Originally Posted by 107vrrm

good info

Originally Posted by rainman

I've been reading threads here and there about injector swaps... Why is this news, I don't know... But here's a quick run-down to answer some questions I've seen posted here.

Both Neon and Jeep injectors are high Z (impedance), 19lbs/hr injectors.

no XJ 4.0l injector or neon injector flows 19 lbs /hr (19#), it is commonly stated on the web that the renix injectors are 19# but when flow tested on a proper rig coas got 240cc@43.5 psi~22.5#
So maybe on the renix definitely not on the rest of the fuel injected XJ's.

Older Jeeps (not sure till what years) along with 95-99 model year neons ran an EV1, single hole injector. 00-05 Neons run on an EV6, four hole injector. All are rated at the same 19 lbs/hr.
95-97 neons had a 4 hole ev6 injector with a EV1/ jettronic electric plug 208 155 703 = the one you want for pre 99 Xj's.


My concern with those of you taking injectors out of 2nd Gen (00-05 neons), is the injector length. Yes, the plug is different, and that's an easy fix (just splice in new injector connector). But depending on which fuel rail/intake manifold combo you have on your Jeep, you may be setting yourself up for failure with the new, shorter, EV6 type injector from the 2nd Gen Neon.
Injectors have part numbers cast on to the side of them. Check the part number before you pull it out of the wreck if it is the right part number it will work. 280 155 784 for 99-01 XJ's.


That said, I've pulled some EV6 injectors out of a newer jeep. The injector was longer than Neon injectors; and to my surprise, it only had one hole.

All xj's have pintal (single hole) injectors.

So for those of us with older Jeeps (mine is a '89), be mindfull of the size of the new injector compared to your old one. It may not fit properly into the intake manifold if it's too short (and as stated before, you'll have to solder in an EV6 injector clip). Those of you with newer jeeps that already have EV6 injectors, you just have to worry about injector length with the neon injectors.
There is no reason to F@#k about with soldering injector clips just get the right EV6 injector, Ev6 injectors came with ev1 (280 155 703) and UScar (280 155 784) electrical clips. if you want to fine,its your heap, but please do not tell others they have to.
part numbers again! right part number = plug and play.


And I don't want to rant, but I'm also concerned about fuel pressure... 2nd Gen Neons run at a higher fuel pressure than older Jeeps. My ('89) Jeep runs at 31 psi. I believe my 2nd Gen Neons fuel pressure is something like 45 psi... Maybe even in the 50s. I'll look into it and report back.
neons run @49 psi.
Renix run at 39 psi @WOT
OBD1 run at 39 psi @WOT
OBD2 run at 49 psi constant.
pressuredifferences are ok with ev6 / 4 hole injectors, could not do it with 1 hole injectors.

http://www.ausjeepoffroad.com/forum/...ad.php?t=92236

Originally Posted by rainman

So not heat soak...........
1) I would check fuel pressure on the fuel rail,
2) do 2000's have a inline fuel filter near the tank like the earlier models? if so i would replace that, after 10 years it is about due and only costs a few bucks.
On the "only" single hole ford injectors;
They(Ford XR3Z 9F593 A4B / XR3E 9F593 A4B ) do have 1 hole but do not confuse them with a pintal type injector / stock XJ injector .
-no it is not simple-
The EV6 method for increasing atomization was by increasing holes number and reducing each hole size. One can't add holes and reduce size indefinitely, so a new approach was needed when regulations became more strict.
The newer design single hole injectors do not relaying on number of holes, it's a completely different approach with the difference in the internal orifice which allow far better atomization. This allow even better ability to work on variable pressure, as with most newer car the pressure is computer controlled.
This, in turn, gives more accurate fuel mixture at any given pressure.

Originally Posted by smtippin

It is posts like yours, rainman, that really get me cautious to do this mod. I'm tracking the other treads on injector swaps and it doesn't seem that there is 1 authoritative reference. for those of us who will never comprehend all of the intricate details, we just need to know what injectors, from what vehicle, and how to verify they are the right ones for our year.
That is why I made up the tip sheet, which I trust you have seen. Then check the part number-cast into the side of the injector- before you pull out of wreck/ put in your jeep.
Modding jeeps/ DIY is not for everyone.

There is just too much inaccurate info going around for me to feel comfortable spending what is a lot of money for me on what feels like a gamble. It sure would be nice to do the mod though.

s

Originally Posted by Crunch

Do you know if anyone has used these yet, and the results? I have an in tank filter. I think I'm going to replace the whole fuel pump unit.

Originally Posted by rainman

You are right there is allot of false info on the net.
good luck with it.

Originally Posted by tannerp89

ha ha right. you seem to know your **** when it comes to injectors though so...thats why i listened to you

Originally Posted by smtippin

It is posts like yours, rainman, that really get me cautious to do this mod. I'm tracking the other treads on injector swaps andit doesn't seem that there is 1 authoritative reference. for those of us who will never comprehend all of the intricate details, we just need to know what injectors, from what vehicle, and how to verify they are the right ones for our year.

There is just too much inaccurate info going around for me to feel comfortable spending what is a lot of money for me on what feels like a gamble. It sure would be nice to do the mod though.

s

Originally Posted by rainman

yes a couple of guys have done it just search with the part numbers to find it.
If it was me I would check the pressure on the fuel rail before replacing parts.

Originally Posted by thekevin

Thanks for the answer rainman, I am going to swap these out next Friday when I get back home, I was just expecting to see 4 holes when I opened them up and I wanted to make sure I didnt order the wrong thing.