Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here! ZJ (93-98), WJ (99-04), WK (05+)
All ZJ/WJ/WK specific tech questions asked here!

Still rough idling!! Help!

Old 09-19-2016, 05:16 PM
  #1  
Newbie
Thread Starter
 
Join Date: Sep 2016
Posts: 8
Model: Cherokee
Default Still rough idling!! Help!

Had posted a thread in regards to my 2001 Jeep GC Limited 4.7 4X4 idling very rough and shutting off. Been doing a lot of diagnosing and still nothing. Compression good in all cylinders, cleaned the TB, replaced the spark plugs, changed out my IAC valve, and still running really rough!!! My spark plugs show that it's running real rich, all came out black(new plugs). Got it up to highway speeds and it runs very smooth. I'm thinking it's a fuel issue cause when it's idling I can smell the excess fumes and at highway speed it runs smooth, I believe cause it's burning off that excess fuel. Need some help on this..... any ideas? Thanks.
tuekwik is offline  
Old 09-20-2016, 02:49 AM
  #2  
CF Veteran
 
Join Date: Nov 2015
Location: syracuse ny
Posts: 1,644
Year: 1997
Model: Grand Cherokee
Engine: 4.0
Default

I would say it's running way too rich. Not so familiar with the 01. What's your fp gauge tell you?
97grand4.0 is offline  
Old 09-20-2016, 01:43 PM
  #3  
Newbie
Thread Starter
 
Join Date: Sep 2016
Posts: 8
Model: Cherokee
Default

Definitely too much fuel, buying a fuel pressure gauge to see how much fuel pressure I'm runnng. Thru all this research I have come accross so many possible issues, it's crazy. Info overload, if indeed there is too much fuel going in, how am I going to diagnose what is causing it?
tuekwik is offline  
Old 09-20-2016, 01:50 PM
  #4  
CF Veteran
 
Join Date: Nov 2015
Location: syracuse ny
Posts: 1,644
Year: 1997
Model: Grand Cherokee
Engine: 4.0
Default

Originally Posted by tuekwik View Post
Definitely too much fuel, buying a fuel pressure gauge to see how much fuel pressure I'm runnng. Thru all this research I have come accross so many possible issues, it's crazy. Info overload, if indeed there is too much fuel going in, how am I going to diagnose what is causing it?
Have to have the basics before you can start guessing, actually, the object is to avoid guessing. Read your FP first then go from there. If your injectors are faulty or the o rings bad, the FP gauge will show the drop in pressure. If we decide the fuel side is ok then start looking elsewhere.
97grand4.0 is offline  
Old 09-20-2016, 02:28 PM
  #5  
CF Veteran
 
Hommersimpson's Avatar
 
Join Date: Jan 2010
Location: St Augustine Florida
Posts: 1,087
Year: 1992
Model: Cherokee
Engine: 4.0
Default

if all the plugs are black.. suspect faulty 02 sensor
Hommersimpson is offline  
Old 09-20-2016, 05:04 PM
  #6  
Newbie
Thread Starter
 
Join Date: Sep 2016
Posts: 8
Model: Cherokee
Default

Appreciate the responses, which O2 sensor??? I think I counted 3 in all, 1 on the downpipe and 1 on each of the converters. Faulty O2 sensor would cause it to run rich????
tuekwik is offline  
Old 09-22-2016, 06:07 PM
  #7  
Newbie
Thread Starter
 
Join Date: Sep 2016
Posts: 8
Model: Cherokee
Default

NOTHING!!!!! HELP PLEASE!!!!!! LOL! End of my witts
tuekwik is offline  
Old 09-22-2016, 08:04 PM
  #8  
CF Veteran
 
Join Date: Nov 2015
Location: syracuse ny
Posts: 1,644
Year: 1997
Model: Grand Cherokee
Engine: 4.0
Default

Originally Posted by tuekwik View Post
Definitely too much fuel, buying a fuel pressure gauge to see how much fuel pressure I'm runnng. Thru all this research I have come accross so many possible issues, it's crazy. Info overload, if indeed there is too much fuel going in, how am I going to diagnose what is causing it?
How is the new fuel pressure gauge working?
97grand4.0 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
knolan1226
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
3
08-28-2016 10:53 AM
trev0006
Cherokee Chat
0
08-27-2016 12:16 PM
encinoman9345
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
4
08-26-2016 09:11 PM
Programbo
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
9
08-26-2016 05:45 PM
CCKen
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
3
08-22-2016 07:37 PM

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

Thread Tools
Search this Thread
Quick Reply: Still rough idling!! Help!


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: