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Injector Swap Writeup for the 4.0L
- Thread starter dukie564
- Start date
cruiser54
NAXJA Forum User
- Location
- Prescott, Az
Probably the issue. Don't skimp on the oil.
jrowell
NAXJA Forum User
- Location
- Bakersfield
So... say sombody recently did this swap... and pulled those little plastic pieces off before installing the injectors as he thought they were just protective caps. Let's say that person has been running them without issue for a couple weeks. Should that person be concerned? What is the function of those plastic pieces?
cruiser54
NAXJA Forum User
- Location
- Prescott, Az
Can you identify this person? LOL.
I don't know. A Google search could yield some results for ya.
cruiser54
NAXJA Forum User
- Location
- Prescott, Az
LOL. At least it's unlit!!!
- Location
- Aberdeen, MD
do not remove the plastic pintle caps. They are there to keep the oring in place and position the injector within the cylinder
jrowell
NAXJA Forum User
- Location
- Bakersfield
So… uhhh... I told the guy to contact the company he bought them from and order some new pintle caps…
He has not decided if he should pull the injectors and put the caps on, as there are conflicting articles on wether they are needed...
Considering that the stock injectors, at least on mine, did not have the pintle caps and this guy you know has been running them with no problems I wouldn't bother installing them. Says the guy who had to pull his fuel rail assembly again today. Found the number 3 O ring was the problem, I apparently pinched it when I pushed it up into the rail which put a small indentation across the O ring body, apparently that was enough to allow the gas to leak. Installed a new O ring, reinstalled the fuel rail, fired her up, all is well. Whew!
tricyclerob
NAXJA Forum User
- Location
- maryland
Looking for a little help. I've been reading about injectors here and on Cherokee Forum until I really do think I'm blue in the face.
I'm restoring a 92' on a rotisserie and have the floor pans done, engine and trans out and painted.
This is more or less a stock build with Old man Emu 2" lift. No big tires.etc.
I'm an old guy, been there done that. I can look at plugs and rejet a carb, but this is my first time modifying a F.I. engine. I'm looking for maximum "driveability", with a low to mid-range hp increase.
My thoughts are:
1. Borla long tube headers, with 2.5" Cat., pipe, and muffler.
2. Port matching the head and manifold to the gasket.
3. Mopar purple camshaft, [Camshaft, Lifters, Hydraulic Flat Tappet, Advertised Duration 240/240, Lift .430/.430, Jeep, 4.0L, Kit] with lifters and springs.] 900-4800 rpm.
4. Modified stock airbox with highflow flat filter. [inlet to box extended to opening in rad.support].
5. 62mm throttle body
6. Neon 703 injectors
7. High flow water pump.
Here are my questions;
Will the 703's flow enough for these modifications? I mostly see them recommended for stock engines.
Do I need to switch from 39lb FPR to the 49lb Regulator? Would this generate more flow from the 703's? Too much?
I was also going to install an adjustable MAP sensor for fine tuning the air/fuel mixture on the dyno.
Like I said, a mild build.
Am I on the right track here?
thanks,
robj
p.s. please, no stroker suggestions, I'm not interested in going that route.
I'm restoring a 92' on a rotisserie and have the floor pans done, engine and trans out and painted.
This is more or less a stock build with Old man Emu 2" lift. No big tires.etc.
I'm an old guy, been there done that. I can look at plugs and rejet a carb, but this is my first time modifying a F.I. engine. I'm looking for maximum "driveability", with a low to mid-range hp increase.
My thoughts are:
1. Borla long tube headers, with 2.5" Cat., pipe, and muffler.
2. Port matching the head and manifold to the gasket.
3. Mopar purple camshaft, [Camshaft, Lifters, Hydraulic Flat Tappet, Advertised Duration 240/240, Lift .430/.430, Jeep, 4.0L, Kit] with lifters and springs.] 900-4800 rpm.
4. Modified stock airbox with highflow flat filter. [inlet to box extended to opening in rad.support].
5. 62mm throttle body
6. Neon 703 injectors
7. High flow water pump.
Here are my questions;
Will the 703's flow enough for these modifications? I mostly see them recommended for stock engines.
Do I need to switch from 39lb FPR to the 49lb Regulator? Would this generate more flow from the 703's? Too much?
I was also going to install an adjustable MAP sensor for fine tuning the air/fuel mixture on the dyno.
Like I said, a mild build.
Am I on the right track here?
thanks,
robj
p.s. please, no stroker suggestions, I'm not interested in going that route.
cruiser54
NAXJA Forum User
- Location
- Prescott, Az
#2 and #5 for sure. Been there and done that more than once. Worth it.
tricyclerob
NAXJA Forum User
- Location
- maryland
Should I have posted this in "Modified Tech"? It's a bit of a general question, and an injector question.
robj
robj
- Location
- Aberdeen, MD
703s will flow enough for the setup you propose. No need to swap the regulator it's already at the correct PSI for your application.
No need for adjustable MAP either IMO. The mods you are proposing won't throw the A/F ratio outside of the range of automatic adjustment.
#1 and #5 will have the biggest impact on performance.
No need for adjustable MAP either IMO. The mods you are proposing won't throw the A/F ratio outside of the range of automatic adjustment.
#1 and #5 will have the biggest impact on performance.
- Location
- Dayton Ohio
Hey guys I know this threads old but I know how people are when you don't search first.
I have an 01 sport.
I Just did the EV6 swap over the weekend and I expected it to crank long at first start up but now it's cranks long every time and I have to pedal it. Like it's not enough pressure at first but I don't smell any gas or any signs of a leak. I know it takes he first 50 to really get into tune but this seems like too much. I searched for this symptom but of course it seems like I'm the only one with this problem. Appreciate any help you guys have
I have an 01 sport.
I Just did the EV6 swap over the weekend and I expected it to crank long at first start up but now it's cranks long every time and I have to pedal it. Like it's not enough pressure at first but I don't smell any gas or any signs of a leak. I know it takes he first 50 to really get into tune but this seems like too much. I searched for this symptom but of course it seems like I'm the only one with this problem. Appreciate any help you guys have
ILLJUSTFABIT
NAXJA Forum User
- Location
- Connecticut
Question for those familiar with injector sizing:
Will 290 cc/min injectors work on the 4.0 or do they flow too much for the ecu to handle?
I have 12 stock/ factory injectors from the 2006 Nissan 350Z
Will 290 cc/min injectors work on the 4.0 or do they flow too much for the ecu to handle?
I have 12 stock/ factory injectors from the 2006 Nissan 350Z
cruiser54
NAXJA Forum User
- Location
- Prescott, Az
ILLJUSTFABIT
NAXJA Forum User
- Location
- Connecticut
I realize the injectors flow more than required, the question is: Can the ecu control them?
cruiser54
NAXJA Forum User
- Location
- Prescott, Az
Gotcha.
What year are you talking about?
The biggest problems that ECUs and PCMs have with larger injectors is not having the capability to trim them down for idling purposes.
What year are you talking about?
The biggest problems that ECUs and PCMs have with larger injectors is not having the capability to trim them down for idling purposes.
- Location
- WA state
What fuel pressure are those injectors rated at for that flow?
