V8 5.2l jeep engine unstable rpm - JeepForum.com
LinkBack Thread Tools
post #1 of 3 Old 06-16-2014, 07:31 PM Thread Starter
Registered User
1995 ZJ 
Join Date: Jun 2014
Location: Fresno
Posts: 9
V8 5.2l jeep engine unstable rpm

Hello everyone,
My grand cherokee with 225k miles on it.
Has a new water pump new iac cleaned throttle body
And a new thermostat it was getting a bit hot.
I also have a new 2 row all aluminum tig welded radiator
Ready to go in it. Every now and then my car will have unstable rpms you could floor the gas and it would not move or respond.
Instead the rpms will go up and down and the car may shut off.
This stupid shop for 200 cleaned my throttle body and did not replace the iac so I did. They said that was the problem they also said it threw a map error I was told maybe a vacuum leak.
Anyone have any ideas for me?

gloveless is offline  
Sponsored Links
post #2 of 3 Old 06-16-2014, 08:50 PM
Registered User
2011 WK 
Join Date: Dec 2013
Location: Laval
Posts: 183
Yea i had similar problems long time agoooo, it can be a faulty oxygen sensor or TPS, i replaced all of those since one time it was my tps, after a few months o2 and so on. Its not hard and expensive u might wanna do those, i know a guy hes a mechanic and owns a zj too, he said 50k is a limit for those sensors on zj's, they just go bad and give u headaches , id start there if there is no specific sound/knock/grind/ etc ... one thing my zj taught me is that if there is no "sound" its a sensor hahaha
Alexandru999 is offline  
post #3 of 3 Old 06-17-2014, 12:24 PM Thread Starter
Registered User
1995 ZJ 
Join Date: Jun 2014
Location: Fresno
Posts: 9
I'll give that a try does anyone know were those are at? As well as how I should go about changing those things?
gloveless is offline  

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


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