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Old 04-13-2011, 11:55 AM   #1
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Default 2000 jeep injector swap questions.

Yes I know that there are tons of write-ups on this but none of them have a direct answer for me.

First for the neon injector swap is there an adaptor I need to get to switch over to the different style connector of is there a different injector all together? I know the 98 or lower take the 703 injector but what is the 794 injector?

second is it hard to swap the newer injectors?

Please I am hoping to do this today but I need to know what to get before I go searching at the pick and pull.
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Old 04-13-2011, 12:26 PM   #2
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did the swap on monday. didnt even use the write up, its pretty straight forward. and seeing how you have a 2000 you would be doing a 784 injector swap, same as me. everything is "plug and play" essentially.

also i had more luck on the stratus 2.4l for the injectors.
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Old 04-13-2011, 12:50 PM   #3
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How was your mileage gain? Have been debating in doing this one for a while now.
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Old 04-13-2011, 03:31 PM   #4
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The injector swap MPG gain is a myth. Some guys see an increase, but it's not due to some miracle the injectors perform. It's the cause of one of these reasons:
1. Swapping out dirty injectors for clean ones.
and/or
2. Changing driving habits

What the injector swap does give you is a smoother idle and better throttle response. If all you're looking for is better MPG's, pull your stock ones, clean them properly (including the micron filter) and reinstall them.
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Old 04-14-2011, 07:13 AM   #5
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So for the 2000 I need the 784 injectors right. I most likely will see an increase because I am sure my injectors are terrible (15-17 mpg stock normal driving). I do hate when you hit the gas there seems to be a dead zone in the fuel like a carbed lawnmower. and the smoother idle is deffinetly a plus.

What years are the 784 injectors found in the stratus? what engine, trim, year???
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Old 04-14-2011, 07:24 AM   #6
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Yes, you need 784's. They can be easily found in 97-01 stratus's (and it's equivalents - Breeze, Cirrus) with the 2.4 4-cyl. Caravan's (equivalents - Town and Country, Voyager) from the same years with the 2.4 have 789's, which are the same as 784's, only green in color. Doesn't matter what trim, as long as that engine is there on both vehicles. Most 00-01 Neon's with the 2.0 will have them as well. Or you could buy a set from me, ready to install, for $60.
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Old 04-14-2011, 10:42 AM   #7
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Quote:
Originally Posted by no rdplz View Post
Yes, you need 784's. They can be easily found in 97-01 stratus's (and it's equivalents - Breeze, Cirrus) with the 2.4 4-cyl. Caravan's (equivalents - Town and Country, Voyager) from the same years with the 2.4 have 789's, which are the same as 784's, only green in color. Doesn't matter what trim, as long as that engine is there on both vehicles. Most 00-01 Neon's with the 2.0 will have them as well. Or you could buy a set from me, ready to install, for $60.

I will see what I can do, I am hopefully going to the jy today after the big junk austion today

So the 789 injectors are the same but just green?Why the h*** did chrysler do that?

If I cannot find some I will let you know.
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Old 04-14-2011, 02:15 PM   #8
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Quote:
Originally Posted by tylerspyler View Post
So the 789 injectors are the same but just green?Why the h*** did chrysler do that?
Probably the same reason you'll find different injector numbers when looking through a bunch of Neon's - pure stupidity. Neon's can have 703's, 740's, 784's, or 782's. Well, if you can't get some, let me know.
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Old 04-14-2011, 08:35 PM   #9
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Bosch color codes their injectors based on customer requirements (injector body color on EV6 and a snap in color clip on EV14). If Chrysler switched to injector colors but kept the same part number, it probably was to signify some change (upgrade, model year…).

Forget the …740s, because they are too short to fit. The …789s would be a better match to the stock 4.0 injectors (at least the ones on my 1990) since they match the dynamic flow rate better. The dynamic flow is a measurement of how much fuel (or Heptane in a test cell) the injector flows when pulsed 1000 times for 25 milliseconds each pulse with a 3 bar supply pressure.

To answer your original question, you do not need to change the connector style unless you are changing the style of connector on the injector. Rather than running the 703 injectors on my 1990 Jeep which used a Jetronic connector plug or the 784 (USCAR connector style), I am going to try a lower flowing EV14 injectors 0 280 158 021 and splice in the USCAR connectors to the existing Jetronic connectors. This way I can readily switch injectors from stock and back (or to 703s/784s/789s…) as needed for tuning.

PM me for more details.
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Old 04-15-2011, 05:59 AM   #10
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Default Link to Bosch injector data

Hi All,

Here is a link to most of the Bosch injectors: You are looking for 12 Ohm coils and about 60.3 mm between o-rings for the length.

http://www.usrallyteam.com/content/p...ector_data.xls
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Old 04-15-2011, 09:13 AM   #11
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^^ Um, you do realize I never said to use 740's, right? I only said they're in some Neon's. Point being, make sure you get the right ones. He knows he needs 784's, and if he can't find those, then 789's will work as the only difference is the injector color.

For your 90, 703's area direct plug in since you've got ev1 connections. 789's aren't going to make any difference for you. Now, if you wanted more performance from them, splice in the ev6 connections and run Ford 849's. These are much harder to find (99 Taurus/Sable with the 3.0 is the only year/vehicles that have them), but have a higher flow rating. I will say though, that these should only be used if you're running a true CAI, bored TB, and better exhaust. Otherwise, you're just wasting your time with them.
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Old 04-15-2011, 11:23 AM   #12
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The 789 have the same WO (wide open) flow rate as the 784, but have a lower fuel delivery rate per 25 ms pulse. This will help with tuning and emmisions at the low end of the fuel map.

Running an injector with a larger dynamic flow makes it harder for the ECU to adjust to fit the injectors. For example, try to get a fire hydrant to deliver 1 cup of water a minute. Now try it with your kitchen sink. It is alot easier.

Your ECU can only process and deliver signals in finite increments and the injector components can only move so fast in response to incomming signals. An injector with a lower fuel delivery per pulse but with the same WO delivery will be easier to tune.

That is likely the reason for the Chrysler change to the 789's. They also changed the spray type (orafice plate) and the spray angles as well and that would lead to a change in the molding color.
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Old 04-16-2011, 09:02 AM   #13
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Default Injector Swap gone GREAT!

I spliced in the connectors and swapped in the ...158 021 injectors this morning. Skipped the ECU reset and started it up. It fired up, warmed up, and idled like normal. I drove around for a few minutes and all was fine. Then from a stop, I was able to slowly go through all 5 gears on level ground without touching the gas petal. I would say that my low end (< 1000 RPM) performance has improved. The only other vehicle I have ever done that in was a diesel sedan.
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