APN exhaust manifold
#1
Newbie
Thread Starter
Join Date: May 2013
Location: Florida
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
APN exhaust manifold
Ok guys...tech question. I put on my new APN exhaust manifold on my 4.0 tonight. Went on great with no problems. After finishing up I went to fire the jeep and the RPMs shot to red line. Had to shut it off to stop the motor from blowing up! Checked all the bolts/electrical plugs and they are good. So I'm stumped and need help!
#3
Senior Member
Join Date: Sep 2012
Location: Largo, FL
Posts: 509
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1995
Model: Cherokee
Engine: 4.0 HO
Ok guys...tech question. I put on my new APN exhaust manifold on my 4.0 tonight. Went on great with no problems. After finishing up I went to fire the jeep and the RPMs shot to red line. Had to shut it off to stop the motor from blowing up! Checked all the bolts/electrical plugs and they are good. So I'm stumped and need help!
#5
CF Veteran
Join Date: Nov 2011
Location: SLC, Utah
Posts: 3,603
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1999
Model: Cherokee
Engine: 4.0L
Seeing that you have a 99 you need to grind down the bottom of the #1and #6 intake runners. The intake is not seated properly thus creating a vaccum leak.
I have read About that issue a bunch on the 99's. I'll let you know how my install goes tomorrow when I get my APN Header on my 99
I have read About that issue a bunch on the 99's. I'll let you know how my install goes tomorrow when I get my APN Header on my 99
Trending Topics
#12
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,874
Received 1,526 Likes
on
1,238 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Here's where you have to grind down a REnix intake when installing a header.
Keep in mind the manifold is upside down on the bench.
Keep in mind the manifold is upside down on the bench.
#15
CF Veteran
Join Date: Nov 2011
Location: SLC, Utah
Posts: 3,603
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1999
Model: Cherokee
Engine: 4.0L
My buddy just texted me that my header install is finished and it went on flawlessly. He did not have to grind anything. My XJ's build date is 6/99 so its a late 99 build