idle.

Air filter, IAC, TPS are top selections.

CPS can be tested sort of with an ohm meter, but it is no conclusive.

Quote:
Originally Posted by SBpunk View Post
Check the kick down cable make sure its tight. Easy and free box to check off. Next look for the EXT IDLE switch should be around your fog lights/rear wiper area. Mess with that see if it helps (switch to the other position).
What???? Kick down cable for an idle issue? WTF is an EXT IDLE switch?

Are you talking about XJ jeeps or what?
__________________
Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091

Last edited by Ecomike; August 12th, 2017 at 15:06.
Reply With Quote
  #10  
Old August 12th, 2017, 15:03
Ecomike's Avatar
Ecomike Ecomike is offline
NAXJA# 2091
 
Join Date: Dec 2006
Location: Texas
Posts: 14,548
Re: Idle issue

Quote:
Originally Posted by sidewaysstarion View Post
It sounds like you have the combination of a dying battery and a dirty throttle body. If you clean the throttle body it should fix your issue. Also you might want to get your battery checked.
If it starts and cranks, I would not suspect the battery for an "it runs if I give it gas, but will not idle..." Also it is OBD-II with no codes thrown.
__________________
Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
Reply With Quote
  #11  
Old August 19th, 2017, 10:12
Jet noise Jet noise is offline
NAXJA Forum User
 
Join Date: Apr 2016
Location: Phoenix
Posts: 12
Idle issue

Thanks for all the help, guys. I let it sit for a while before I had a minute to mess with it. Today I pulled the throttle body off and gave it a good cleaning. I didn't think this would fix my issue because it wasn't overly nasty. Anyway I cleaned it all up and put a new gasket down. Hooked it all back up and cranked her up. She was rough at first but smoothed right out and runs like a champ now.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Odd idle issue W1zardofozz OEM Tech Discussion 1 February 15th, 2016 08:42
idle issue frankrizzo OEM Tech Discussion 1 April 7th, 2012 18:49
Strange idle/brake issue/ voltage drop issue stockli OEM Tech Discussion 0 May 15th, 2011 17:02
Idle issue Cowboydoc OEM Tech Discussion 0 August 7th, 2007 07:18
Idle Issue jeepsrock OEM Tech Discussion 15 March 20th, 2006 17:27


All times are GMT -7. The time now is 00:29.


Powered by vBulletin® Version 3.8.3
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014