Go Back  Jeep Cherokee Forum > General > Cherokee Chat
Just bought a Jeep with lean fuel mixture- 2000 stock cherokee >

Just bought a Jeep with lean fuel mixture- 2000 stock cherokee

Cherokee Chat General non-tech Cherokee chat
XJ/MJ/ZJ/WJ

Just bought a Jeep with lean fuel mixture- 2000 stock cherokee

Old 12-22-2018, 01:25 PM
  #1  
Newbie
Thread Starter
 
Join Date: Dec 2018
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Model: Cherokee (XJ)
Default Just bought a Jeep with lean fuel mixture- 2000 stock cherokee

I just got a new Jeep and was informed that, when it was taken to the mechanic they made the fuel mixture lean for some reason and is now causing issues with accelerating and hesitating, and has stalled before. I'm wondering if anyone knows how to adjust the fuel mixture on a xj, from my understanding there is no adjustment screw so I'm at a loss and don't know what could have been done to my Jeep to make it run leaner! Really need y'all's help, thank ya kindly! P.s just had fuel pump and crankshaft sensor replaced
oneillmax@gmail.com is offline  
Old 12-23-2018, 05:27 PM
  #2  
CF Veteran
 
jordan96xj's Avatar
 
Join Date: Dec 2015
Location: Syracuse, NY
Posts: 1,927
Likes: 0
Received 0 Likes on 0 Posts
Year: 1996
Model: Cherokee (XJ)
Engine: 4.0L
Default

The mixture on your XJ is not adjustable. It is managed by the computer (PCM). The primary components involved are the MAP sensor, and the O2 sensors. These are responsible for measuring the air coming into the motor, as well as the amount of oxygen remaining in the exhaust gases after combustion. By monitoring the values these sensors provide, the computer can adjust the amount of fuel being delivered via the fuel injectors. Any competent independent mechanic should be able to troubleshoot a mixture problem and help get things back to normal. If you are doing it yourself, I recommend having access to at least a cheap OBD2 scanner that can provide you data on O2 sensor voltages and fuel trim values. This will help you better understand what the computer is doing, and give you a starting point. It can also help to show that whatever fix you decide on has been effective.

Failed MAP, O2 sensors, and air leaks (called vacuum leaks) are the primary culprits.
jordan96xj is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Kyle Karbum
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
11
01-20-2017 07:33 PM
well1done
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
1
11-18-2013 05:58 PM
Anel
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
8
08-13-2013 11:37 AM
sawdustmaker
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
6
05-09-2011 05:34 PM
boy_named_sue
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
6
02-23-2011 08:21 PM

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

Thread Tools
Search this Thread
Quick Reply: Just bought a Jeep with lean fuel mixture- 2000 stock cherokee


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: