Originally Posted by buysellny

You gained two miles per gallon because your ORIGINAL injectors were shot.. JUST LIKE EVERYONE ELSE WITH CLAIMS OF MPG GAINS.

Originally Posted by buysellny

1. People are removing dirty, worn and intermittent spraying stock injectors and then installing 4 hole flushed and or rebuilt injectors and getting great results. If you rebuild the stock injectors FIRST they will work as good or BETTER and not create unkown conditions insidide the combustion chamber. Did you ever consider why chrysler did not put Neon injectors in the Jeeps to begin with back in the early 2000's?? I guess the army of engineers that work for chrysler during that time did not bother testing the injectors or comparing results with 4 hole vs single hole? You must consider what I am saying.. In 1999 Chrysler was using neon injector 4 hole and single hole in Jeeps for a reason. Wouldn't it be cheaper by MILLIONS of dollars for chrysler to use one style injector thats plug and play while improving MPG and preformance such ans the 784's or 703's in Jeeps?? Why not then?? Think about it and give me a reason that makes sense on that fact. And it's a fact.

Originally Posted by buysellny

2. I was told by more then one source that the style of intake manifold and the firing pattern Siemens Deka uses is made to preform BEST for the Jeep setup. Mine is a 2001.. The upgraded the intake manifold on these yet kept the same injectors. I was told by several sources who do injection for a living that the fuel inside these manifolds sits in some ready pattern and that the design and firing mechanizim will not benefit from atomized spray. In fact, I was told atomized spray will more then likely result in rich running Jeeps due to spray going places its not suppose to inside the chambering design. In other words its desgined to spray directly into the chamber for a reason.

Originally Posted by No4x4Yet

Do you relize the amount of time and money an automaker invests to something as simple as a injector change? They need to be certain its goin to work and not blow up engine and ruin a product that has worked great for years. The spend months if not years and 100s of thousands of dollars on R&D for anything they use. They would have already been busy with the manifold and cant change everything all at once.



If you knew anything bout the combustion process you would know that liquid gas doesnt burn well. The whole point of an injector; 1 hole or 4; is to atomize the gas so it can mix with the air and flow into the cylinder.

Think bout how fast and engine is operating and sucking in the air/fuel mixture at a few thousand RPM! BTW notice I said AIR?FUEL MIXTURE!! Not only is the idea of gas pooling in the rediculous and dangerous as Zach mentioned. But last time I checked a lil wind doesnt suck water up into it, if that were the case youd be soaked if you were near any body of water when it was windy. BUT THAT DOESNT HAPPEN!

And FYI Im an engineer and know the time and work require to make any sort of change to a product. The more products you sell the more testing your goin to do to make sure it works no matter what.

Originally Posted by buysellny

lol.. I know what I said sounds dumb.. You guys are getting all bent about it.. When i stated read mode in fuel.. its a specific design to the 4.0L engine and I more then likely did not comprehend what the injector guy was talking about.. I could care less really..

Everyone has mixed results and any claim of fuel MPG gains is a crock of bull.. fix teh stock injectors

Originally Posted by buysellny

As late as 2004 single hole were still being used. I am not sure whats going on now but anything must be better then whats in my 2001 Cherokee. Anyway, this is a good discussion. I am mearly posting what I found out with phone interviews and in person interviews with injector rebuilders. Here is why the argument that atomized spray patter in these jeeps make no big diffrence according to people who deal with fuel injection ona daily basis.

1. People are removing dirty, worn and intermittent spraying stock injectors and then installing 4 hole flushed and or rebuilt injectors and getting great results. If you rebuild the stock injectors FIRST they will work as good or BETTER and not create unkown conditions insidide the combustion chamber. Did you ever consider why chrysler did not put Neon injectors in the Jeeps to begin with back in the early 2000's?? I guess the army of engineers that work for chrysler during that time did not bother testing the injectors or comparing results with 4 hole vs single hole? You must consider what I am saying.. In 1999 Chrysler was using neon injector 4 hole and single hole in Jeeps for a reason. Wouldn't it be cheaper by MILLIONS of dollars for chrysler to use one style injector thats plug and play while improving MPG and preformance such ans the 784's or 703's in Jeeps?? Why not then?? Think about it and give me a reason that makes sense on that fact. And it's a fact.

2. I was told by more then one source that the style of intake manifold and the firing pattern Siemens Deka uses is made to preform BEST for the Jeep setup. Mine is a 2001.. The upgraded the intake manifold on these yet kept the same injectors. I was told by several sources who do injection for a living that the fuel inside these manifolds sits in some ready pattern and that the design and firing mechanizim will not benefit from atomized spray. In fact, I was told atomized spray will more then likely result in rich running Jeeps due to spray going places its not suppose to inside the chambering design. In other words its desgined to spray directly into the chamber for a reason.

3. I am running these recommneded in an aussie post. This is my thread on the results. I bought the best ones recommnded for my year XR3E sorry for typo.. See my post

https://www.cherokeeforum.com/f2/sin...-4-hole-62398/

4. Seafoaming the plugs: Seafoaming was teh best thinng I ever did to teh truck.. that and the 63mm throttle body and CAI. I was told by an ASE tech that they do this decarbonization procedure then change plugs for fouling. Ask a dealer if they change the plugs for decarbinazation.. Who knows.. I never changed them.. Mine dont take minute to remove.. I have a coil pack and its a bit of a process.. I have a 2001 which is a diffrent setup.. I have seen posts on here saying seafoaming fouls the plugs a bit..

5. Atomizing the spray will cause the chambering to leave some unburnt fuel. The trucks will run rich.. I got worse gas with brand new injectors.. Nearly everyone who changed injectors feels they run rich.. How do you find out? I wish I could figure it out.. I have my stock injectors rebuilt now and ready to go.. Turns out I needed two new ones for intermitent spraying. The Siemens Deka injectors are VERY bad with dirt according to more then a few injector rebuilders who say teh little pin wears on them as well and if dirt gets in at all the injectors fail.. They are good if kept clean, and real clean.. Also no shop i sent my stock injecotrs to would do a inionization cleaning.. they said it ruins the inectors??

Originally Posted by buysellny

lol.. I know what I said sounds dumb.. You guys are getting all bent about it.. When i stated read mode in fuel.. its a specific design to the 4.0L engine and I more then likely did not comprehend what the injector guy was talking about.. I could care less really..

Everyone has mixed results and any claim of fuel MPG gains is a crock of bull.. fix teh stock injectors

Originally Posted by freegdr

heres a thought maybe the reason they use the single hole instead of the four hole is less chance of it getting plugged up ,think about it up in the moutains 4 wheeling and injector plugs up??

Originally Posted by ZachsXJ

if you have a good fuel filter and dont buy cheap crappy gas that would very rarely if ever become a problem.

I think it boils down to the fact that in the early 2000s and 90s nobody cared about gas milage, the single hole injectors worked just fine so Chrysler left em alone. No point in fixing what isn't broken.

Originally Posted by buysellny

lol.. I know what I said sounds dumb.. You guys are getting all bent about it.. When i stated read mode in fuel.. its a specific design to the 4.0L engine and I more then likely did not comprehend what the injector guy was talking about.. I could care less really..

Everyone has mixed results and any claim of fuel MPG gains is a crock of bull.. fix teh stock injectors

Originally Posted by ZachsXJ

funny how once facts that you cant dispute were posted up you changed your tune awfully quickly. Do yourself a favor, get over your pride and admit you were wrong.

Its happened to me more than a couple of times, and from experience I know its better to admit you were wrong than make yourself look like an arrogant asshat.

Originally Posted by ivantheigor

Sorry if this question was asked, but I waded through the first ten pages, and didnt see an outright answer to this question.
What injectors will fit a 2000 4.0 without an adapter?

Originally Posted by jeepcherokee99

I have a 99 grand Cherokee limited stock 4.0. What injectors should I use to upgrade performance?