NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Other Technical Forums > Jeep CJs and Wranglers > Wrangler YJ, TJ, and LJ (1987 - 2006)
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

Wrangler YJ, TJ, and LJ (1987 - 2006) Technical forum for the Wrangler YJ, TJ, and LJ Unlimited.

Reply
 
Thread Tools Rate Thread Display Modes
  #1  
Old February 9th, 2019, 21:07
Cwburrell Cwburrell is offline
NAXJA Member
 
Join Date: Jan 2019
Location: Texas
Posts: 11
Extremely cold natured YJ

I have an 89 wrangler YJ TBI with 2.5 liter 4 cylinder that is hard to start when itís cold. It will fire rather quickly but immediately dies. Sometimes it takes 15 or 20 tries to keep it running. Once it warms up, it runs well. I noticed the electric fuel pump stays running almost constantly when the key is turned to the run position. Should it only run for a few seconds until it pressures up and then kick off? Any suggestions would be appreciated.
Reply With Quote
  #2  
Old February 10th, 2019, 16:47
Ecomike's Avatar
Ecomike Ecomike is offline
NAXJA# 2091
 
Join Date: Dec 2006
Location: MilkyWay Galaxy
Posts: 15,266
Re: 2.5 L TBI 89 cold start issues

Being a 2.5 L TBI, that was part GM stuff and part Chrysler stuff, I would track down some folks familiar with it. I thought at one time they MPI, but they may well have some differences I know noting about. Nick at nickintime on youtube, or here, may know a little about them, as his new REM scanners can now access the 2.5 L, 4 banger ECUs as well as the 4.0.

Maybe the main difference is just one injector??? If so, I could help some.

Oh, and it also sounds like the FPR is bad reading the first post here (or relay is stuck??). Unless the TBI had a lower pressure, and different pump and FPR from the 4.0s ??? I worked on an 84 once and it had an old style mechanical pump that ran off CAM.
__________________
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
  #3  
Old February 10th, 2019, 16:50
Ecomike's Avatar
Ecomike Ecomike is offline
NAXJA# 2091
 
Join Date: Dec 2006
Location: MilkyWay Galaxy
Posts: 15,266
Re: Extremely cold natured YJ

Since it is temp related I would check the MAP Vacuum line and ends for any weakness/leaking at all.

Check the IAT air temp sensor in the Intake and clean it. Test it for proper resistance at cold temps.

Check the TPS voltage when cold and warmed up. And for sure clean up the sensor ground contacts surfaces!!!
__________________
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
  #4  
Old February 10th, 2019, 21:52
Cwburrell Cwburrell is offline
NAXJA Member
 
Join Date: Jan 2019
Location: Texas
Posts: 11
Re: Extremely cold natured YJ

MAP Iím assuming is manifold air pressure? Iíve checked all vacuum lines but Iíll go over everything again just to be sure.

I replaced both the IAT and TPS early on in the troubleshooting but it didnít change anything.
Reply With Quote
Reply


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

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
Extremely bad vibration mknack Modified Tech Discussion 7 December 21st, 2009 14:39
extremely po'd XgeekstarX Non-Tech / Off Topic 53 October 14th, 2006 19:36
Extremely worried the chariot OEM Tech Discussion 3 May 10th, 2006 05:38
Cold Starting problems, and running rough when engine is cold Culinary_Hooligan OEM Tech Discussion 0 December 8th, 2005 01:52
suddenly cold-natured dusterboy71 OEM Tech Discussion 1 August 3rd, 2004 06:29


All times are GMT -7. The time now is 10:56.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014