Low idle help - JeepForum.com
Reply
 
LinkBack Thread Tools
post #1 of 17 Old 07-27-2021, 05:29 PM Thread Starter
MackJartel
Registered User
 
Join Date: Feb 2018
Posts: 99
Low idle help

My 1995 grand 5.2 has had a low idle since I got it. Idles just above 0 around 200. The problem I’m curious about is when it’s warmed up and I’m slowing down the last shift is rough like a clunk. It was really bad but then I cleaned the throttle body. I can also shift to 2 just before it happens and it’s not as bad. I’ve replaced literally almost everything!! The 3 sensors in the throttle body are not mopar and the MaP Sensor failed after 15000k I have no clue what I can do now???

MackJartel is offline  
Sponsored Links
Advertisement
 
post #2 of 17 Old 07-27-2021, 05:40 PM Thread Starter
MackJartel
Registered User
 
Join Date: Feb 2018
Posts: 99
If I come to a stop quickly and the rpm isn’t too low it won’t shift rough. I’m convinced it’s the low idle.
MackJartel is offline  
post #3 of 17 Old 07-28-2021, 04:24 AM
V8GCZJ
Registered User
 
Join Date: Sep 2018
Posts: 770
Did you replace the iac?
V8GCZJ is offline  
 
post #4 of 17 Old 07-28-2021, 09:09 AM Thread Starter
MackJartel
Registered User
 
Join Date: Feb 2018
Posts: 99
Yes but not with mopar brand.
MackJartel is offline  
post #5 of 17 Old 07-28-2021, 05:17 PM
Hempinfool
Registered User
 
Hempinfool's Avatar
1989 YJ Wrangler 
 
Join Date: Jan 2012
Location: Chapel Hill
Posts: 97
I am confused a lil.
Is the idle RPM always low?
Or only after driving and coming to a stop?

Codes?
Disconnect battery to reset PCM?
Hempinfool is offline  
post #6 of 17 Old 07-29-2021, 04:48 AM
V8GCZJ
Registered User
 
Join Date: Sep 2018
Posts: 770
Where does it idle in neutral?
V8GCZJ is offline  
post #7 of 17 Old 07-29-2021, 09:42 AM Thread Starter
MackJartel
Registered User
 
Join Date: Feb 2018
Posts: 99
It runs and shifts great. Only problem is when I slow down the rpm are very low and the last shift down is around 500rpm and there is a clunk. Low idle too about 200. I can ease the clunk if i shift to 2 just before that last down shift.
MackJartel is offline  
post #8 of 17 Old 07-29-2021, 12:57 PM Thread Starter
MackJartel
Registered User
 
Join Date: Feb 2018
Posts: 99
No codes. Battery has been disconnected many times. I’ve basically replaced everything on the vehicle.
MackJartel is offline  
post #9 of 17 Old 07-29-2021, 02:13 PM
Hempinfool
Registered User
 
Hempinfool's Avatar
1989 YJ Wrangler 
 
Join Date: Jan 2012
Location: Chapel Hill
Posts: 97
So, if you put it in neutral at speed and then come to a stop, the RPM is good, or does it do the same thing?
Hempinfool is offline  
post #10 of 17 Old 07-29-2021, 05:07 PM Thread Starter
MackJartel
Registered User
 
Join Date: Feb 2018
Posts: 99
No clunk at all as it’s out of gear. Idles a bit better but not much. Park it idles similar to N
MackJartel is offline  
post #11 of 17 Old 07-29-2021, 07:31 PM
PolkaPower
Registered User
 
PolkaPower's Avatar
1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss
Posts: 23,689
It might help if you listed everything you replaced and if it's mopar or aftermarket part.


Sent from my iPhone using Tapatalk
PolkaPower is offline  
post #12 of 17 Old 07-30-2021, 12:59 PM Thread Starter
MackJartel
Registered User
 
Join Date: Feb 2018
Posts: 99
Nothing is mopar.
I’ve replaced
Iac
Map sensor which failed after 15k so I put original back in
TPS
Coolant temperature sender
Thermostat
Serp belt
Radiator and all hoses
Cap
Rotor
Plugs
Wires
Coil pack
Plenum gasket
Both valve cover gaskets
Battery
Air filter
Idler pulley
PCV valve
Fuel filter
Cleaned injectors
No vacuum leaks
MackJartel is offline  
post #13 of 17 Old 07-30-2021, 01:00 PM Thread Starter
MackJartel
Registered User
 
Join Date: Feb 2018
Posts: 99
And O2 sensor
MackJartel is offline  
post #14 of 17 Old 07-31-2021, 05:10 AM
V8GCZJ
Registered User
 
Join Date: Sep 2018
Posts: 770
Quote:
Nothing is mopar
The iac is one of the things that should be oem. I have heard of people trying 3-4 of the aftermarket ones before getting one that works. You may also want to check the fuel pressure. If pressure is in spec the iac is the problem. You said you cleaned the throttle body but did you pay special attention to the ports where the iac is? They clog up with carbon and can cause issues.
V8GCZJ is offline  
post #15 of 17 Old 07-31-2021, 05:59 AM
PolkaPower
Registered User
 
PolkaPower's Avatar
1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss
Posts: 23,689
Yes, all important sensors should be factory. 02 sensors can be ngk. They make the mopar stuff.


Sent from my iPhone using Tapatalk
PolkaPower 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











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