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Old 04-02-2013, 11:49 AM   #1
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Ford 4.6 injectors in a Jeep 4.0?

has anyone tried this mod. I have heard that the multi- port injectors out of the Ford 4.6 will fit w/ no modifications to the electrical harness and
deliver 5-10 hp and 3-5 mpg.

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Old 04-02-2013, 12:28 PM   #2
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If they delivered 3-5 more mpg why wouldn't the factory have gone with a design similar to the ford ones?

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Old 04-02-2013, 12:53 PM   #3
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3-5 is huge. If it works let me know and I will try the same. I would not hold my breath though. I just can't see it improving that much.
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Old 04-02-2013, 01:08 PM   #4
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I just heard about it today, something about multiple injection sprays/fogger type injector from Ford in comparison to Jeep's single spray injector.Better stomization
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Old 04-02-2013, 01:12 PM   #5
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sorry hit send by mistake.What I was saying is that the fuel is supposed to be more atomized therefor burned more efficently creating more hp and better milage.
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Old 04-02-2013, 01:13 PM   #6
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Plenty of threads on here about it and a good amount say there was a slight gain. Likely lots of placebo in there too though. IMO even if there is a gain of 5hp you're not going to have any seat of the pants difference and won't be worth the time or money. If your serious about adding power its all about gearing, displacement, and if you're handy forced induction.
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Old 04-02-2013, 02:00 PM   #7
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Thanks for input C.B. if I could get 2 extra mpg for $45 and an hour of work I feel the gains are worth it,considering my commute to work is 75 miles round trip. We'll see how it goes.
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Old 04-02-2013, 02:05 PM   #8
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I finally got my jeep so i really dont care about my MPG. I do like to mod my stuff. I would like to give this a try if it somewhat works.


Let us know.
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Old 04-02-2013, 02:08 PM   #9
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I've done it, and while I don't think there was any noticeable increase in MPG or power, my engine does run considerably smoother and I no longer have any misfiring/stumbling issues. As for why the 4.0 doesn't come with better injectors, the answer is probably cost.
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Old 04-02-2013, 02:13 PM   #10
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i would def be interested in this as well if it helps out that much.
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Old 04-02-2013, 02:28 PM   #11
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Really the only thing I've heard about them is the engine runs smoother. I wouldn't buy them as an upgrade, but if I needed new injectors for some other reason I'd probably get 4 hole injectors.
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Old 04-02-2013, 04:09 PM   #12
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The Ford 4.6L has a 269cc injector.. (bigger than the Jeep 4.0L injector.) Its technically making the cylinder Richer than stock AFR.... i don't see how it will give MPG or Horse Power...

Neon “703″ injectors are 4 hole and are known to atomization and burn better, making it run smoother at idle and efficiency.

Upgrading Jeep Cherokee XJ 4.0L Injectors | Morris 4×4 Center Blog
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Old 04-02-2013, 04:43 PM   #13
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Only way you are going to gain 3-5mpg with a fuel injector swap is if you happen to have an injector or two that is leaking. Also the power gains would only really happen if your current injectors aren't providing enough fuel at WOT around 4-5k rpm. Only way i see that happening is with major mods like a stroker with a different cam and ported head were alot of people do need bigger injectors.
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Old 04-02-2013, 10:08 PM   #14
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As for why the 4.0 doesn't come with better injectors, the answer is probably cost.
a 3-5 gain in MPG is HUGE. if that were possibly by just swapping injectors they would be all over it considering how the EPA is run. And as stated above me it won't happen unless you have something wrong previously.
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Old 04-02-2013, 10:26 PM   #15
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<watch this>


I'll bet if you install a CAI at the same time, the performance increase would be incredible.










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Old 04-03-2013, 06:03 AM   #16
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I usd the 4 hole injectors from Five0motorsports. I had an injector coil fail so I needed new injectors anyway. I can tell you that after the swap it Idles much smoother and the throttle response is better. I gained about 1-1.5 mpg increase. I also found it to have better low end torque, on hills I used to have to downshift I can now make it without downshifting. This is just my experience and I can't tell you whether my gains would be typical or maybe my old injectors were worse off than I thought.
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Old 04-03-2013, 04:34 PM   #17
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a 3-5 gain in MPG is HUGE. if that were possibly by just swapping injectors they would be all over it considering how the EPA is run. And as stated above me it won't happen unless you have something wrong previously.
I clearly made no claims to an increase in MPG or HP. Again, like the poster above, my Jeeps that have made this swap run smoother and don't have misfiring issues. I hear a lot of doubters that are perfectly fine with the way their Wranglers run, and that's great! Wranglers in general are the epitome of simple and cheap (to produce, that is!), and it should be no surprise that multiplied over the production and sales of hundreds of thousands of them, that cheaper injectors would be used.

After all, why tinker with anything all you naysayers? I guess if it doesn't make the Wrangler taller or look cooler, then modification and improvement has no value?
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Old 04-03-2013, 06:53 PM   #18
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... or look cooler, then modification and improvement has no value?
If it is to "look cooler" then I'm sure you'd have the ever so witty "nice mall crawler" remark as well...


...
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Old 04-03-2013, 08:14 PM   #19
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If it is to "look cooler" then I'm sure you'd have the ever so witty "nice mall crawler" remark as well...


...
...and your point is? Nothing wrong with a nice mall crawler. That's not even what we're talking about here. When a person asks about making an upgrade, it's funny how everyone that hasn't tried it just loves to chime in about how pointless it is. I've yet to hear one person that has tried this and noticed no improvement though
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Old 04-04-2013, 07:58 AM   #20
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Sounds like an easy way to smooth out your engine with no negative side affects with some possible gains.

Thanks for the thread. If or when my injectors need replacing I will definitely consider this.
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Old 04-04-2013, 09:19 AM   #21
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Injectors will never make hp or mpg unless you already have problems with your current injector. Most engines will inject the fuel on a closed intake valve and use that heat for extra vaporization.
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Old 04-04-2013, 12:53 PM   #22
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Sounds like an easy way to smooth out your engine with no negative side affects with some possible gains.
I have installed Bosch 4-hole injectors on two 4.0L engines. Both exhibited significant improvement in overall smoothness and acceleration.

In one case, my 22 year-old daughter drove the vehicle after I had installed the new injectors. She had no idea what I had done, other than I had the hood up. She came back and said "I don't know what you did to my Jeep, but it sure runs a lot better now." Considering that she isn't exactly "in tune" with automotive concepts, the fact that she noticed says something.

That particular vehicle had been extremely sensitive to the first bit of pressure on the gas pedal. The new injectors eliminated that issue completely.

In all fairness, I might have obtained similar results with any new injector set. Didn't try new OE injectors, so I don't know.
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Old 11-23-2013, 06:52 PM   #23
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SO which injector and where do we buy them
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Old 11-24-2013, 12:13 AM   #24
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I got my ford injectors from precision auto injectors. $200 and two days later I had them in my hands. I'm not sure that any mpg's will be gained but my 4.0 runs and drives much smoother. I needed new injectors as I had a leaky one. They are plug and play and take about 20 min to instal. I really think I would have had the same result with new OE injectors.
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Old 11-24-2013, 09:58 AM   #25
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...I really think I would have had the same result with new OE injectors.
This.

I've read through many of these threads. The fundamental problem in all of them is that we never really fair get a comparison between the "upgraded" injectors and new clean oem injectors.

I do have a suspicion that a select few of these "performance upgrades" actually do provide small gains and can add up to a measurable improvement. The problem is identifying which ones are real. However, even if one can parse out the correct modifications on the first try, the time and costs will still quickly outweigh any benefits.

A true CAI, for example, offers a real but minor increase in milage and power. The problem is that it will be years before I recoup that $150+ it cost me to build. I tell myself that I did it for other reasons, which is mostly true!
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Old 11-24-2013, 01:41 PM   #26
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The ones you want are either 5.0 ford injectors, or neon injectors. Search "jeep 4.0 Bosch 4 hole" and choose one. I don't know if they helped, since they were put in while everything was being transferred to my stroker, but I feel like they helped. I used 24lb/hr
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Old 12-05-2013, 09:17 PM   #27
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To sum up what everyone here seems to want to argue about...
It WILL improve performanc and mpg. hands down.
Lets answer a few questions..
1: Why didnt they put 4 hole injectors in the Jeep 4.0L stock?
A: simple, they didnt exist. They were not designed till 1996.
2: How will it improve my hp?
A: Going from stock 18lb/hr injectors to 19lb/hr will improve it right away, then add in the technology of 4 hole spray instead of single hole, this allows the fuel and air to fix in the intake much easier and quicker. Less raw fuel in the cylinder the better. Thats wasted fuel.
3: whats the verdict?
A: Either the new injectors are in fact more efficiant and much better injectors, or they are atleast as good as OEM injectors. Unless someone with a dyno and a brand new set of both tests them we will never know.

Now to me, it doesnt matter if they are exactly the same or not $280 for OE injectors versus $220 for the Accels I bought is worth it alone, if I get performance and MPG out of it then so be it, if not then i bout a pair of injectors that will be AS good as the OE and paid less.
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Old 12-05-2013, 10:48 PM   #28
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There's no denying that there is an improvement over the single hole stock injector. The lb/hr rating really doesn't have anything to do with it. The injector only get what the fpr and pcm call for. That's why when the mustang guys ALWAYS match their MAF, injectors, and tune. The improvement from the 4 hole is better atomization. It does a better job at evenly "misting" fuel in the cylinder, where the stock single hole just pisses a stream. There is debate about the factory design helping to cool valves, but imo, that's not really a big concern. Main thing, improved efficiency. The more efficient a motor is, the more power, mpg', and longetivity it will have. The 4 hole is more modern technology, and the spray pattern is consistent, which will make the most out of every molecule of fuel sprayed. A less atomized spray pattern will be harder to completely burn. The unburnt fuel isn't transformed into energy, so it's wasted. The raw fuel will be pushed out of the exhaust valves and slip past the rings. IMO, the big noticable gains some guys are noticing are not just from the fuel being better burned, but from going from an injector with 100k+ miles to a new/rebuilt flow matched unit. Like I stated before, I don't really know what my 4 holes added, or what it helped, but i am getting a better idle, and better mpg's then with the stock injectors in the stock motor. Im happy with the fact that im making the most energy out of my fuel, instead of burning 3/4 and dumping the rest out of the exhaust. Also the flow rate doesn't make a difference by going bigger. 19lb/hr is the max rate it can move fuel. Its not moving 19lb/hr 100% of the time. Its controlled by what the pcm calls for. You can put 48lb/hr injectors on a stock motor and get no gains whatsoever. Especially the misconception that it will use more fuel for normal driving. That's just saying the injector can deliver that amount of flow, but only if that amount is available. Your pcm will still only call for 19lb/hr worth of flow. The pump provides the pressure, the fpr regulates that pressure, and the pcm tells them when to open and close. If the pcm tuning stays the same, nothing is changing. Similar to putting a 4" catback on a stock jeep motor. Just because it can flow enough for 600hp, doesn't mean the motor can suck that much air in
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Old 12-06-2013, 12:11 AM   #29
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To sum up what everyone here seems to want to argue about... It WILL improve performanc and mpg. hands down. Lets answer a few questions.. 1: Why didnt they put 4 hole injectors in the Jeep 4.0L stock? A: simple, they didnt exist. They were not designed till 1996. 2: How will it improve my hp? A: Going from stock 18lb/hr injectors to 19lb/hr will improve it right away, then add in the technology of 4 hole spray instead of single hole, this allows the fuel and air to fix in the intake much easier and quicker. Less raw fuel in the cylinder the better. Thats wasted fuel. 3: whats the verdict? A: Either the new injectors are in fact more efficiant and much better injectors, or they are atleast as good as OEM injectors. Unless someone with a dyno and a brand new set of both tests them we will never know. Now to me, it doesnt matter if they are exactly the same or not $280 for OE injectors versus $220 for the Accels I bought is worth it alone, if I get performance and MPG out of it then so be it, if not then i bout a pair of injectors that will be AS good as the OE and paid less.
Increase in mass flow rate makes ZERO difference. The computer controls injector pulse width and will supply the same amount of fuel no matter what.
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Old 12-06-2013, 12:44 AM   #30
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Increase in mass flow rate makes ZERO difference. The computer controls injector pulse width and will supply the same amount of fuel no matter what.
And at what point did I say it would add fuel?
That's right I didn't. I said that the 4-hole design is much more efficient. I know that the PCM controls the flow. A tune would be the only way to change this.

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