95 tranny freshening up - JeepForum.com

 
LinkBack Thread Tools
post #1 of 7 Old 06-17-2013, 10:23 AM Thread Starter
yamazinger
Registered User
1993 XJ Cherokee 
 
Join Date: Feb 2011
Location: allentown
Posts: 81
95 tranny freshening up

got a 95 with the 5.2 auto. its got about 230xxx on it so its certainly nearing the end of its life, but i have had a problem for a while with the motor. I changed the cap, rotor, plug wires and plugs and it happened either right before or after i changed them. i cant remember. but anyway the motor hesitates when i drive it calmly. if i give it a reasonable amount of gas the motor runs great and no problems. it hesitates and bucks when i keep it at a steady highway speed and right before the tranny shifts. it acts like it starts to run very lean like the 02 sensor or something is reading wrong and telling the motor to run lean. i ended up changing the plug wires like 2 or 3 times and nothing changed. checked everything as well as firing order of plug wires- all good. what would cause hesitation and bucking at steady highway speeds and right before the tranny shifts? it makes it terrible to drive any kind of distance and no one offered any good advice a year ago when i asked this same question. does it sound like a tranny issue or motor? i know it seems like the motor but im just not familiar with trannys enough to rule that out. thanks

yamazinger is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 06-17-2013, 02:46 PM
4x4andmetal
Registered User
1996 ZJ 
 
Join Date: Mar 2013
Location: Savannah
Posts: 92
That definitely could be an o2 sensors. If you replace them, make sure to get the mopar ones.

1996 4.0 Laredo. Weekend warrior
1999 Pontiac Grand prix GTP. Daily driver
1995 318 laredo. Gone
4x4andmetal is offline  
post #3 of 7 Old 06-17-2013, 03:06 PM
dellis
Registered User
2005 WK 
 
Join Date: Feb 2013
Location: Vienna
Posts: 348
When you accelerate, the computer will suspend the readings from the O2 sensor specifically to give you power with a richer mix. Then, when you let off of the gas and cruise, you will once more be using the information from the O2 sensor to regulate the air/fuel mixture.

So, yes, the O2 sensor could be your problem.

A quick way to diagnose is to disconnect your upstream O2 sensor and drive. It will throw a code but the computer will be using default values. If you notice that the problem disappears, then replace your O2 sensor. If not, then look elsewhere.
dellis is offline  
post #4 of 7 Old 06-17-2013, 03:17 PM
PolkaPower
Registered User
1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss
Posts: 19,314
Only one O2 on the 93-95's. Get a Mopar or NTK sensor.
PolkaPower is offline  
post #5 of 7 Old 06-18-2013, 04:09 AM Thread Starter
yamazinger
Registered User
1993 XJ Cherokee 
 
Join Date: Feb 2011
Location: allentown
Posts: 81
whats the deal with using off brand o2 sensors? i was looking at bosch. i dont foresee this jeep running many more years here so im just trying to get the issue resolved cheaply. and buying a dealer part is never cheap
yamazinger is offline  
post #6 of 7 Old 06-18-2013, 05:58 AM
PolkaPower
Registered User
1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss
Posts: 19,314
Quote:
Originally Posted by yamazinger View Post
whats the deal with using off brand o2 sensors? i was looking at bosch. i dont foresee this jeep running many more years here so im just trying to get the issue resolved cheaply. and buying a dealer part is never cheap
The aftermarket O2 sensors are more universal and not ZJ specific which can cause them to act like they are bad right out of the box.

Some info here http://www.jeepforum.com/forum/f13/o...506-a-1321465/
PolkaPower is offline  
post #7 of 7 Old 06-18-2013, 12:08 PM
eagsc7
Registered User
1994 ZJ 
 
Join Date: Apr 2013
Location: Sweetwater Cyt
Posts: 433
The thing to remember about ALL Jeeps is that even the Worst maintainer can keep these things going for over 500,000 Miles. Course, at that point your replacing the Drivers seat for Padding issues and realize that the floor under it has rusted out. This is from personal experience in Missouri where MODOT puts Salt on the roads. When it DOES rust out on you, get some plate steel and weld it on. Don't know how to weld? Watch some youtube vids and go for it! You can't screw too much up with a vehicle this old anyways.

Off to the JY for some more parts!
eagsc7 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com 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 e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome