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Injector upgrade for the 4.0L, $139 for all six injectors
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Author:  dieselenthusiast [ Thu Jan 27, 2011 11:05 pm ]
Post subject:  Injector upgrade for the 4.0L, $139 for all six injectors
Bosch injector upgrade with a 4 hole spray pattern for better fuel atomization. The results are more power, smoother running engine, and better fuel economy. :rockon:

Click the link below to watch the video:

http://www.precisionautoinjectors.com/p ... tegoryId=3

Buy here:

http://www.precisionautoinjectors.com/c ... tegoryId=3
Author:  kskj [ Thu Jan 27, 2011 11:18 pm ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
Looks good.Let me know how it works.
Author:  dieselenthusiast [ Thu Jan 27, 2011 11:27 pm ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
kskj wrote:
Looks good.Let me know how it works.


There are dozens of people running them over on the NAXJA forum. They work as advertised and the customer service is second to none. Image
Author:  JJsTJ [ Sun Feb 13, 2011 12:53 pm ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
did you try them yet? hearing mixed reviews on them so far. early reports had them sounding like it wasn't worth the hassle w/ many not working properly though the vendor took care of swapping them as needed. wondering if they sorted them out and have the problems fixed?
Author:  dieselenthusiast [ Sun Feb 13, 2011 1:16 pm ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
JJsKJ wrote:
did you try them yet? hearing mixed reviews on them so far. early reports had them sounding like it wasn't worth the hassle w/ many not working properly though the vendor took care of swapping them as needed. wondering if they sorted them out and have the problems fixed?


No, I haven’t tried them yet. I’m waiting on my next UOA before I make any decisions. If I have high levels of fuel in the oil again, then I’ll swap injectors. If I have minor fuel in the oil at the 3 month interval, then I’ll just make 3 month oil change intervals. I’ll add them to my new engine when that time comes.

Here are two quotes that may help answer your questions. This quote is from Precision:

“I know it can all be very scary at first but fuel injectors and their works are very simple actually. It's an electromagnetic valve basically which opens and closes based on the computer's signal. The fuel goes through the injector and when the valve opens (plunger gets pulled back when the coil energizes) the fuel flows around the plunger and down into the nozzle (bottom end of the injector). The nozzle disperses the fuel into it's particular pattern. These nozzles are a different variety so they flow a more atomized pattern than the factory counterparts. That's all it is. Same flow rate, different spray pattern. If you get any problems with these like a hard start or anything at all, call me or email me. I don't expect you to, however one in every 50 orders or so for these injectors gets a hard start. Basically a nozzle seat gets a flash of corrosion and the seat doesn't seal properly anymore. The fuel drips into the cylinder once the Jeep is shut off and when you start it up, it takes 2 turns of the key to get it start so that all the fuel gets pushed out (like in the old carb days). It's just one of those things that no matter what measures we take it seems to still pop up. Dirty injectors don't have this problem since the layer of gasoline deposits protects the metal surface from oxidation. Go figure ;)”Another quote from NAXJA:

“He also mentioned that he is investing in a new solution to hopefully solve this issue, which while is not overly common, is "more common that I would like...".
Author:  Rock Lizard [ Sat Feb 26, 2011 6:09 pm ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
Did you get these yet?
Author:  dieselenthusiast [ Sun Feb 27, 2011 12:31 am ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
Rock Lizard wrote:
Did you get these yet?


Not yet. I’m pulling an UOA next weekend, which puts me near the 90 day mark on this oil chance interval. If I have fuel in the oil, then I’ll be ordering them.Image
Author:  j-rod [ Tue Apr 26, 2011 8:22 am ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
FWIW.....dodge neon injectors are a direct upgrade and plug in too.

most places sell refurb for under $60 shipped for a set of 6.
Author:  dieselenthusiast [ Fri Mar 23, 2012 12:17 am ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
j-rod wrote:
FWIW.....dodge neon injectors are a direct upgrade and plug in too.


And from my understanding, the 1999 - 2001 XJ models will take the Neon 784 injectors, which is an “upgraded” injector.

j-rod wrote:
most places sell refurb for under $60 shipped for a set of 6.


You are correct. I can get a set of the 784 Neon Injectors shipped for $60. These injectors have been disassembled, soaked, blasted out, and tested electronically and mechanically with replaced micro-screens. Not a bad deal, eh? Tempting....... :mrgreen:
Author:  DirtyKK [ Fri Mar 23, 2012 12:22 am ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
For anybody looking at this mod. I got the remanufactured neon injectors and noticed a gain of .5 mpg or 5% increase in fuel economy.
Author:  dieselenthusiast [ Fri Mar 23, 2012 12:32 am ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
DirtyKK wrote:
For anybody looking at this mod. I got the remanufactured neon injectors and noticed a gain of .5 mpg or 5% increase in fuel economy.


Did you get the Neon 703's?
Author:  DirtyKK [ Fri Mar 23, 2012 1:54 am ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
dieselenthusiast wrote:
DirtyKK wrote:
For anybody looking at this mod. I got the remanufactured neon injectors and noticed a gain of .5 mpg or 5% increase in fuel economy.


Did you get the Neon 703's?


Sounds right. Whichever ones are direct fit for my 93.
Author:  dieselenthusiast [ Fri Mar 23, 2012 2:04 am ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
DirtyKK wrote:
dieselenthusiast wrote:
DirtyKK wrote:
For anybody looking at this mod. I got the remanufactured neon injectors and noticed a gain of .5 mpg or 5% increase in fuel economy.


Did you get the Neon 703's?


Sounds right. Whichever ones are direct fit for my 93.



Yeah, the 703's are a direct fit on your application. If I understand correctly, the 703 and 784 are the same injector. The only difference is that you would need the adapters to run the 784’s on your application whereas the 784’s are a direct replacement for the 99-01 XJ’s.
Author:  dieselenthusiast [ Fri Mar 23, 2012 9:49 pm ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
Well, I decided to go with Chrysler 007 injectors from the 3.3L Dodge/Chrysler mini-vans. They are newer 4-port (lower mileage) injectors that replaced the 784’s after 2001. They flow the same fuel per minute as the stock Cherokee injectors. I paid $70 dollars for cleaned, reverse flushed injectors. They have also been electronically tested two ways, have new o-rings and micro-filters in the tops.
Author:  RED_KJ_666 [ Wed May 16, 2012 10:55 pm ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
Lots of guys up here swapping in 23lb/hr Mustang injectors with nothing but positive results.
Author:  dieselenthusiast [ Wed May 16, 2012 11:23 pm ]
Post subject:  Re: Injector upgrade for the 4.0L, $139 for all six injector
RED_KJ_666 wrote:
Lots of guys up here swapping in 23lb/hr Mustang injectors with nothing but positive results.


Do you know the flow rate? I was thinking those dumped fuel and were more rated for the stroker engine, but I could be wrong.
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