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 Post subject: Injector upgrade for the 4.0L, $139 for all six injectors
PostPosted: Thu Jan 27, 2011 11:05 pm 
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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

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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Thu Jan 27, 2011 11:18 pm 
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Looks good.Let me know how it works.

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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Thu Jan 27, 2011 11:27 pm 
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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

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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Sun Feb 13, 2011 12:53 pm 
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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?

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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Sun Feb 13, 2011 1:16 pm 
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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...".

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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Sat Feb 26, 2011 6:09 pm 
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Did you get these yet?


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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Sun Feb 27, 2011 12:31 am 
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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

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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Tue Apr 26, 2011 8:22 am 
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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.

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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Fri Mar 23, 2012 12:17 am 
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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:

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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Fri Mar 23, 2012 12:22 am 
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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.


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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Fri Mar 23, 2012 12:32 am 
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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?

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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Fri Mar 23, 2012 1:54 am 
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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.


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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Fri Mar 23, 2012 2:04 am 
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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.

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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Fri Mar 23, 2012 9:49 pm 
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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.

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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Wed May 16, 2012 10:55 pm 
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Lots of guys up here swapping in 23lb/hr Mustang injectors with nothing but positive results.


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 Post subject: Re: Injector upgrade for the 4.0L, $139 for all six injector
PostPosted: Wed May 16, 2012 11:23 pm 
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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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