The Definitive Injector Swap HOW TO - Page 6 - JeepForum.com

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post #76 of 675 Old 03-10-2012, 11:33 PM Thread Starter
zander21510
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Yup. Just check the numbers to be sure

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post #77 of 675 Old 03-11-2012, 01:06 PM
trailhound
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Ok so my injectors of the 5.8 is the wrong numbers...its of a 95 anyways. However I have injectors off a 97 5.4 ad the only numbers are. Fote-d5a Which according to google are 028 -015-0943...so I can't use these either right? Cause mine need to be replaced and id rather use what I have you know. I'm sorry fo the questions. I'm a painter not a mechanic, trying to learn.
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post #78 of 675 Old 03-14-2012, 11:30 AM
augiedoggy
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96 up flows at 49psi pressure (15% more fuel flow than 39psi)
I find it interesting that the jeep used the same 778 injectors that doge used when they switched to 49psi fuel pumps only jeep uses them with a 39psi pump so they push less fuel...and doge used a smaller injector with the 39psi pump on the 94-95 rams... Maybe I have been misinformed?

Last edited by augiedoggy; 03-15-2012 at 03:48 PM.
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post #79 of 675 Old 03-15-2012, 03:46 PM
augiedoggy
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Quote:
Originally Posted by z71tbi View Post
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
This appears to be exactly the case... I have the 703 injectors in my 96 and its running pig rich and the pcm is overwhelmed with removing as much fuel as possible...fuel trim levels are at -33 now at idle and she smokes.....not as bad after the pcm tried to adjust but still smokes just the same.

I ordered and adjustable fuel regulator to knock the pressure down to 39psi and see if that helps.
Theoretically I should be able to dial it right in this way and view the realtime fuel trim levels on my android phone through the "torque application and my $15 bluetooth obd2 "ELM327"interface module...(awesome buy IMHO BTW)
The seller on ebaY I purchased the injectors from has been MIA so far and hasnt responded to my question of whether its the right injector for my year ram because of the 49psi... funny because he was selling smaller yellow injectors for the 94-95 rams that use 39psi...
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post #80 of 675 Old 03-15-2012, 07:31 PM
torchd
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Quote:
Originally Posted by augiedoggy View Post
This appears to be exactly the case... I have the 703 injectors in my 96 and its running pig rich and the pcm is overwhelmed with removing as much fuel as possible...fuel trim levels are at -33 now at idle and she smokes.....not as bad after the pcm tried to adjust but still smokes just the same.

I ordered and adjustable fuel regulator to knock the pressure down to 39psi and see if that helps.
Theoretically I should be able to dial it right in this way and view the realtime fuel trim levels on my android phone through the "torque application and my $15 bluetooth obd2 "ELM327"interface module...(awesome buy IMHO BTW)
The seller on ebaY I purchased the injectors from has been MIA so far and hasnt responded to my question of whether its the right injector for my year ram because of the 49psi... funny because he was selling smaller yellow injectors for the 94-95 rams that use 39psi...
93-95 have an adj. fuel pressure regualtor. 96-98 do not. Do not wast you're money

1998 Jeep Grand Cherokee Laredo
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post #81 of 675 Old 03-15-2012, 10:51 PM
BenHinz27
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I have 8 703 injectors forsale. Pm me or email me. Hinz54@gmail.com
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post #82 of 675 Old 03-16-2012, 06:51 AM
augiedoggy
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Quote:
Originally Posted by torchd View Post
93-95 have an adj. fuel pressure regualtor. 96-98 do not. Do not wast you're money
I'm confused by what your saying? I have the new injectors installed already... and since I have the 49psi fuel pump (I have a 96) I need to adjust the pressure down to 39psi to get things to work correctly... how would I be wasting my money?
and 93-95 jeeps must use different 39psi pumps than they put in the dodge vehicles...
On another note the seller I bought my injectors from got back to me and is going to send me some injectors to test and give him feedback on with ones work the best and make the pcm happy....
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post #83 of 675 Old 03-16-2012, 12:00 PM
amremt408
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I'm on my phone so I can't see signatures, but it seems like a lot of the people having issues appear to have dodge trucks... Is anyone having issues with their JEEP after having installed the 703s? Specifically the 5.9 JEEP motor? Also, what techniques have you all been using to clean the injectors?

5.9 ZJ... 4.5" Rubicon Express short arms. Bridgetone REVO 2's... 265/75/16.

2004 WJ... OME HD coils, Bilsteins shocks, JKS adj track bar, MOOG SS, ADDCO rear sway bar with ext., Bridgestone REVO 265/70/17.
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post #84 of 675 Old 03-16-2012, 12:16 PM Thread Starter
zander21510
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Well the way I understand it the 5.9 is just a 5.2 with a bigger bore so it shouldn't be a big problem

Just wipe off the outside with a rag, make sure you get the kit in the OP and finally run a bottle of techron or seafoam in your gas tank
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post #85 of 675 Old 03-16-2012, 01:11 PM
amremt408
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Sounds good, I have the kit from the OP. Any special tools required?

5.9 ZJ... 4.5" Rubicon Express short arms. Bridgetone REVO 2's... 265/75/16.

2004 WJ... OME HD coils, Bilsteins shocks, JKS adj track bar, MOOG SS, ADDCO rear sway bar with ext., Bridgestone REVO 265/70/17.
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post #86 of 675 Old 03-16-2012, 02:17 PM
Godzilla_janus
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My 2 cents.
I decided to burn e85 in the V8. Good or bad idea, that is not the question here.
With origin injectors, it seemed to me that the engine was running poor when putting the right pedal down.
I've read somewhere that you need 30% e85 more than gaz for the same energy.

So I put 30% bigger injectors, Ford Racing red one.
Wow, then engine runs very fine at all speeds.
But, it was too rich when burning gaz.
One day, I found an inexpensive air intake. Magic ! the engine was not rich anymore.

The ZJ PCM is GREAT. It allows a lot of changes in the input chain. You can test new injectors with no fear: they will work !
(I am not mechanic, just a guy who tries, make mistakes and sometime is lucky !)

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post #87 of 675 Old 03-16-2012, 07:45 PM
augiedoggy
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Quote:
Originally Posted by zander21510 View Post
Well the way I understand it the 5.9 is just a 5.2 with a bigger bore so it shouldn't be a big problem

Just wipe off the outside with a rag, make sure you get the kit in the OP and finally run a bottle of techron or seafoam in your gas tank
Normally bigger bore also means more gas flow but in this case they are close enough... The issue is everyone in this thread that is running 703's and a magnum engine also seems to be driving a 95 or old 5.2 liter with only 39psi fuel pressure...once you up that to 96 or newer fuel pump thats 49psi and 15% more flow your pushing through those injectors... It need to be determined for sure if jeep changed their fuel pumps to 49psi ones in 96 like dodge did... I if you look at the places that sell aftermarket or upgraded injectors for these engines you'll see they all offer different injectors for the 95 and old than they offer for the 96 up models... the pcm is setup with preprogrammed fuel tables the truck relys on for proper AF ratio until its gets warm enough to pay attention to the 02 sensor and make adjustments... so even if it does work of in WOT conditions it may run pig rich during warmup every time...
my fuel trim is at -33 when in open loop warming up and goes al the way to +30 when fully warmed up... talk about something being out of whack..
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post #88 of 675 Old 03-17-2012, 05:55 PM
V65Ozzie
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Just got back from the JY, dug around for a while, got some injectors out of a Tbird. Upon closer inspection they seem to be 700's. Can I use these? Connectors look the same, it was a 97 Tbird V8 I believe.
All the Crown Vics had the different style electrical connectors, no joy there.
Didn't see any of the correct numbers on the Chrysler/ Dodge side either.

Did find a new glove box light assembly.......
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post #89 of 675 Old 03-18-2012, 08:32 PM
augiedoggy
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So I found gas in my oil now that its running so rich....
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post #90 of 675 Old 03-19-2012, 10:20 PM
sammyb123
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If I wanted to get new injectors from let's say AutoZone what would I tell the guy at the counter I called them this afternoon and the guy on the phone was oblivious
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703 , 715 , ford , fuel injector , neon , swap

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