4.0 problem Help - Pirate4x4.Com : 4x4 and Off-Road Forum
 
Pirate4x4.Com : 4x4 and Off-Road Forum  

Go Back   Pirate4x4.Com : 4x4 and Off-Road Forum > Brand Specific Tech > Jeep - Non Hardcore
Notices

Reply
 
Share LinkBack Thread Tools Display Modes
Old 02-16-2016, 05:19 PM   #1 (permalink)
Registered User
 
adam36830's Avatar
 
Join Date: Mar 2009
Member # 132434
Location: Auburn, AL
Posts: 77
4.0 problem Help

Hello all,

I have a 97 ZJ with a 4.0. I bought it not running and have been able to get it to crank and run just not run very well. Looking for a little help.

Symptoms: Cold cranks and idles between 1k and 500 for about 20 seconds and then dies (idle jumps between 500 and 1k). When I'm able to start driving the ZJ before it dies it will run great through 1st and 2nd. When it gets to overdrive it boggs down and starts to spudder some and a huge lose in power. Currently no codes are showing when I do the key trick. Only 12 and then 55.

Things I have done up to this point:
Removed the throttle body and cleaned it.
Replaced the IACV
Replaced the Air Intake Temp Sensor (was getting a code 23)
Replaced CKPS
Replaced Camshaft Position Sensor
Replaced the PCM
Replaced All wires and spark plugs
Replaced Rotor cap and rotor button have

Any help will be greatly appreciated and thank you all.
__________________
85 yota-LQ4/4L80e/NP203/NP205/5.71/exo Build Thread: toyota-truck-4runner/980213-my-85-toyota-build
adam36830 is offline   Reply With Quote Quick reply to this message
Old 02-16-2016, 05:49 PM   #2 (permalink)
Pirate4x4 Addict!
 
Weasel's Avatar
 
Join Date: Jul 2001
Member # 5639
Location: Rapid City, SD
Posts: 16,626
Blog Entries: 1
throttle position sensor?
__________________

Kindness doesn't condemn or condone

Just Add Lightness
Weasel is offline   Reply With Quote Quick reply to this message
Sponsored Links
Old 02-17-2016, 10:25 AM   #3 (permalink)
Dunes & Forest
 
fantic238's Avatar
 
Join Date: Sep 2009
Member # 142612
Location: Italy
Posts: 4,136
check your fuel pressure, chances are the fuel pump turns slowly and is dying
__________________
Quote:
Find your own tranny pics you sick fuck.
fantic238 is offline   Reply With Quote Quick reply to this message
 
Old 02-17-2016, 02:18 PM   #4 (permalink)
Registered User
 
adam36830's Avatar
 
Join Date: Mar 2009
Member # 132434
Location: Auburn, AL
Posts: 77
Quote:
Originally Posted by fantic238 View Post
check your fuel pressure, chances are the fuel pump turns slowly and is dying
should i check this while it is running? It hold 40lbs when I turn in over before it dies
__________________
85 yota-LQ4/4L80e/NP203/NP205/5.71/exo Build Thread: toyota-truck-4runner/980213-my-85-toyota-build
adam36830 is offline   Reply With Quote Quick reply to this message
Old 02-17-2016, 02:20 PM   #5 (permalink)
Registered User
 
Join Date: Jan 2007
Member # 85771
Location: Minnysooota
Posts: 18,418
fuel pump?
__________________
Make Forums Great Again!
ky scrambled is offline   Reply With Quote Quick reply to this message
Old 02-18-2016, 01:35 AM   #6 (permalink)
Dunes & Forest
 
fantic238's Avatar
 
Join Date: Sep 2009
Member # 142612
Location: Italy
Posts: 4,136
Quote:
Originally Posted by adam36830 View Post
should i check this while it is running? It hold 40lbs when I turn in over before it dies
Pull the gauge up to the windshield under the wiper and go test drive it, if the pressure drops below 30 psi when the engine bogs the pump is shot.
__________________
Quote:
Find your own tranny pics you sick fuck.

Last edited by fantic238; 02-18-2016 at 01:35 AM.
fantic238 is offline   Reply With Quote Quick reply to this message
Old 02-18-2016, 01:38 AM   #7 (permalink)
Dunes & Forest
 
fantic238's Avatar
 
Join Date: Sep 2009
Member # 142612
Location: Italy
Posts: 4,136
If it isn't the fuel pump next step I would check the vacuum line to the MAP sensor.
__________________
Quote:
Find your own tranny pics you sick fuck.
fantic238 is offline   Reply With Quote Quick reply to this message
Old 02-18-2016, 02:33 PM   #8 (permalink)
Registered User
 
adam36830's Avatar
 
Join Date: Mar 2009
Member # 132434
Location: Auburn, AL
Posts: 77
Thanks guys. I will test all of these in the morning. Working the dreaded second shift.
__________________
85 yota-LQ4/4L80e/NP203/NP205/5.71/exo Build Thread: toyota-truck-4runner/980213-my-85-toyota-build
adam36830 is offline   Reply With Quote Quick reply to this message
Old 02-21-2016, 11:27 AM   #9 (permalink)
Registered User
 
Join Date: Feb 2006
Member # 67606
Posts: 847
Got an '02 that would bogg down after warmup. I removed/bypassed the cat and fixed it
Kickin'Chicken is offline   Reply With Quote Quick reply to this message
Old 02-21-2016, 01:59 PM   #10 (permalink)
Registered User
 
adam36830's Avatar
 
Join Date: Mar 2009
Member # 132434
Location: Auburn, AL
Posts: 77
weekend update

so i replaced the TPS and check fuel pressure again. held 50 psi even under load. also looked at the MAP sensor vacuum hose. Looked to be in could condition. Still clueless.
__________________
85 yota-LQ4/4L80e/NP203/NP205/5.71/exo Build Thread: toyota-truck-4runner/980213-my-85-toyota-build
adam36830 is offline   Reply With Quote Quick reply to this message
Old 02-22-2016, 02:11 AM   #11 (permalink)
Dunes & Forest
 
fantic238's Avatar
 
Join Date: Sep 2009
Member # 142612
Location: Italy
Posts: 4,136
Do you have a factory service manual? I would at this point check the distributor indexing.
You need to place the engine at TDC and set the distributor rotor at 4 o'clock (or opposite).

Timing a 4.0L - JeepForum.com

The distributor gear might be off 1 tooth.
__________________
Quote:
Find your own tranny pics you sick fuck.
fantic238 is offline   Reply With Quote Quick reply to this message
Old 02-22-2016, 07:55 AM   #12 (permalink)
Registered User
 
Join Date: Jun 2008
Member # 114810
Posts: 625
I've had similar issues with a 4.0 yj due to clogged fuel injectors. It sat for a few years and the fuel filter rusted, allowing the rust into the fuel rail upon starting it.

Pull the fuel rail and injectors. see if a bunch of crap is sitting between the injectors and rail. I had to remove the regulator and flush the rail a few times.
engnmonkey is offline   Reply With Quote Quick reply to this message
Old 02-22-2016, 08:06 AM   #13 (permalink)
Registered User
 
Join Date: Mar 2003
Member # 17768
Location: Roseville, CA
Posts: 292
Had a similar issue, remove the cat or test with a infared temp gun (to see if it's clogged). The innards of the converter break apart and clog the exhaust.
antelopeXJ is offline   Reply With Quote Quick reply to this message
Old 02-24-2016, 06:51 PM   #14 (permalink)
Registered User
 
Join Date: Oct 2015
Member # 613514
Location: Circling the den of evil
Posts: 759
Quote:
Originally Posted by antelopeXJ View Post
Had a similar issue, remove the cat or test with a infared temp gun (to see if it's clogged). The innards of the converter break apart and clog the exhaust.
You can pull the front O2 sensor and that'll allow it to breathe enough to see if it's a cat issue. I had the same problem where it would run fine until it got on the highway, then fall flat on its face. Pulling the O2 sensors let it run well enough for me to get it home and work on it.

If you do end up replacing the cat, I'd go OEM unless you plan on selling it within a year. I've not had much luck with longevity with either the aftermarket cheapie or high performance cats.
Apodyopsis is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Pirate4x4.Com : 4x4 and Off-Road 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:
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.

** A VERIFICATION EMAIL IS SENT TO THIS ADDRESS TO COMPLETE REGISTRATION!! **

Email Address:
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 10:14 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 ©2011, Crawlability, Inc.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.