Replaced exhaust manifold, when started revs to max rpm -
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > Replaced exhaust manifold, when started revs to max rpm

Yeti Paracord Handles are in at JeepHut.comPANDEMIC-USA 50" SINGLE ROW light bars!! **On sale noRough Country Suspensio Get the Best Deals Here...

Unread 11-20-2010, 12:08 AM   #1
Registered User
1998 TJ Wrangler 
Join Date: Nov 2010
Location: Ewa Beach, HI
Posts: 1
Replaced exhaust manifold, when started revs to max rpm

I replaced my exhaust manifold. After putting everything back, when I went to start it the engines rpms rev extremely high and will keep going if I let it.
I have checked for vacuum leaks there were none, replaced IAC and MAP sensor, which didn't make a difference. I have read over other threads with similar problems, but they only had responses involving vacuum leaks.
And now I am running out of ideas.

dmp362 is offline   Reply With Quote Quick reply to this message
Unread 11-20-2010, 12:19 AM   #2
Registered User
1998 XJ Cherokee 
Join Date: Jul 2008
Location: pittsburgh, PENNSYLVANIA
Posts: 291
you have an intake leak somewhere. most likely you dont have the intake sealed against the head properly. which is a vacuum leak. double check to see if your sealed against the head or see if you possibly cracked the manifold when installing it. i changed my exhaust manifold and i had a tough time getting the manifold back on the dowel pins. pull the intake off again get a file and LIGHTLY scuff out the dowel holes on the manifold. basically pull the manifold off and double check everything you did that should reveal the issue causing the WOT condition.
Heap-O-Jeep is offline   Reply With Quote Quick reply to this message
Unread 11-21-2010, 06:26 PM   #3
Registered User
1976 CJ7 
Join Date: Feb 2010
Location: minnesota
Posts: 46
same thing happend to a friend when he rebuilt his engine. the dowel pins didnt seat all the way. he said the power steering pump was hard to line up with the intake not seated on the head.
mnstretch is offline   Reply With Quote Quick reply to this message
Unread 11-21-2010, 08:52 PM   #4
Registered User
2000 TJ Wrangler 
Join Date: Nov 2008
Location: Baltimore, Maryland
Posts: 1,018
vaccume leak between the intake manifold and the cylinder head. spray some throttle body cleaner around the area of the gasket and if you have a leak the engine will suck in the vapor and engine speed will increase at a noticeable rate. try touquing down your intake manifold bolts again.
Associates Degree in automotive technology
epeck87 is offline   Reply With Quote Quick reply to this message

idle issue , idle problems , idle too high , idles rough

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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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.

Thread Tools

Suggested Threads

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. is not in any way associated with Jeep or the Chrysler Corp.