injector help
 

There's probably something on here telling me this. But here goes. Got an 89 Cherokee wondering if some injectors out of a 95 would work in it. I know there are differences but would it still swap out.

If your swapping them out put 703's in. But yes the will swap

Which ones are the 703s again.

These are just some I have laying around eventually going to upgrade to a four spray injector.

it would work but not correctly. the older jeeps have different fuel pressure ratings. If he used 703 injectors he would cause his jeep to run Rich. They would work but there are better options.

Op: You would be better suited to using Ford injectors

4.0L
'96-'98 #53030778 23.2lb/hr @ 49psi
'99-'04 #4854181 22.5lb/hr @ 49psi

2.4L
'96-'02 #53030778 23.2lb/hr @ 49psi

'96-'98, ........53030778, ...Grey, .........49psi, .................23.2lb/hr
'99-'04, .........4854181, ...Blue tip, .....49psi, .................22.5lb/hr

Replacement:
Ford Motorsport 19.0lb/hr @ 39psi (Part no. FMS-M9593-C302)
Ford Motorsport 24.0lb/hr @ 39psi (Part no. FMS-M9593-A302)
Ford Motorsport 30.0lb/hr @ 39psi (Part no. FMS-M9593-B302)

Pre 96 the fuel pressure is lower at 39 PSI.

'91-'93 #33007127 21.0lb/hr @ 39psi
'91-'93, ........33007127, ...Brown, .......39psi, .................21.0lb/hr

The Ford injectors are rated at the same pressure, so yes, you can do this as well..... By using:
Ford Motorsport 24.0lb/hr @ 39psi (Part no. FMS-M9593-A302)

'86-'90, ........53003956, ...Black, ........39psi, .................18.6lb/hr

So can I use these 95 injectors or no. I want it to run correctly.

I think what they're saying is you can. BUT. It may run a little rich (as in use a little more gasoline than it usually would) but it would work.

Works awesome fixed my phantom terrible bog down. After hours upon hours of wire and vaccumm run down gas tank blah blah. Love my jeep though

Glad to hear it!

I've taken a little time to try to figure some of this out. The puter and sensors control the Pulse Width, how long the injector stays open. In the same engine a higher flow injector will get a shorter pulse, relative to a lower flow rate injector. The puter can figure this out based on info from the 02 sensor. Gotta be within parameters though. Your 87 may well use 18.6 LB/hr injectors, so with a higher flow rate you won't ever be too lean. In "open loop", while it's cold and running on a "default pulse width" it will be rich, and being rich won't help it heat up. That said at least a couple pretty smart guys here think it goes into closed loop pretty darn quick.

The 21# from the 95 should be OK, I think.

On a tip from Programbo, I tried the 4 hole Volvo injectors, (and sold my 703's a bit later). So that's below. Below that is some info on rates and pressure and stuff. I'm learning here! So there's that!


https://www.cherokeeforum.com/f2/199...r-swap-163105/

http://www.jeep4.0performance.4mg.com/tech_specs.html

V- I liked my 703's too!- V A great improvement over stock.

I don't have a problem with my 703's, but I also put a new O2, but not because I put the new injectors in