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Unread 11-05-2013, 06:29 PM   #541
jnowak
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1993 ZJ 
 
Join Date: Nov 2011
Location: dahlonega, ga
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Quote:
Originally Posted by PolkaPower
Just completed a round trip of around 1400 miles. I measured from full to half tank and came up with just under 14mpg going about 70 roughly with two adults and the rear filled with luggage and the spare .I'm about 235 and my wife is about 130. It's not very accurate since I'm guessing the half tank marker to me 11.5 gallons. 789's were nice and smooth the whole way.
What size tires? What engine? And was that an improvement of your previous set up?

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Unread 11-05-2013, 06:46 PM   #542
PolkaPower
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Quote:
Originally Posted by jnowak View Post
What size tires? What engine? And was that an improvement of your previous set up?
It's got 245/75/16 treadwright guard dogs-ten ply, OME HD coils, 5.9. A far as the motor running smoothly it's an improvement. The difference between the 703's I had in there and these 789's are that the 789's are professionally rebuilt and I did the 703's at home. I could have squeezed out better mpg's but the thought of going 65mph for 6 hours made me nuts. Anything after that and my mpg's drop pretty good. I punched it from 70- 90 once and it felt nice and solid.

On my last 5.2 I had headers and full 3" exhaust with a mopar performance computer. That really made a difference especially at highway speeds. It took way less throttle to get going. It made me think about doing the exhaust on this one.

I did notice that when I got up in altitude quickly in the mountains that the motor lost power for a little bit. I noticed the same thing back west too. The computer had to adjust then it was fine.
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Unread 11-06-2013, 04:38 AM   #543
jnowak
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I am being lazy and not reading through the previous pages. Why did you go from 703 to 789? I currently am running the 703s in a 4.0.
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Unread 11-06-2013, 07:33 AM   #544
PolkaPower
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Quote:
Originally Posted by jnowak View Post
I am being lazy and not reading through the previous pages. Why did you go from 703 to 789? I currently am running the 703s in a 4.0.
I got the 703's from two junked neons and I thought they were causing me to run a little rich. I leaked tested them 3 times but they are working fine. Turned out to be the cat converter. I rebuilt them with new baskets and stuff but I wanted some professionally rebuilt injectors. You know, flow matched and all that so I got the 789's because they were at a good price and I was still suspecting the that there was something off about the 703's. I could have kept the 703's and been fine in hind sight but the 789's are great. My motor runs smoother with them than the 703's I had in there.
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Unread 11-09-2013, 04:19 PM   #545
lumpy300
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Join Date: Jul 2009
Location: kansas
Posts: 3
ford injectors

hello all, I just read through all 37 pages of this thread and seen a few guys asking about the ford injectors in the 4.0. I bought some reman injectors off of ebay awhile back and got them out and their ford models . the guy never said anything in his add about them being from ford. the numbers on the injectors are 028015039 and 0280150943. they claim to be flowed and matched sets as replacement for the 94 4 liter engine. has anyone heard of these or used them? I googled the numbers and came up with a 4.6L ford engine injector but mine is currently getting decent fuel mileage and was just looking for a little better power out of it with the 4 hole injector swap. my jeep has 144k miles and no cat with a 2 1/2" exhaust on it and it seems like I have to shutoff overdrive to pull a 1200 lb. trailer. any help will be appreciated.
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Unread 11-09-2013, 05:20 PM   #546
jnowak
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Quote:
Originally Posted by lumpy300
hello all, I just read through all 37 pages of this thread and seen a few guys asking about the ford injectors in the 4.0. I bought some reman injectors off of ebay awhile back and got them out and their ford models . the guy never said anything in his add about them being from ford. the numbers on the injectors are 028015039 and 0280150943. they claim to be flowed and matched sets as replacement for the 94 4 liter engine. has anyone heard of these or used them? I googled the numbers and came up with a 4.6L ford engine injector but mine is currently getting decent fuel mileage and was just looking for a little better power out of it with the 4 hole injector swap. my jeep has 144k miles and no cat with a 2 1/2" exhaust on it and it seems like I have to shutoff overdrive to pull a 1200 lb. trailer. any help will be appreciated.
I used the 703s on my 4.0. Actually couldn't find the right fords at the jy. Don't expect a power increase, rather a smoother idle, and a smoother acceleration.
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Unread 11-10-2013, 09:55 AM   #547
StPaul59
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Quote:
Originally Posted by lumpy300 View Post
my jeep has 144k miles and no cat with a 2 1/2" exhaust on it and it seems like I have to shutoff overdrive to pull a 1200 lb. trailer. any help will be appreciated.

Anytime you tow you are supposed to shut off the overdrive.
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Unread 11-10-2013, 10:54 AM   #548
Scopez
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Quote:
Originally Posted by StPaul59
Anytime you tow you are supposed to shut off the overdrive.
I towed for 3hrs straight with the ZJ, overdrive on because I was cruising at 60 and it never downshifted. If you feel your transmission downshifting a lot, that's when turning overdrive off is critical. I've hauled a bed full of logs to my cabin and had to turn tow/haul mode on in the 13 Ram. It was downshifting every hill.
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Unread 11-11-2013, 07:50 AM   #549
lumpy300
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installed the 4.6L injectors yesterday. deff has a smoother idle and maybe a lil more power. not bad for $60.
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Unread 11-13-2013, 03:57 AM   #550
torchd
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Still rockin' my 703s. I've had them in since 7/2012. At the same time I did the injectors I threw on a header and a WJ intake. Then a couple weeks later did my entire exhasut system in 2.5" piping.


Jeep is still slow lol
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[b]1998 Jeep Grand Cherokee Laredo[/b]
2" BB Pucks | SkyJacker Hydro Shocks | Rubicon Wheels | Cooper 245/75/16 Tires

[b][color=red]2002 Trans Am[/b][/color]
Cam, Full Exhaust, Stock Heads, Stock LS6 Intake and Stock 10 bolt with 3.42s
[b]420 RWHP and 382 RWHTQ[/b]
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Unread 11-14-2013, 01:43 AM   #551
Football47
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Still looking for 703 injectors for 4.0... anyone have them?
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Unread 11-14-2013, 04:14 AM   #552
SpectralZJ98
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Football47

Yep. Got a set that hasn't been rebuilt yet. You need them?
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Unread 11-16-2013, 09:03 PM   #553
torchd
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Wrong thread lol
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[b]1998 Jeep Grand Cherokee Laredo[/b]
2" BB Pucks | SkyJacker Hydro Shocks | Rubicon Wheels | Cooper 245/75/16 Tires

[b][color=red]2002 Trans Am[/b][/color]
Cam, Full Exhaust, Stock Heads, Stock LS6 Intake and Stock 10 bolt with 3.42s
[b]420 RWHP and 382 RWHTQ[/b]
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Unread 11-27-2013, 03:57 AM   #554
Football47
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Quote:
Originally Posted by SpectralZJ98 View Post
Football47

Yep. Got a set that hasn't been rebuilt yet. You need them?
I need rebuilt ones though, don't have the time right now to rebuild them myself.
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Unread 11-27-2013, 04:25 AM   #555
SpectralZJ98
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There's a company that does awesome work. The auction number is 190827041197 on eBay. They even have flow matching available for a little extra.
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703 , 715 , ford , fuel injector , neon , swap

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