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XJ Ask the Question Thread
☠ CF Sheriff ☠
Joined: Nov 2009
Posts: 15,197
Likes: 18
From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
I need a new engine as mine has compression issues and doesn't have the power like it should. It runs great but when I'm traveling at 50+ mph, and start to go up a hill, my Jeep slows way down and I have to goose it to get it to shift into a lower gear to regain speed.
My question is, I'm thinking about looking for a newer engine from like a 96 or 98, something from there with less mileage and I was wondering, what all will I have to do to make the swap? I know you need to change the computers, but else is there to it? Of course I need all my gauges to work and everything else. I have an '88 Renix 4.0. Would it just be better to find another Renix 4.0 and swap that in instead of going through all the pain of swapping in a Chrysler 4.0?
My question is, I'm thinking about looking for a newer engine from like a 96 or 98, something from there with less mileage and I was wondering, what all will I have to do to make the swap? I know you need to change the computers, but else is there to it? Of course I need all my gauges to work and everything else. I have an '88 Renix 4.0. Would it just be better to find another Renix 4.0 and swap that in instead of going through all the pain of swapping in a Chrysler 4.0?
From the newer XJ (91-99):
Block
Head
Exhaust manifold and downpipe
Intake manifold
Cooling System (or convert your Renix system to open)
Throttle Body
PS pump bracket
Fuel Injectors and Fuel Rail
partial fuel lines (engine side)??
From your Renix XJ: (Swap to new engine)
All sensors, including the TPS & Renix Distributor
Exhaust system (cat back)
all engine accessories, brackets (except PS bracket)
Flywheel (VERY important - matches Renix CPS indexing)
Partial fuel lines (tank side)??
The biggest snag with this swap is usually adapting the Renix TPS to the H.O. Throttle Body, but there's quite a few guides floating around for that.
More info here: http://www.comancheclub.com/forums/v...=27947&start=0
Last edited by dukie564; Nov 3, 2011 at 03:11 PM.
CF Veteran
Joined: Sep 2010
Posts: 12,692
Likes: 6
From: Mercer County, NJ
Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
Originally Posted by dukie564
Been done before - not too terrible if you know what parts to keep, which parts to swap. Don't change the computer - just use the Renix computer and sensors with the new block/head.
From the newer XJ (91-99):
Block
Head
Exhaust manifold and downpipe
Intake manifold
Cooling System (or convert your Renix system to open)
Throttle Body
PS pump bracket
Fuel Injectors and Fuel Rail
partial fuel lines (engine side)??
From your Renix XJ: (Swap to new engine)
All sensors, including the TPS & Renix Distributor
Exhaust system (cat back)
all engine accessories, brackets (except PS bracket)
Flywheel (VERY important - matches Renix CPS indexing)
Partial fuel lines (tank side)??
The biggest snag with this swap is usually adapting the Renix TPS to the H.O. Throttle Body, but there's quite a few guides floating around for that.
More info here: http://www.comancheclub.com/forums/v...=27947&start=0
CF Veteran
Joined: Apr 2011
Posts: 1,146
Likes: 0
From: Clayton, NC
Year: 1988
Model: Cherokee
Engine: 4.6L I6 Stroker with port matched +99 intake and 62mm TB
Newbie
Joined: Oct 2011
Posts: 6
Likes: 0
Year: 1995
Model: Cherokee
Engine: 242 CID (HO)
Does anyone know the name of this part? It's a threaded insert on the intake manifold that has a vertical and horizontal adapters for vacuum hoses. One goes to the fuel pressure regulator and the other goes back into the firewall to somewhere. I busted off the horizontal adapter and I'm trying to find a replacement.
Junior Member
Joined: May 2010
Posts: 57
Likes: 0
From: Las Vegas, NV
Year: 96
Model: Cherokee
Engine: 4 Popper
start and stop
When I start the Jeep up in the morning it starts up and runs for about 3 seconds then shuts off and then i have to start it again and it stays running? Any one ever heard of this?
CF Veteran
Joined: Nov 2010
Posts: 15,581
Likes: 8
From: some small town oregon
Year: 1989
Model: Cherokee
Engine: 4.0
Originally Posted by Grantham
Does anyone know the name of this part? It's a threaded insert on the intake manifold that has a vertical and horizontal adapters for vacuum hoses. One goes to the fuel pressure regulator and the other goes back into the firewall to somewhere. I busted off the horizontal adapter and I'm trying to find a replacement.
Registered Users
Joined: Feb 2011
Posts: 764
Likes: 0
From: Baltimore, Maryland
Year: 1989
Model: Cherokee
Engine: Inline 6
...with all the work i'm having to do to Anya to get her back on the road, i'm likely to be the next Dukie...LOL. and both from the big MD...how epic.
☠ CF Sheriff ☠
Joined: Nov 2009
Posts: 15,197
Likes: 18
From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
☠ CF Sheriff ☠
Joined: Nov 2009
Posts: 15,197
Likes: 18
From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
Your anti-drainback/return check valve in the fuel pump assembly is probably gummed up. Try turning the key to on to prime the pump for 3 seconds or so before trying to start it.
☠ CF Sheriff ☠
Joined: Nov 2009
Posts: 15,197
Likes: 18
From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
Does anyone know the name of this part? It's a threaded insert on the intake manifold that has a vertical and horizontal adapters for vacuum hoses. One goes to the fuel pressure regulator and the other goes back into the firewall to somewhere. I busted off the horizontal adapter and I'm trying to find a replacement.
But there are lots of 4.0L engines in junkyards!