NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > OEM Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

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

Thread Tools Display Modes
Old August 15th, 2005, 00:24
180*OUT 180*OUT is offline
NAXJA Forum User
Join Date: Jul 2005
Location: OGDEN, UTAH
Posts: 2
Running Problems

I have installed a 4.0L from a 96 XJ into my 86 CJ. (Its OK, I own 2 XJs also, no jokes please) It seems to run good with plenty of power but has a problem with a miss at all RPM's. The computer code (p0171) says it is sensing a lean mixture and is overcompensating and running rich. I have checked and cannot find any vacuum leaks. I have changed the fuel rail and installed new o rings. I also had a shop check and they couldn't find anything. I have swapped all the sensors (TPS, O2, MAP, Idle solenoid) with no difference. I am using an aftermarket Pressure Regulator and am getting the proper 49 PSI.
The other code I get is (76?) which is overvoltage. I know the computer controls the voltage regulation. The voltage measures 14.8 volts. Could there be some link here?
I am at a loss, anyone have any ideas? I appreciate any help you might give.
Reply With Quote
Old August 15th, 2005, 06:05
RichP's Avatar
RichP RichP is offline
NAXJA Forum User
Join Date: May 2002
Location: Effort, Pa
Posts: 15,606
Re: Running Problems

Does the 96XJ use one or two O2 sensors ? I know 97+ uses two, one on the downpipe and one by the cat for downstream. I'm not sure of the relationship between the two or what effect not having the second one would be. Also what about your grounds ? got enough of them and are they all clean ? Might consider running a few heavier ones between the engine > frame, engine > firewall, engine > battery.
Reply With Quote
Old August 15th, 2005, 14:01
180*OUT 180*OUT is offline
NAXJA Forum User
Join Date: Jul 2005
Location: OGDEN, UTAH
Posts: 2
Re: Running Problems

It uses 2. The downstream one, behind the cat, compares to the upstream one to check the cat is working properly. I have swapped those out and tried a few other things with them. Most of all the grounds are at least 10 ga other than the engine to chassis and engine to body which is braided cable.
Reply With Quote

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
Running real HOT! JungleXJ Modified Tech Discussion 12 September 26th, 2004 19:18
Rig running poorly after O2 sensor changed... cyberbackpacker OEM Tech Discussion 2 August 31st, 2004 17:01
o2 sensor problems lankchevy OEM Tech Discussion 10 July 23rd, 2004 20:12
Steering Question / Running lift gixer Modified Tech Discussion 0 November 3rd, 2003 06:28
Lift problems Alan Marshall Modified Tech Discussion 9 April 20th, 2003 12:00

All times are GMT -7. The time now is 06:09.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014