idle issue after changing exhaust manifold -

LinkBack Thread Tools
post #1 of 7 Old 07-25-2013, 03:08 PM Thread Starter
Registered User
1999 FSJ Cherokee 
Join Date: Jul 2013
Location: murfreesboro
Posts: 7
idle issue after changing exhaust manifold

Ok, i know i probably screwed something up. I just finished replacing the exhaust manifold on my 99 Cherokee 4.0, which of course meant i had to remove the intake manifold, power steering pump and electric fan to do it. I put everything back together and now when i start the motor it immediately wants to red line, so i shut other down. I double checked all my electrical connections and they look good. Any idea what is wrong?

sreilly1 is offline  
Sponsored Links
post #2 of 7 Old 07-25-2013, 04:32 PM
Registered User
1995 XJ Cherokee 
Join Date: Oct 2007
Location: Whitesburg
Posts: 5,293
With the motor running that fast it has to be getting air from somewhere. Double check the throttle body. Make sure there is nothing holding the throttle plate open.

Sent from my phone

95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
Originally Posted by Azzy View Post
You can tell the character of a person in how they treat someone who can do nothing for them.
Holder350 is offline  
post #3 of 7 Old 07-25-2013, 04:37 PM
Registered User
1990 XJ Cherokee 
Join Date: May 2011
Location: wrightstown
Posts: 466
Recheck all the manifold bolts, might have missed one so the intake is sucking in lots of air
miceanic is offline  
post #4 of 7 Old 07-25-2013, 05:20 PM
Real Jeeps have dents
CJ7-Tim's Avatar
2000 XJ Cherokee 
Join Date: Apr 2002
Location: out in the garage - Minneapolis
Posts: 24,948
Those are common symptoms of incorrectly re-installing the intake manifold. There is a massive air leak at the intake manifold gasket.

You will have to unbolt the intake manifold, and re-seat it square and flush to the head. If necessary, run a drill bit into the holes the dowel pins fit into to clean them up and make them slightly larger.


A recent Gallup public opinion poll shows the NRA, at 58% approval, has a higher approval rating than either Hillary Clinton or Barack Obama.

Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ...

Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.
CJ7-Tim is offline  
post #5 of 7 Old 07-25-2013, 05:21 PM
Registered User
1999 XJ Cherokee 
Join Date: Dec 2011
Location: Murray
Posts: 216
I just recently changed my cracked manifold, I got everything together and it immediately red lined when I started her up.

I took off the intake and tried putting it on again, and that fixed my issue.
Glavus is offline  
post #6 of 7 Old 07-25-2013, 06:23 PM Thread Starter
Registered User
1999 FSJ Cherokee 
Join Date: Jul 2013
Location: murfreesboro
Posts: 7
Thanks guys. I looked some more with a mirror and found the pins were not lined up. Got them lined up now and just snug. Will finish tomorrow and let you know how it goes.
sreilly1 is offline  
post #7 of 7 Old 07-27-2013, 11:07 AM Thread Starter
Registered User
1999 FSJ Cherokee 
Join Date: Jul 2013
Location: murfreesboro
Posts: 7
Amazing what happens when get the pins lined up. Hour or so to get it together but its done and working perfect. Thanks again.
sreilly1 is offline  

exhaust , idle , intake , manifold , timing

Quick Reply

Register Now

In order to be able to post messages on the 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