703/784 injector swap write up
Seasoned Member
Joined: Sep 2010
Posts: 306
Likes: 1
From: Chattanooga
Year: 1989
Model: Cherokee
Engine: 4.0L I6
21. Disconnect your battery terminals and hold them together for 30 seconds. After those 30 seconds, reattach the terminals to the battery.
22. Turn your ignition to the "ON" position - DO NOT START YOUR JEEP.
23. Turn your headlights on, wait 10 seconds, then turn them off.
24. Turn the ignition to the "OFF" position.
25. Start your Jeep. Your ECU is now reset and will "relearn" the proper fuel trim levels for the new injectors over the next 50 warm up cycles.
22. Turn your ignition to the "ON" position - DO NOT START YOUR JEEP.
23. Turn your headlights on, wait 10 seconds, then turn them off.
24. Turn the ignition to the "OFF" position.
25. Start your Jeep. Your ECU is now reset and will "relearn" the proper fuel trim levels for the new injectors over the next 50 warm up cycles.
CF Veteran
Joined: Oct 2010
Posts: 2,412
Likes: 2
From: York PA/State College PA
Year: 2001
Model: Cherokee
Engine: 4.0L I6
Ok, a couple questions, I know I need 784's but...
1. How do you drain the fuel pressure?
2. Lube the o-rings on the engine and fuel rail side of the new injector?
3. Where can I buy di-electric grease and you actually put it right in the female part of the connectors?
4. I have a sub and will holding the positive and negative terminals together damage the sub/amp at all. I didn't wire it, nor do I know how to, but I know that there is a wire from the amp that connects directly to the positive terminal. Should I remove it first?
5. How do I "refill or undrain" my fuel pressure after the swap?
Thanks
1. How do you drain the fuel pressure?
2. Lube the o-rings on the engine and fuel rail side of the new injector?
3. Where can I buy di-electric grease and you actually put it right in the female part of the connectors?
4. I have a sub and will holding the positive and negative terminals together damage the sub/amp at all. I didn't wire it, nor do I know how to, but I know that there is a wire from the amp that connects directly to the positive terminal. Should I remove it first?
5. How do I "refill or undrain" my fuel pressure after the swap?
Thanks
Thread Starter
CF Veteran
Joined: Jan 2010
Posts: 5,482
Likes: 25
From: Virginia Beach by way of Michigan
Ok, a couple questions, I know I need 784's but...
1. How do you drain the fuel pressure?
2. Lube the o-rings on the engine and fuel rail side of the new injector?
3. Where can I buy di-electric grease and you actually put it right in the female part of the connectors?
4. I have a sub and will holding the positive and negative terminals together damage the sub/amp at all. I didn't wire it, nor do I know how to, but I know that there is a wire from the amp that connects directly to the positive terminal. Should I remove it first?
5. How do I "refill or undrain" my fuel pressure after the swap?
Thanks
1. How do you drain the fuel pressure?
2. Lube the o-rings on the engine and fuel rail side of the new injector?
3. Where can I buy di-electric grease and you actually put it right in the female part of the connectors?
4. I have a sub and will holding the positive and negative terminals together damage the sub/amp at all. I didn't wire it, nor do I know how to, but I know that there is a wire from the amp that connects directly to the positive terminal. Should I remove it first?
5. How do I "refill or undrain" my fuel pressure after the swap?
Thanks
2. Yes - lube both o-rings on each injector. A very small amount of Vaseline works very well.
3. You can get it from your local parts store at the counter. You don't need much, so just get one of the small packs.
4. Nothing will happen to your sub and amp. I have a sub and amp that I wired in myself and I can promise you that nothing will happen to it.
5. Turn your key to the "On" position and let it sit there for about 2-3 seconds before starting your Jeep.
Those are supposed to be a replacement for the orange/brown pintle caps. If you want, I have some extra caps I can send out to you (no charge).
☠ CF Sheriff ☠
Joined: Nov 2009
Posts: 15,197
Likes: 18
From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
Thread Starter
CF Veteran
Joined: Jan 2010
Posts: 5,482
Likes: 25
From: Virginia Beach by way of Michigan
CF Veteran
Joined: Oct 2010
Posts: 2,412
Likes: 2
From: York PA/State College PA
Year: 2001
Model: Cherokee
Engine: 4.0L I6
Originally Posted by no rdplz
1. There's a valve on the rail. Use this to release the pressure.
2. Yes - lube both o-rings on each injector. A very small amount of Vaseline works very well.
3. You can get it from your local parts store at the counter. You don't need much, so just get one of the small packs.
4. Nothing will happen to your sub and amp. I have a sub and amp that I wired in myself and I can promise you that nothing will happen to it.
5. Turn your key to the "On" position and let it sit there for about 2-3 seconds before starting your Jeep.
Those are supposed to be a replacement for the orange/brown pintle caps. If you want, I have some extra caps I can send out to you (no charge).
Junior Member
Joined: Jun 2009
Posts: 65
Likes: 0
Model: Cherokee
I'm going to the 'pull-it' JY for 703 injectors from a neon. I've got a 90' xj with leaking injectors. Does it matter if the neon is SOHC or DOHC? Which year neon's should i look for to swap from? I read 1995 & 1996 but no mention of soch or dohc.
☠ CF Sheriff ☠
Joined: Nov 2009
Posts: 15,197
Likes: 18
From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
it's the older 2.0L neons 95-97. Pretty much a crap shoot just check the injector number (left side of injector) before you start disassembly.
Look for this engine:
Look for this engine:
Member
Joined: May 2010
Posts: 167
Likes: 0
From: Concho,AZ
Year: 1987
Model: Cherokee
Engine: 4.0
You can also find the 703 in the dodge stratus, or chrysler cirus with the four cyl,.
CF Veteran
Joined: Feb 2011
Posts: 3,500
Likes: 0
From: Long Beach, Ca
Year: 2000
Model: Cherokee
Engine: 4.0 I6
Originally Posted by no rdplz
Let me get them out to askingzforzit first and then I'll see how many I have left. I'll let you know.
Thread Starter
CF Veteran
Joined: Jan 2010
Posts: 5,482
Likes: 25
From: Virginia Beach by way of Michigan
I'll send them out to you anyway, just in case the rings don't work as well. It's the cost of a stamp so I'm not concerned. I figure if I'm gonna sell them to you they better meet my own strict standards. I'd rather make sure you're happy with what you bought.