engine lean code - Jeep Wrangler Forum

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

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 02-16-2009, 03:55 PM   #1
Join Date: Dec 2008
Location: hudson, florida
Posts: 7
engine lean code

hello all
I have a 97 tj 2.5 its throwing a engine running lean code. i have changed upstream o2 sensor twice and it fixes it for a little while. I have checked for vacuum leaks but have found none. i cleaned throttle body with seafoam replaced iac, exhaust manifold, plugs,wires,cap, rotor, after it warms up while driving it wants to stall when i brake. i was searching and saw that the brake booster could be losing vacuum. how would i check it. it seems like a lot of people have the same lean o2 prob. but no one ever sais if they've ever fixed it and how. any ideas would be greatly appreciated. thanks in advance. this sight is awesome


achappy44 is offline   Quote
Old 12-17-2009, 10:34 AM   #2
Join Date: Dec 2009
Posts: 16
hey there im having similar problems with my 97 ... did anyone come up with an answer?

haaswyk is offline   Quote
Old 12-18-2009, 01:59 AM   #3
Join Date: Dec 2009
Posts: 16
so i have a 97 wrangler 2.5L stock with 31's

i get the code 51 and 52 wich is
51 A lean air/fuel mixture has been indicated by an abnormally rich correction factor.

52 A rich air/fuel mixture has been indicated by an abnormally rich correction factor.

so i replaced the following

front o2
Rear o2
cat converter (was plugged)
spark plugs
air filter

the code continues to come back and haunt me.... i cant figure out whats wrong.. the old plugs i pulled out were light brown ...not sooty

anyone have any ideas? im about to lose it with this truck...
haaswyk is offline   Quote

Thread Tools

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
rebuilding your engine?? Get Stroked!!! jeeper95yj YJ General Discussion Forum 6 01-01-2014 05:47 PM
engine code 8 elkhound TJ Tech Forum 2 08-01-2007 05:43 PM
Engine Code. Walkeraviator TJ Tech Forum 3 07-29-2007 10:29 AM
Engine Code? CJ2WRANGLER TJ Tech Forum 9 05-06-2007 10:59 PM
Engine light code 122 easyriderman72 TJ Tech Forum 2 03-05-2007 06:55 PM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 10:40 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

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