Injector Swap Writeup for the 4.0L - Page 7 - JeepForum.com
Search  
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 JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > Injector Swap Writeup for the 4.0L

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineGrizzly Lockers available at Rockridge4wd.comThe ULTIMATE "Selectable" Locker System! Brough

Reply
Unread 10-02-2012, 12:59 PM   #91
dukie564
Registered User
1995 XJ Cherokee 
 
Join Date: Jun 2008
Location: Hanover, MD, Maryland
Posts: 2,741
no not worth it. People on here or cherokeeforum sell them for like $80 for 6 rebuilt, cleaned, and tested.

__________________
1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
dukie564 is offline   Reply With Quote Quick reply to this message
Unread 10-02-2012, 02:15 PM   #92
AmbuGrl
Web Wheeler
 
AmbuGrl's Avatar
1998 XJ Cherokee 
 
Join Date: Oct 2009
Location: Virginia Beach, Va
Posts: 2,403
Hellz no would I pay what you saw on ebay. I paid $70 shipped for mine.
__________________
- HM1(SW/AW)Ret USN Dec 23,1992 to Dec 31, 2012

I drive an XJ, and all of my power windows work :)



2000 Pontiac WS6 - DD
DD (Mine) Sold - 98 XJ Moss Green
(His) - 92 YJ December 2013 YJOTM

Sold - 95 ZJ
Sold - 97 XJ Red
Sold - 98 XJ


USN Jeep Club Hull #36
NAXJA #3700

Quote:
Originally Posted by RacerX View Post
WTF is Clockspring??? my Jeep has digital clock
AmbuGrl is offline   Reply With Quote Quick reply to this message
Unread 10-02-2012, 09:20 PM   #93
64tbird
Registered User
 
Join Date: Sep 2012
Posts: 38
Where can you get them cleaned and tested/flow tested?
64tbird is offline   Reply With Quote Quick reply to this message
Unread 10-02-2012, 11:22 PM   #94
GetLifted
Registered User
1996 XJ Cherokee 
 
Join Date: Mar 2010
Location: SoCal
Posts: 1,196
I got mine cleaned rebuilt and flow matched for 90 shipped with a warranty from ebay seller injectordyne
GetLifted is offline   Reply With Quote Quick reply to this message
Unread 10-10-2012, 10:04 PM   #95
RedRyderXJ
Registered User
1994 XJ Cherokee 
 
Join Date: Dec 2011
Location: Carrollton, GA
Posts: 609
Got mine for $45 from x91j when he did it on CF
RedRyderXJ is offline   Reply With Quote Quick reply to this message
Unread 11-24-2012, 10:55 AM   #96
Lubetich
Registered User
1991 XJ Cherokee 
 
Join Date: Nov 2012
Location: Killeen, Tx
Posts: 1
Got mine from the jy, $28 for all 6! Is it normal for a little bit of white smoke to come from the injector area at first? Is that the "Running Rich" You speak of?
Lubetich is offline   Reply With Quote Quick reply to this message
Unread 11-24-2012, 02:57 PM   #97
bigbadduck
Registered User
1987 XJ Cherokee 
 
Join Date: Sep 2012
Posts: 83
Really cool write up
bigbadduck is offline   Reply With Quote Quick reply to this message
Unread 02-19-2013, 08:13 AM   #98
jmiera
Registered User
2000 XJ Cherokee 
 
Join Date: Sep 2009
Location: Thornton, Colorado
Posts: 79
great write up !!
jmiera is offline   Reply With Quote Quick reply to this message
Unread 02-19-2013, 08:43 AM   #99
robinz
Registered User
1990 XJ Cherokee 
 
Join Date: Nov 2007
Location: edmonton, alberta, canada
Posts: 19
Quote:
Originally Posted by 64tbird View Post
Did you need resistors to run the 3.7l injectors? And which wire to which wire when you rewired to run them? I got a set from a 02 and they have been soaking in seafoam for months lol. I forgot about them
Sorry about this late response, I was never notified. No resistors required and wire-to-wire does not matter.
__________________
1990 XJ 4.0L I6
robinz is offline   Reply With Quote Quick reply to this message
Unread 04-06-2013, 04:22 PM   #100
DunmerBoy
eXJpedition
 
DunmerBoy's Avatar
1998 XJ Cherokee 
 
Join Date: Jul 2012
Location: Tucson, Arizona
Posts: 3,123
awesome job with this write up! i did it this morning and couldnt have nearly as easily without it
__________________
Quote:
Originally Posted by VegasGT View Post
We are a group of individuals that worship a box shaped unibody that's been out of production for over 13 years. There's no shame to be had here. :D
- Build Thread -
DunmerBoy is offline   Reply With Quote Quick reply to this message
Unread 04-08-2013, 12:30 PM   #101
dukie564
Registered User
1995 XJ Cherokee 
 
Join Date: Jun 2008
Location: Hanover, MD, Maryland
Posts: 2,741
Glad I could help!
__________________
1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
dukie564 is offline   Reply With Quote Quick reply to this message
Unread 04-14-2013, 05:13 AM   #102
jeep795
Registered User
1992 YJ Wrangler 
 
Join Date: Jun 2005
Location: warren, ma
Posts: 1,024
looking at a few of the injector sites, not every injector has the flow rates listed and at what pressure. I always hear to use the ford blue tops, or the four hole siemens... Now neon and libby injectors?? Hard to chose. Is there a list, in order of flow rate/pressure showing the injectors that will fit on a 4.0 rail and what modifications might have to fit for optimum performance on both a single rail and double/return.

some of the links don't show what the original intention was any more. Any chance some of those could be updated? And ya know, I'd really like to hear from some of the stroker guys about what injectors they've used and had success with.
__________________
"my jeep is pretty much my wife. it gets most of my time, and it loves when i spend money on it."
jeep795 is offline   Reply With Quote Quick reply to this message
Unread 04-15-2013, 08:51 AM   #103
dukie564
Registered User
1995 XJ Cherokee 
 
Join Date: Jun 2008
Location: Hanover, MD, Maryland
Posts: 2,741
not sure what links are broken - I just checked and all mine look fine. There is no "list" beyond the image I posted on the first page showing application by year.

Anyways here's a few links for reading up and to give more information:
http://www.ausjeepoffroad.com/forum/...ad.php?t=92236
http://www.cherokeeforum.com/f2/more...48/#post173704
http://www.fuelinjector.citymaker.co...low_Rates.html
Converter: http://www.witchhunter.com/injectorcalc1.php


For Reference:
The stock injectors for Renix flow 240cc, HO flow 248cc (up to 95-OBD1) and 234cc (96- up OBDII). However, the Renix and OBDI flow at 39PSI and the later OBDII ('96 onwards) flow at 49PSI.

Injector flow is always measured at 3 Bar, 43.5PSI. This is a reference point and from this you can calculate the flow to your system working pressure.

Injector size (lb/hr) = (horsepower x 0.5)/(no.of cylinders x 0.8 )
So say you have a 250 horse I6...
125/4.8=26 lb/hr injector
So for a 30 lb/hr injector, you would need about a 290 horse motor to utilize them.
Cherokees from 93 on made around 190hp stock= 19.8 lb injectors according to the above formula
The 24lb injectors should be good for some 230hp.
__________________
1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
dukie564 is offline   Reply With Quote Quick reply to this message
Unread 04-16-2013, 01:17 AM   #104
Project1
Registered User
1998 XJ Cherokee 
 
Join Date: Feb 2010
Location: Florida
Posts: 2,716
Quote:
Originally Posted by dukie564 View Post
Step 15 - Time to lube up! Grab your petroleum jelly, and lube up each o-ring, being careful to keep it away from the pintle holes.
Petroleum based lubes may erode the rubber o-rings and harden them, causing cracks or break apart.

silicone is a better bet really.
__________________
[ ]||||||[ ] ... http://www.jeepforum.com/forum/f11/98-green-xj-daily-driver-build-996260/
Project1 is offline   Reply With Quote Quick reply to this message
Unread 04-16-2013, 06:35 AM   #105
dukie564
Registered User
1995 XJ Cherokee 
 
Join Date: Jun 2008
Location: Hanover, MD, Maryland
Posts: 2,741
meh...2 years and zero issues. With the really small amount I used i'm not worried in the least.
__________________
1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
dukie564 is offline   Reply With Quote Quick reply to this message
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.
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:

Log-in

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. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.