The Definitive Injector Swap HOW TO - Page 26 - JeepForum.com
Reply
 
LinkBack Thread Tools
post #376 of 675 Old 02-27-2013, 07:16 PM
xcaliber81
Registered User
1994 ZJ 
 
Join Date: Jul 2012
Location: Prince George
Posts: 3,760
Quote:
Originally Posted by zander21510 View Post
I'm guessing you mean 703s? As far as I know, only the cars listed contain 703s
yea i meant 703 sorry. Alright thanks.

xcaliber81 is offline  
Sponsored Links
Advertisement
 
post #377 of 675 Old 02-28-2013, 04:18 PM
tetatdo
Registered User
1994 ZJ 
 
Join Date: Aug 2003
Location: Pasadena, CA
Posts: 178
So I got the flow matched reman 703 injectors from ebay, very quick shipping and very nicely packaged.

Some observations:

When I pulled the old factory ones out of the jeep, I noticed a TON of gunk on each of the injector ports, just seemed like a bunch of varnish all over the port and inside. I cleaned it all out. Installation was a snap, Ive done it a bunch of times before so no big deal.

I previously had the WJ injectors with the LH car FPR, (I had switched back to the original factory injectors with the LH FPR for smogging purposes) which runs at 41-49 psi on the older jeeps. So I put the 703's in, started it up and it must have been too rich because it was running like absolute crap, I mean almost stalling out. The exhaust smelled pig rich and I couldnt really even rev it.

So I took off the LH FPR and put on the stock FPR which lowered the pressure to 31-39psi... It started right up, and idles SUPER SMOOTH now!! Seems to be eager to rev, idles a bit higher now and I barely have to touch the accelerator to start out, feels way more torquey and on the fwy all I need is a tiny millimeter of throttle input to cruise. At WOT it seems to pull very nicely after 2500 rpm (still have a flat spot from 1800 to 2500 rpm) but after that it's nicely powered.

All in all seems like a very worthy upgrade, but if you're running a higher fuel pressure it will be way too rich.
tetatdo is offline  
post #378 of 675 Old 02-28-2013, 08:14 PM
coralman
USER OF PARTS CATALOGS
 
coralman's Avatar
1998 ZJ 
 
Join Date: Jul 2010
Location: florida
Posts: 7,068
Interesting observations. On 96-98 models, plenty of people have run the 703's at the higher pressure without a problem. Some have noticed a rich smell at WOT, but I haven't read of any running rich at idle. Not an expert at all, just wondering why the difference.

Info on projects and repairs categorized by system
http://www.jeepforum.com/forum/f13/c...-faqs-2863665/

Originally Posted by HighLonesome
lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
coralman is offline  
post #379 of 675 Old 02-28-2013, 11:14 PM Thread Starter
zander21510
Registered User
1995 ZJ 
 
Join Date: Jun 2011
Location: Dallas
Posts: 2,139
Quote:
Originally Posted by coralman
Interesting observations. On 96-98 models, plenty of people have run the 703's at the higher pressure without a problem. Some have noticed a rich smell at WOT, but I haven't read of any running rich at idle. Not an expert at all, just wondering why the difference.
93-95 ran at 39psi 96-98 ran at 49... Perhaps difference in the computer?
zander21510 is offline  
post #380 of 675 Old 03-01-2013, 12:31 AM
Uniblurb
Web Wheeler
 
Uniblurb's Avatar
1996 ZJ 
 
Join Date: Jan 2012
Location: Central
Posts: 6,722
When I first installed the 703's on my 96 4.0 with 49psi it ran like crap, too rich, and idle going up/down with it all over the board. In disconnecting the neg battery cable to reset the PCM it made no difference. Was pretty disappointed and thought I made a mistake.

Then someone told me to drive it for a while to see if it will adjust. Great tip and within a week everything was running real smooth with a little more power to boot. Not sure why it took 50-100 miles to adjust but it did and now I'm real happy with them. The 703's sure seem to click a lot louder than the OE's but if it's running good I don't mind.
Uniblurb is offline  
post #381 of 675 Old 03-01-2013, 11:47 AM
tetatdo
Registered User
1994 ZJ 
 
Join Date: Aug 2003
Location: Pasadena, CA
Posts: 178
Quote:
Originally Posted by Uniblurb View Post
When I first installed the 703's on my 96 4.0 with 49psi it ran like crap, too rich, and idle going up/down with it all over the board. In disconnecting the neg battery cable to reset the PCM it made no difference. Was pretty disappointed and thought I made a mistake.

Then someone told me to drive it for a while to see if it will adjust. Great tip and within a week everything was running real smooth with a little more power to boot. Not sure why it took 50-100 miles to adjust but it did and now I'm real happy with them. The 703's sure seem to click a lot louder than the OE's but if it's running good I don't mind.
Yeah I dont think the OBDI jeeps will adjust like that... I could barely get it out of the driveway... Runs great at the lower pressure though
tetatdo is offline  
post #382 of 675 Old 03-01-2013, 01:05 PM
Uniblurb
Web Wheeler
 
Uniblurb's Avatar
1996 ZJ 
 
Join Date: Jan 2012
Location: Central
Posts: 6,722
Quote:
Originally Posted by tetatdo View Post
Yeah I dont think the OBDI jeeps will adjust like that... I could barely get it out of the driveway... Runs great at the lower pressure though
Yeah, kind of hard to understand the OBDI ECU/ECM vs OBDII PCM's and don't know if the later models are better at learning or what's going on? I had read it's best to drive over 50mph for a while when 1st installing the 703's and believe that's what helped everything come into sync on my 96 4.0 49psi.
Uniblurb is offline  
post #383 of 675 Old 03-01-2013, 03:27 PM
coralman
USER OF PARTS CATALOGS
 
coralman's Avatar
1998 ZJ 
 
Join Date: Jul 2010
Location: florida
Posts: 7,068
I wouldn't let it run rich for too long, its not just set it and forget it. I worry about the cat. I actually like torchd's set up on the exhaust just gotta find a wizard in my town.

Info on projects and repairs categorized by system
http://www.jeepforum.com/forum/f13/c...-faqs-2863665/

Originally Posted by HighLonesome
lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
coralman is offline  
post #384 of 675 Old 03-02-2013, 02:25 AM
Uniblurb
Web Wheeler
 
Uniblurb's Avatar
1996 ZJ 
 
Join Date: Jan 2012
Location: Central
Posts: 6,722
While maybe "it's not a set and forget" situation I don't know what you can do if it's running too rich as first with 703's since there's no adjusting? And I wasn't about to put my OE 195K mile injectors back in when they're bleeding off/leaking while causing missing.

But I'd have to agree coralman and I also worry about my cat which is only about a year old. I just hope I didn't partially clog it when I had a bad intake leak for a very short time before I fixed it.
Uniblurb is offline  
post #385 of 675 Old 03-02-2013, 04:46 AM
coralman
USER OF PARTS CATALOGS
 
coralman's Avatar
1998 ZJ 
 
Join Date: Jul 2010
Location: florida
Posts: 7,068
I was just thinking out loud. My exhaust is junk, so most likely I will wait to replace it until after the swap.

Info on projects and repairs categorized by system
http://www.jeepforum.com/forum/f13/c...-faqs-2863665/

Originally Posted by HighLonesome
lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
coralman is offline  
post #386 of 675 Old 03-02-2013, 07:59 AM
torchd
Registered User
1998 ZJ 
 
Join Date: Jan 2010
Location: Chicago
Posts: 2,593
I still haven't been added to the list lol.


I have the new 4.0 manifold, 703 injectors and a header. Jeep runs perfect

Sent from my iPhone using JeepForum

1998 Jeep Grand Cherokee Laredo
2" BB Pucks | SkyJacker Hydro Shocks | Rubicon Wheels | Cooper 245/75/16 Tires

2002 Trans Am
Cam, Full Exhaust, Stock Heads, Stock LS6 Intake and Stock 10 bolt with 3.42s
420 RWHP and 382 RWHTQ
torchd is offline  
post #387 of 675 Old 03-02-2013, 03:20 PM
coralman
USER OF PARTS CATALOGS
 
coralman's Avatar
1998 ZJ 
 
Join Date: Jul 2010
Location: florida
Posts: 7,068
Torchd, I need some good pics of your front pipe, including where it attaches to the header, so I can say"see like this" to the exhaust dudes.

Info on projects and repairs categorized by system
http://www.jeepforum.com/forum/f13/c...-faqs-2863665/

Originally Posted by HighLonesome
lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
coralman is offline  
post #388 of 675 Old 03-02-2013, 03:30 PM
xcaliber81
Registered User
1994 ZJ 
 
Join Date: Jul 2012
Location: Prince George
Posts: 3,760
So me having a 94 the 703's probably won't work then?
xcaliber81 is offline  
post #389 of 675 Old 03-02-2013, 04:56 PM
Uniblurb
Web Wheeler
 
Uniblurb's Avatar
1996 ZJ 
 
Join Date: Jan 2012
Location: Central
Posts: 6,722
Quote:
Originally Posted by xcaliber81 View Post
So me having a 94 the 703's probably won't work then?
Not necessarily true since if you look back at the first post in this thread (towards the middle) it's confirmed for some users the 703's work for 93-95 with the 39psi system. In fact that's what zander21510 w/95 4.0 who created this thread is running.

http://www.jeepforum.com/forum/f13/d...p-how-1305456/
Uniblurb is offline  
post #390 of 675 Old 03-02-2013, 05:06 PM
xcaliber81
Registered User
1994 ZJ 
 
Join Date: Jul 2012
Location: Prince George
Posts: 3,760
Quote:
Originally Posted by Uniblurb View Post
Not necessarily true since if you look back at the first post in this thread (towards the middle) it's confirmed for some users the 703's work for 93-95 with the 39psi system. In fact that's what zander21510 w/95 4.0 who created this thread is running.

http://www.jeepforum.com/forum/f13/d...p-how-1305456/
Yay so there is still some hope left lol.
xcaliber81 is offline  
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.



Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
1998 zj 5.2 fuel injector swap 1SASjeepster ZJ Grand Cherokee Forum 7 12-28-2011 06:17 PM
Injector swap? ZJPRKID ZJ Grand Cherokee Forum 24 11-20-2011 04:59 PM
junkyard fuel injector swap and result karik ZJ Grand Cherokee Forum 27 07-30-2011 06:10 PM
Fuel injector swap? airwolf9090 ZJ Grand Cherokee Forum 6 06-10-2011 05:46 AM
injector swap madhappy401 ZJ Grand Cherokee Forum 0 02-17-2010 05:28 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome