Better Fuel Injectors?? 4 hole VS 1 hole 

4 years ago, would have expected that update by now!

I put the 4 hole injectors in my '98 XJ 4.0. They are just amazing. The XJ runs smoother, starts quicker and I am definitely getting better millage. I used to get about 170 miles from a tank of gas, now I am get like 230miles from a tank! Very nice

I've seen like a dozen of these injector upgrade video's and no one has done an MPG update like they say in the video.

I port matched my intake manifold with a Felcro gasket and installed a set of 4 hole injectors and experienced excellent throttle response and increased power.

Ive seen a video of dyno results going from stock injectors, to 4 hole, to 12 hole on the jeep 4.0, The 4 hole gave the biggest overall hp improvement, the 12 hole gave just a little less hp compared to the 4 hole, however the 12 hole added more torque than the 4 hole. With that being said, the stock injectors had atleast 150k on them (i forget the mileage, it was a jeep XJ), after the 1st dyno w/ stock injectors, he swapped in the 4 hole and did another dyno run, then swapped in the 12 hole and did the dyno run. The ECU and adaptive memory did not have any time to learn the optimal characteristics on how to go about controlling the new injectors. With my experience, the 4.0 needs to do a few complete drive cycles to get the overall best mpg and performance. When I first installed my 4 hole injectors roughly 8 or 9 years ago, first test run i noticed a smoother idle, much quicker pedal response, and quicker pickup off the line, however just about the same fuel mileage (leaning in the direction of a tad more fuel being used per tank, but not much). After a month of having them in, i checked again, and thats when i seen the big increase per tank. I forget the exact numbers as this was almost 10 years ago, however i know i get a minimum 400 miles per tank at a 50/50 split of city and highway/backroad driving. When i did the tests, it was mainly highway and backroad driving to work and back ever day, somewhere around 45miles/45minutes 1 way with less than 10min city driving. 2003 4.0 WJ, K&N FIPK, Bored Throttle Body, 4 Hole Injectors, Doug Throley Headers, Hi Flow Down Pipe w/ Pre-Cats, 2.5" Exhaust, FlowMaster 70, 3" IRO Lift, Stillen Brake Pads w/Drilled Rotors, Superchips Tuner, 32" DuraTrac's, 3.73 Vari-Lok Axles, NV242HD Selec-Trac Transfer Case. And a few other things. Stock, it was 2WD/RWD when i bought it in 2009. Next plan is to do the stroker rebuild on the motor :)

I ran the 4 hole on my 99 XJ Cherokee and there was a very noticeable power gain at low and mid range power. MPG seems to be the same. I do have a header on my 4.0L which benefits as well.

I swapped my injectors to 4 hole ones from a Dodge Neon. My smoother startup is likely because the 4 hole injectors were clean. The one hole injectors spray into the back of the valve so when the engine heats up, the nebulization should be fine even though it's one stream. Cold starts may be better off with the 4 holes. The flow volume of the 4 hole injectors were close enough to the stock ones such that the ecu can trim to what it needs. My 2000 XJ 4.0L with the A4 transmission gets 22mpg on the highway if I go 65mph. It's stock build with 130k miles.

One of the best mods I have ever done on my 91 4 cyl wrangler. Runs smoother, better power and 15 miles to the gallon. All good.

I went with 4 hole injectors on my V8 ZJ. I saw about a half mpg improvement and smoother idle. I really think the mileage boost was more from "new" injectors compare to the original one's with 247k miles on them. I would still recommend the upgrade as if I'm going to replace an item I would rather take the opportunity to do an upgrade.

I love watching the videos. Very informative. I'm about to change out my injectors. Are you happy with the 4 hole and would you have done anything differently.

I'm currently running and have been for the last 6 years on my '93 ZJ. You may also consider the adjustable fuel pressure regulator from Hesco. Better fuel pressure makes those atomize better at a higher psi. Earlier models ran 35-39 psi, but after '96 they went to 49 psi.

wanted to see the spray patern like we saw with the single hole injectors you had

I like your videos direct and to the point I have a 91 YJ rotors pads calipers master cylinder lines and I still have a spongy brake pedal any suggestions

Did you see an improvement with the gas mileage??

4 Holer, 6 banger POWER!

Went from stock 1 hole to 12. Startups are way quicker and instant. Idle and general acceleration is much smoother with maybe a mile per gallon increase.

I'm caught up into a predicament on which fuel injectors to go with I have both the single and the four hole

Did you have these flow balance? Might want to do that, seen these Amazon ones are poorly flow matched.

Cool video bro 👏👏👏👏👏💯😎

Btw awesome channel 👍👍👍 what are the pros n cons of a spacer for a Throttle body? Have you already done a vid on this question? Pl ty

I have 200,000 miles on my oem injectors. Runs great. I use injector cleaner once a month.

Do you have any insights as to why you selected these particular injectors?

I went with K suspension for mine

Any update on the performance and MPGs after installing 4 hole injectors?

smaller injector holes clog easier so your car may run better for the first few weeks or few months but after that the injector with the small holes may clog and u will have problems all over again . i just bought a replacement injector with 4 tiny holes that can barely be seen unless u use a magnifying glass and i am not gonna install it but i am gonna exchange it for an injector with a larger single hole to insure no clogging for many years .

Hello, I have a yj 2.5 4 cilinder from 1991. Do the injectors used in the video fit's for my jeep ? Thanks in advance. All info is welcome. Greetings from Belgium

did you find out if MPG was better? or did it just make it run smother?

i got a question if I have oem injector 1pin hole @ 243.8cc p/m and swap for 4pin hole 232.1cc p/m, will the 4pin hole spray more fuel than the single pin hole?

Do you have a link for these 4 hole injectors for a 2005 Jeep TJ Rocky Mtn 4.0?

Hi. I have a 2000 wj 4.0 I just replaced my fuel injectors with a 4 hole from a one hole, now im getting a code po172 and po175 bank 1 and 2 oxygen sensors, system too rich. Would this be normal for the ECM to reset for the new injectors after driving a bit, or is my fuel pressure regulator not adjusting to the new injectors? I replaced my fuel filter 2 years ago. Not sure if its a regulator fuel filter type?? Isn't my regulator on the middle of the fuel rail?? Thanks.

Mine clogged after a week but my rail was a bit dirty lol second time may last longer lol

Did you get any boost from the 4 hole?

Is it ok from two hole to replace with one hole? That's how I got them when I ordered

So how come the picture of the Amazon ones you list have clip slots?

Do I have to change the Fuel Pressure Regulator

Is there a range of quality and or performance in these injectors made by different manufacturers. If so, which is best? I have 2 YJ s and an 05, all six cyl. Can anyone please advise…..thanks

Wondering if you can give an update? I am very cautious when purchasing some items on Amazon (unless is name brand) and injectors would be one of those items especially since I know a well known or reliable injector is much pricier than these. Did they perform well and are you still using them or have to replace them? I read reviews and saw that many people had issues with them so wanted to ask how they performed and get your overall opinion.

Hey why haven't you done the 99 intake upgrade

Any update on the performance of your Jeep with the four hole injectors? I am considering the mod myself. Also, do you think that there would be any advantage with going straight to the 12 hole model?

Not the belt, just a tensioner pulley. Always turn key to on position and give it 2-3seconds to pressurize your rail. It will start faster evertime. Also, when replacing injectors, pull fuel pump fuse and start and let run until it dies. Shouldn't be much fuel left in rail after that! Don't pull injector fuses! Lol

What is the part # for a 4.0 cherokee 92

Did it work or its bad injectors ?

So any benefit to the injectors aftera few years?

Did you select a fuel rate equivalent to the one hole? I just put in 4 hole injectors. They are rated a bit more flow at a bit less pressure. It runs fine, but hard starting sometimes. Thanks for the vid.

What's the name of lubricant? Is it ok WD or Vaseline?

Hello, I wanted to enter the link to buy the injectors and it does not work, you can support me with the description or the link, thank you very much, excellent video

Did you get the 20% fuel economy boost?

did you see an improvement . will it help my 95yj 2.5 how much for a jeep solid garage decal iwant to put it on my 95

My results, ran like a dog would actually stall out sometimes. “Cleared” the ecu, my biggest problem is getting the engine warm enough, new fan cleaned out the block really well (lots of hot flushes) and a 185° t stat. I think I’m stuck in closed loop ( or is it open?) not reading off of the 02 sensors. Went back to oem injectors. And they seemed more responsive. I ohm’d all 12 out and old were 14.7 new 15.9 all +\- .1 of an ohm I need to flow test the new ones make sure they spray clean. Ran the new ones 150 miles on a 24 mile loop back and forth on a road didn’t improve. Kinda bummed 🙁. I’ll get supplies to flow test/clean them.

I just now discover this. I have over 750k miles on my 94. That’s right, 750k. I bet I could use new ones.

Careful with ebay and Amazon new injectors they could be cheap knock offs that actually sometimes make your engine run worst i know from experience. I ended up buying my reman ones from rock auto. I ordered them for a 2001 volvo c70 2.4l turbocharger. They fit the jeep 4.0 and they are ev1 connectors with 4 holes and same flow rating as oem ones.

Have you done a updated video yet??????

The problem with aluminum rails they oxide. If you use a fine wire bottle brush. Chuck it up in a very slow drill motor and buff out the injector holes in the fuel rail. A little spit on the o-ring and they slide in with ease.

I know I'm returning to an old video, but I replaced my 94 yj with 4holes, but now it will crank with no start up. Right after I replaced them it would fire up, after turning it off and leaving it, it won't now. Any ideas?

Been contemplating this upgrade. Sounds like we're going to the same school, Dale. My only question/concern is - wouldn't these smaller holes clog up sooner with varnish build-up than the single-hole injectors? Or does that really matter, in the long run?

Do you suggest the fuel injectors you have in the subscription or should i get something more reliable? How have they worked for you is a netter question?

Is this the engine you rebuilt? And you should do a longevity review of these after a few months and see if they have clogged up or anything

Can you post the link where you got these please 4 hole injectors

Hello, I made the 4 holes injector upgrade and the performance change its awesome, is there anything more that can be done to improve the ride performance or engine performance?, what you think about the throttle body spacer?

What kind of lubricant for the injectors?

How did these injectors end up doing? Im skeptical about ordering due to the mixed reviews.

I forgot to add new shoes and spring kits in the rear and wheel cyl

Did this 4 months ago and the jeep does start quicker and runs smoother but did not see mpg gains , also noticed top speed increase (98 tj sport )

Atomized!

Did you ever have problems with these? Did your fuel economy improve?

You are not going to see a significant increase in gas mileage. The engine will idle and run smoother. New injectors are a great idea anyways if they are the originals. Keep in mind that the only filter in line on most models is on the intake inside the tank. If you question your fuel at all an inline filter is probably a great idea especially going to a smaller hole on the injectors. My 99 XJ with Pacesetter header & 2.5" exhaust (no crush point behind the manifold) and 4 hole Mustang injectors now pulls strong from 60 to 90mph and easily spins the tires (255/55/18) from a start.

Always lube before inserting in tight place, don't want to tear an "O" ring😉

That did not work for my jeep 2001 had to put back the olds ones it was berning gas like hell and dont now y

Help please, I'm a military vet and looking for a reputable place online that sells quality, non China knock offs, dynamically tested (besides matched based on peak flow alone) 4 hole Injectors for my 93 Jeep GC Laredo I6 4.0. It would be so appreciated if anyone could help me in this manner. Thx all.

Better I don't know most time injectors removed are used maybe dirty " restricted" new is definitely better though my 2 cents

Six Jeep injectors $60. Six Cummins 6.7 injectors $2200. Out looking for a jeep!

Ummmmm Dale.... I believe you were supposed to remove the lil white plastic rings that were on the outlet 4 hole side...I'm pretty sure they are just there to hold the o-rings in place during shipping... I'm actually doing mine tomorrow with those same type. I tried to do mine a few weeks ago, had it all the new ones in the rail and went to insert them onto the ports...and they didn't fit. Turned out they sent me the wrong part number. I had to reinstall my old ones, after cleaning them up a bit... They resent me the same as you now, the right part number now. I've already removed my white rings. Just used a pair of needle nose pliers to pop them off... I'll update ya about the removal of those white plastic rings... Please, please, please check for leaks around the mating surface between the injector and the head... I'd really hate for all your work to go up in flames my friend...

I upgraded to 4 hole on my f150 and check engine light won’t turn off

I just put 12 hole injectors in my WJ I can’t tell the difference from the 4 hole injectors

Great fuel injection swap out but why didn't you show the fuel injectors after you started it up they could be leaking? Also you should have shown the inside of the fuel rail there could be a lot of corrosion and rust in there that might need to be cleaned.

Someday I will see if this most improves gas mileage. I don't have a Dyno.

👍🇺🇸

Update? I hear Amazon injectors are crap

Shouldn't title be 4 hole vs 1 hole?

Hi, Dale! So the question everybody seem so curious to get answered - did it help improve your MPG?

Wait where is Project Fungus going??

Most of your single hole injectors actually spray a cone shaped pattern…

my result: more smooth, MORE throttle, +~40 km milegage 2004 Wrangler TJ Sahara Unlimited, GCC specs, Dubai. I was afraid to try 4holes. buy bought on ebay set of 6 BOSCH 4 holes injectors. Ill like to say that You should reset computer before engine start. result: more smooth, MORE throttle, +~40 km milegage

Dyno or bust. Won't make a difference.

..... My smog test will be due in a couple of months in California... I've got an '88 Comanche, manual, 4.0 ... Any idea if the four hole injectors will affect the smog either way... + / -- ? ... Presently one injector is weeping a bit... So, I figured it's time to replace them all... And not just a new O-rings on the weeping one..... 🤔 ... 🧐 ... 😵‍💫 ... 🇺🇸 .....

Did it improve the fuel economy?

So did it increase you MPG by 20%? Did you check?