The Definitive Injector Swap HOW TO - Page 4 - 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 Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > The Definitive Injector Swap HOW TO

JEEP Gear Change Packages From ROCKRIDGE 4WD. We Are DIFFAlloy usa heavy duty ball joint kitsROCKRIDGE4WD Introduces a NEW Jeep Wrangler JK *led* tail

Reply
Unread 02-20-2012, 09:28 AM   #46
AlphaLorde
Registered User
1998 ZJ 
 
Join Date: Jan 2010
Location: Forest Lake, MN
Posts: 714
Unless I am blind, what is the difference with the use the 14 ohm ford injector in our 12 ohm system?

__________________
1998 ZJ Laredo 5.2L 139k 231 w/SYE artec trussed 8.8 4.25"F/5"R lift
AlphaLorde is offline   Reply With Quote Quick reply to this message
Unread 02-22-2012, 07:14 AM   #47
augiedoggy
Registered User
 
Join Date: Feb 2012
Location: n tonawanda, ny
Posts: 47
the ohms load could effect how the computer control's the duty cycle (the timing and duration of fuel pulses) that being said there's a lot of people like Five-o selling injectors with completely wrong specs posted on there site and they seem to work...(the red ones he offered for 5.2 and 5.9 "upgrade actually tested over 16ohms with a meter) and the feul flow is much higher at the 49psi that the 5.2 and 5.9 use between 96 and 01...this causes most engines to run very rich with those injectors... in 94-95 they only used 39psi.. and different injectors.
I'm not sure what the fuel pressure is in the different jeeps but that matters a lot in fuel flow.. and the fuel sync should be readjusted to really take advantage of the gen 3 design... the guys I spoke to who did it said it made a huge difference... also the aluminum on the inside of the kegger of the magnum engines around the injector hole should in some cases be trimmed for the wider spray pattern of these 703 injectors...
augiedoggy is offline   Reply With Quote Quick reply to this message
Unread 02-22-2012, 09:27 AM   #48
AlphaLorde
Registered User
1998 ZJ 
 
Join Date: Jan 2010
Location: Forest Lake, MN
Posts: 714
I modded my kegger by cleaning up and smoothing out the runners and injector bosses.

I with that info of possibly too high of a fuel rate running the 715s, I think I will just stick with the Chrysler 703s. With the extra holes and slightly higher flow rates will work just fine for my mildly modded 5.2.
I need some mpgs (14 right now mix hwy/city) with this being a trail rig/family camping rig. Jumping the fuel rate up that much with the 715s would most likely drop my mpg numbers.
__________________
1998 ZJ Laredo 5.2L 139k 231 w/SYE artec trussed 8.8 4.25"F/5"R lift
AlphaLorde is offline   Reply With Quote Quick reply to this message
Unread 02-26-2012, 11:40 PM   #49
sebian
Registered User
1995 ZJ 
 
Join Date: Sep 2009
Location: Austin, TX
Posts: 1,332
I just tried the 703 injector swap in my 95 V8. All I got for my efforts was a massive cloud of white smoke.

I am guessing that I got a leaky injector or two, and they just dumped fuel into the combustion chamber. No external leaks or anything, and I did ohm them out prior to installing them. All were just a hair over 12 ohm. Put the old injectors back in, and within about 10 minutes the Jeep cleared back up.
__________________
1995 ZJ 5.2L V8 318. 220,000 miles and still rollin.

List of parts not replaced yet:
...
sebian is offline   Reply With Quote Quick reply to this message
Unread 02-26-2012, 11:44 PM   #50
bananaslug
Registered User
1996 ZJ 
 
Join Date: Nov 2011
Location: upland, ca
Posts: 1,452
Did mine a few days ago and my Jeep seems happier. Didn't disco the fuel line. Thanks for the writeup!
bananaslug is offline   Reply With Quote Quick reply to this message
Unread 02-27-2012, 08:19 AM   #51
AlphaLorde
Registered User
1998 ZJ 
 
Join Date: Jan 2010
Location: Forest Lake, MN
Posts: 714
Quote:
Originally Posted by sebian View Post
I just tried the 703 injector swap in my 95 V8. All I got for my efforts was a massive cloud of white smoke.

I am guessing that I got a leaky injector or two, and they just dumped fuel into the combustion chamber. No external leaks or anything, and I did ohm them out prior to installing them. All were just a hair over 12 ohm. Put the old injectors back in, and within about 10 minutes the Jeep cleared back up.
I haven't done this yet, but did you do clean and rebuild the injectors before installing? I saw in the write up to use this kit.
__________________
1998 ZJ Laredo 5.2L 139k 231 w/SYE artec trussed 8.8 4.25"F/5"R lift
AlphaLorde is offline   Reply With Quote Quick reply to this message
Unread 02-27-2012, 08:52 AM   #52
bananaslug
Registered User
1996 ZJ 
 
Join Date: Nov 2011
Location: upland, ca
Posts: 1,452
Quote:
Originally Posted by z71tbi

I haven't done this yet, but did you do clean and rebuild the injectors before installing? I saw in the write up to use this kit.
I did
bananaslug is offline   Reply With Quote Quick reply to this message
Unread 02-27-2012, 09:15 AM   #53
sebian
Registered User
1995 ZJ 
 
Join Date: Sep 2009
Location: Austin, TX
Posts: 1,332
Yes I did. I soaked them for a couple hours in Seafoam, then used a toothbrush to scrub them. After cleaning, I used that kit to rebuild them.
__________________
1995 ZJ 5.2L V8 318. 220,000 miles and still rollin.

List of parts not replaced yet:
...
sebian is offline   Reply With Quote Quick reply to this message
Unread 02-28-2012, 05:11 AM   #54
augiedoggy
Registered User
 
Join Date: Feb 2012
Location: n tonawanda, ny
Posts: 47
Quote:
Originally Posted by sebian
I just tried the 703 injector swap in my 95 V8. All I got for my efforts was a massive cloud of white smoke.

I am guessing that I got a leaky injector or two, and they just dumped fuel into the combustion chamber. No external leaks or anything, and I did ohm them out prior to installing them. All were just a hair over 12 ohm. Put the old injectors back in, and within about 10 minutes the Jeep cleared back up.
I don't know for sure about the magnums in Jeeps but I do know the 5.2 and 5.9 liters in the 94-95 dodges used different injectors and less (39 vs49psi) fuel pressure which effects flow.
augiedoggy is offline   Reply With Quote Quick reply to this message
Unread 02-28-2012, 06:59 AM   #55
elkski
Registered User
1993 ZJ 
 
Join Date: Feb 2012
Location: Sandy, Utah
Posts: 64
Clean for normal parts is not clean for a micro small orifice part like injectors must be inside. I have my 703's to clean still and parts kit on the way. I plan to clean the outside gunk off first using rubber gloves to cover both ends. This will get the outsides clean and then all cleaning fluid from then on will be new and I will think super clean like a wafer fab clean room. I hope they work for me. Kinda a fun 100$ project. 7$ each x8 at JY and 15$ for the kit. I hear the 703 usually have a flow within 5% of each other and rarely are found to be bad.
elkski is offline   Reply With Quote Quick reply to this message
Unread 02-28-2012, 09:29 AM   #56
sebian
Registered User
1995 ZJ 
 
Join Date: Sep 2009
Location: Austin, TX
Posts: 1,332
Quote:
Originally Posted by augiedoggy View Post
I don't know for sure about the magnums in Jeeps but I do know the 5.2 and 5.9 liters in the 94-95 dodges used different injectors and less (39 vs49psi) fuel pressure which effects flow.
That was my other thought to, that the flow rate might be too high, and my PCM was not able to compensate for the higher flow, resulting in an extremely rich running condition.
__________________
1995 ZJ 5.2L V8 318. 220,000 miles and still rollin.

List of parts not replaced yet:
...
sebian is offline   Reply With Quote Quick reply to this message
Unread 02-28-2012, 10:17 AM   #57
AlphaLorde
Registered User
1998 ZJ 
 
Join Date: Jan 2010
Location: Forest Lake, MN
Posts: 714
Quote:
Originally Posted by sebian View Post
That was my other thought to, that the flow rate might be too high, and my PCM was not able to compensate for the higher flow, resulting in an extremely rich running condition.
Are you saying it would be too rich for the 95+ w/ 49psi or too rich for the 93-94 w/ 39 psi.

The 703s run 22lbs or so at 42psi so I need help interpreting this info...
I wanna run em on my 94, just trying to get as much info as I can
__________________
1998 ZJ Laredo 5.2L 139k 231 w/SYE artec trussed 8.8 4.25"F/5"R lift
AlphaLorde is offline   Reply With Quote Quick reply to this message
Unread 02-28-2012, 01:35 PM   #58
General_Jeep
Registered User
1994 ZJ 
 
Join Date: Mar 2011
Location: Arvada, Colorado
Posts: 434
I believe they will work for the 94 since the PSI is lower than a 96+ you should have a slightly lower rating with the 703's maybe 21.5?
__________________
1994 Jeep Grand Cherokee 5.2L V8- NV3500 - Blown D35 8.8 replacement some day.
2010 Jeep Patriot 5 speed manual-- DD, 27-31MPG :D
1996 Dodge Ram 1500 - Work Truck/Plow 5.2L NV3500
2005 Nissan Titan - Hauler

"The Jeep is Americas only real sports car!" - Enzo Ferrari
General_Jeep is offline   Reply With Quote Quick reply to this message
Unread 02-28-2012, 05:19 PM   #59
AlphaLorde
Registered User
1998 ZJ 
 
Join Date: Jan 2010
Location: Forest Lake, MN
Posts: 714
With less fuel flowing would help my mpgs but I would have less power then...
Well doesn't sound like this is beneficial for us 93-94 crowd, unless someone can elaborate some more
__________________
1998 ZJ Laredo 5.2L 139k 231 w/SYE artec trussed 8.8 4.25"F/5"R lift
AlphaLorde is offline   Reply With Quote Quick reply to this message
Unread 02-28-2012, 06:05 PM   #60
elkski
Registered User
1993 ZJ 
 
Join Date: Feb 2012
Location: Sandy, Utah
Posts: 64
Quote:
Originally Posted by z71tbi View Post
With less fuel flowing would help my mpgs but I would have less power then...
Well doesn't sound like this is beneficial for us 93-94 crowd, unless someone can elaborate some more
It doesn't work this way... The injector on off times (=duty cycles) are varied by the electronics that use the Upstream and downstream O2 sensors as well as possibly various other data to run the correct fuel to air mixture.
I have my 703s to install once the kits comes in for my 93 5.2.
The main benefit is maybe better atomization and thus cleaner burning which might raise the mileage a tiny amount most likely not measurable.
Some claim to have better pep. I am doing it because I might have a leaky injector.
As far as 12 vs 14 ohm...check out ohms law... lower ohms means higher current for a certain voltage.
http://en.wikipedia.org/wiki/Ohm%27s_law
elkski is offline   Reply With Quote Quick reply to this message
Reply

Tags
703 , 715 , ford , fuel injector , neon , swap

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.