784 upgrade fuel injectors
Thread Starter
CF Veteran
Joined: Jan 2009
Posts: 1,964
Likes: 6
From: Baltimore, Maryland
Year: 1994 1993
Model: Cherokee
Engine: 4.0
Who knows what they all came out of.. Cirrus.. Sebring.. Neon.. Stratus ..Breeze .. Caravans. They all had the same 2.0 or 2.4 engines in them. $60 shipped anywhere in the 48 states
Junior Member
Joined: Jun 2011
Posts: 63
Likes: 0
Model: Cherokee
i am replying for a friend to this. 1 do you have anymore? and two are these injectors also a direct swap for the grand cherokees 4 liter? my buddy has a 00 wj and is considering these injectors it would be the 784s right?
Thread Starter
CF Veteran
Joined: Jan 2009
Posts: 1,964
Likes: 6
From: Baltimore, Maryland
Year: 1994 1993
Model: Cherokee
Engine: 4.0
Hello. Yes I have more. All the 99+ Jeep 4.0's use the same fuel injector so these will be a direct swap out with the 784's.
Senior Member
Joined: Mar 2011
Posts: 590
Likes: 0
From: Sykesville, MD
Year: 1990
Model: Cherokee
Engine: 4.0 L
I'm from carroll county maryland, cold you PM me a price if I were to swing by and grab some for a 90. I'll be putting them in with the 93 engine im about to swap in though. 784s preferably.
Junior Member
Joined: Feb 2011
Posts: 65
Likes: 0
From: Billings, MT
Year: 2001
Model: Cherokee
Engine: 4.0
Junior Member
Joined: May 2011
Posts: 41
Likes: 0
From: Merritt Island Florida
Year: 2000
Model: Cherokee
Engine: 4.0
With an '89 you could use either the 703's or 784's with the adpaters. They are bother the same injector body just with a different electrical connector on the side. The '89 doesnt have the problem later models have with the throttle cable bracket getting in the way of the 3rd adapter. So 703's would be the same EV-1 plug you have where-as the 784's require an adapter which means 1 additional connection point however you'd get a newer and possibly fresher injector.
And actually I have 703 & 784 (Neon), 715 & 789 (blue Ford higher flow), 849 (Green Dodge E-85 same as 784), 710 (Ford "yellow stick"), 048 (Stroker), and 923 (Cadillac injector basically the same as the 784 but from newer vehicles. I have a set of these in my personal XJ) and who knows how many other injector types here to sell
And actually I have 703 & 784 (Neon), 715 & 789 (blue Ford higher flow), 849 (Green Dodge E-85 same as 784), 710 (Ford "yellow stick"), 048 (Stroker), and 923 (Cadillac injector basically the same as the 784 but from newer vehicles. I have a set of these in my personal XJ) and who knows how many other injector types here to sell
Newbie
Joined: Mar 2010
Posts: 22
Likes: 0
From: Greencastle, Indiana
Year: 1999
Model: Cherokee
Engine: 4.0
do you need the clip nuts?
I bought the X2FE injectors off of fiveomotorsport.com and found that the place where the clipp nut attaches on the stock is different from these new injectors. I'm worried about installing them because of this.
In the picture I'm attaching you can see that the slot where the clip nut attaches is a fraction of an inch but if you were to use the clip nuts on the new injectors they would not push in all the way like the stock injectors and the fuel rail would not be able to be bolted down like it was if you used the clip nuts because the injectors would stick out a fraction of an inch further than they did before.
So, do you need to use the clip nuts or not? I already have these new injectors and my jeep is all ready for injectors to be installed. I'm stuck right now. Help!
In the picture I'm attaching you can see that the slot where the clip nut attaches is a fraction of an inch but if you were to use the clip nuts on the new injectors they would not push in all the way like the stock injectors and the fuel rail would not be able to be bolted down like it was if you used the clip nuts because the injectors would stick out a fraction of an inch further than they did before.
So, do you need to use the clip nuts or not? I already have these new injectors and my jeep is all ready for injectors to be installed. I'm stuck right now. Help!
Hello again. After closer study I have found that these injectors have the exact same poundage and flow per minute rating as the more common Ford 0280155710. Aside from the fact the 710's don't use a "clip-nut" to attach them they are a better injector to use because it is a one piece plastic body instead of the plastic to metal like the ones in this Ebay ad. Plus they have a LOT wider opening at the 4-port spray end so you get a better spray pattern and the whole injector inside is a lot wider necked so it's easier to get a good cleaning of them. I have a set or two of them and could let you have a set for $40 shipped.
Newbie
Joined: Dec 2011
Posts: 4
Likes: 0
From: Sheppard AFB TX
Year: 1999
Model: Cherokee
Engine: 4.0
New 784 Need Help
I just installed a new set of 784 the other day on my 1999 XJ with 120,000 mil 4.0, all went good. all of your tips saved be big time. Jeep started up with no problems and i started to drive it around the block ran great plus 3 MPG, until i hit about 5 miles. That is were she started to buck stall and just running like ***. i got it home MPG doped to 12 and very bad gas smell coming from the tail pipe.
SO far for MX re-flashed the ECU start it 2 time a day still no change and pulled the plugs all of them all of them are covered in black shoat. i also have a good amount of water and white smoke coming out of the tail pip. I did run the code reader and it's not showing any.
do i have a bad Fuel Regulator or i'm i just passing to much gas?
Any ideas would be a big help.
SO far for MX re-flashed the ECU start it 2 time a day still no change and pulled the plugs all of them all of them are covered in black shoat. i also have a good amount of water and white smoke coming out of the tail pip. I did run the code reader and it's not showing any.
do i have a bad Fuel Regulator or i'm i just passing to much gas?
Any ideas would be a big help.
☠ 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 just installed a new set of 784 the other day on my 1999 XJ with 120,000 mil 4.0, all went good. all of your tips saved be big time. Jeep started up with no problems and i started to drive it around the block ran great plus 3 MPG, until i hit about 5 miles. That is were she started to buck stall and just running like ***. i got it home MPG doped to 12 and very bad gas smell coming from the tail pipe.
SO far for MX re-flashed the ECU start it 2 time a day still no change and pulled the plugs all of them all of them are covered in black shoat. i also have a good amount of water and white smoke coming out of the tail pip. I did run the code reader and it's not showing any.
do i have a bad Fuel Regulator or i'm i just passing to much gas?
Any ideas would be a big help.
SO far for MX re-flashed the ECU start it 2 time a day still no change and pulled the plugs all of them all of them are covered in black shoat. i also have a good amount of water and white smoke coming out of the tail pip. I did run the code reader and it's not showing any.
do i have a bad Fuel Regulator or i'm i just passing to much gas?
Any ideas would be a big help.
Seasoned Member
Joined: Jun 2011
Posts: 498
Likes: 0
From: Los Angeles
Year: 1996
Model: Cherokee
Engine: 4.0 H.O.
I just installed a new set of 784 the other day on my 1999 XJ with 120,000 mil 4.0, all went good. all of your tips saved be big time. Jeep started up with no problems and i started to drive it around the block ran great plus 3 MPG, until i hit about 5 miles. That is were she started to buck stall and just running like ***. i got it home MPG doped to 12 and very bad gas smell coming from the tail pipe.
SO far for MX re-flashed the ECU start it 2 time a day still no change and pulled the plugs all of them all of them are covered in black shoat. i also have a good amount of water and white smoke coming out of the tail pip. I did run the code reader and it's not showing any.
do i have a bad Fuel Regulator or i'm i just passing to much gas?
Any ideas would be a big help.
SO far for MX re-flashed the ECU start it 2 time a day still no change and pulled the plugs all of them all of them are covered in black shoat. i also have a good amount of water and white smoke coming out of the tail pip. I did run the code reader and it's not showing any.
do i have a bad Fuel Regulator or i'm i just passing to much gas?
Any ideas would be a big help.
Thread Starter
CF Veteran
Joined: Jan 2009
Posts: 1,964
Likes: 6
From: Baltimore, Maryland
Year: 1994 1993
Model: Cherokee
Engine: 4.0
If it was just one injector blackened I would go with a bad injector but there no way all 6 are bad. The 784s will run fine with the stock '99 psi so there's no need to change the regulator for a good swap. As sugested I'd pop your old injectors back in and see if it changes. If not then something happened.
Newbie
Joined: Dec 2011
Posts: 4
Likes: 0
From: Sheppard AFB TX
Year: 1999
Model: Cherokee
Engine: 4.0
Saturday project
Thank you all for the info. This jeep will never let me do any nice to her. She fights me all the way.
I got a new set of plugs to install Saturday and i will try to do some warm up and cool down cycles to try to have the ECU relearn the new injectors. If at the end of the day i have no joy the old one will be re-installed to see how that works.
I got a new set of plugs to install Saturday and i will try to do some warm up and cool down cycles to try to have the ECU relearn the new injectors. If at the end of the day i have no joy the old one will be re-installed to see how that works.
