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Unread 09-16-2013, 10:51 AM   #1
2004DUB
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2004 WJ 
 
Join Date: Sep 2013
Location: Philadelphia, PA
Posts: 14
Wj 2004 Jeep WJ bosch injector upgrade

I have been skimming the forum for quite some time now but finally decided to make a post.
I finally pulled the trigger on the 4-hole fuel injector upgrade on my WJ with 156,000 mi
and I sure am happy I did. I ended up getting them from flamethrower (injectordyne) on ebay.
The swap went easy after lubing the o-rings up a little and cleaning out the fuel rail.
As soon as I started the engine and rev'd her up a few times I noticed a smoother idle right away. Its not perfect but my water bottle doesnt shake in the cup holder anymore.
After the first test drive I noticed a tiny bit more power going up a few hills I drive every day that are long and steep, and a little better throttle response.
I cant say for sure yet If I have gotten better gas mileage but Im keeping track of it all week to see if I can get above 16mpg.
I will put an update up in a few days.


Last edited by 2004DUB; 09-16-2013 at 03:30 PM..
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Unread 09-16-2013, 12:40 PM   #2
silentbob21
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not bad, my injectors are probably getting close to needing a refreshing... might have to just upgrade try and help the 4.0 out a little

keep us posted
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2004 WJ SE 4.0L I6, NV242, IRO 6.5 LAs D44a Spartan locked, 4.88s, BFG KM2s 35/12.5/15


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Unread 09-16-2013, 01:10 PM   #3
TeXJas
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I've bee running them for over a year and I can sure tell the difference. I haven't really gained any milage maybe 1-1.2 mpg, but I also changed the fuel filter too. I can tell the difference in the idle and that's what bugged me the most.
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Unread 09-16-2013, 03:03 PM   #4
2004DUB
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The difference in idle and response is amazing. I didnt think I would really see that much of a difference. Once I run this for a week or two next step is the hypertech programmer and an intake to see what I can really get out of this 4.0l on 89 octane.
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Unread 09-16-2013, 03:24 PM   #5
DustinWJ
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How much they run you.. Got a link to them ?
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Unread 09-16-2013, 04:19 PM   #6
2004DUB
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These are the ones I got http://www.ebay.com/itm/Jeep-Grand-C...0172ae&vxp=mtr
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Unread 09-16-2013, 04:34 PM   #7
Overland03
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2003 WJ 
 
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Hi there - New member on this site. v8 Overland

This injector is also recommended by some - US $ 12 from China - Alibaba - US $ 44 from Fiveomotorsport.
Type: Injector Nozzle ; OE NO.: 4L8E-A4A ; Size: Standard ; Car Make: Ford ; Model Number: 53032145AA - see pic's

Any suggestions please.

How has your upgrade been performing?

Leon
inj-4l8e-525-partno_600.jpg

4l8e-300_8_600.jpg

4l8e-a4ab_600.jpg

2003-jeep-cherokee-overland-4-copy.jpg

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Unread 09-16-2013, 07:27 PM   #8
abposromcath
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What Bosch part number did you use? Have been trying to find injectors for my 2004 WJ 4.0. Found a good chart, but it only lists up until 2001.
injector-1.jpg  
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Unread 09-17-2013, 12:23 PM   #9
2004DUB
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I will take a look and see what part number is on the injector body. I just bought em and threw them in lol
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Unread 09-17-2013, 05:52 PM   #10
Locutus
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can one of you point me to a video or schematic showing how to change the injectors?
TIA
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Unread 09-18-2013, 02:31 PM   #11
Locutus
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Bueller?
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Unread 09-18-2013, 02:52 PM   #12
mikeyc1821
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is there a benifit to this in a 4.0 if the factory ones seem to be working fine? More power?
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Unread 09-18-2013, 05:10 PM   #13
abposromcath
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Quote:
Originally Posted by mikeyc1821 View Post
is there a benifit to this in a 4.0 if the factory ones seem to be working fine? More power?
Most people claim a small power/mpg increase. The replacement injectors have four spray ports as opposed to the one port on the stock ones. This creates a more uniform spray for allegedly better combustion. I definitely want to try it but can't get confirmation on an exact part number (either Bosch or Ford) for 2004 4.0L WJ.
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Unread 09-18-2013, 05:30 PM   #14
mikeyc1821
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i aswell have an 04 4.0l
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Unread 09-18-2013, 05:53 PM   #15
2004DUB
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Sorry I haven't put a part number up yet I cant see the number by just rotating the injector, I have to pull one and don't have time to pull the fuel rail off again right now. I know one ebay seller listed a bosch number but I don't know how accurate it is. After a few days I am more than happy with these things, Its not that noticeable as far as an all out power gain. It feels like it has more pep to it and the acceleration is much more smooth. I am keeping an eye on fuel and after 85 miles I haven't used a quarter tank up yet so if this keeps up I am one happy WJ owner!
As far as the install its pretty easy as long as you remember to put a little lube on the injector o-rings. The guy I got them from offered instructions but I have taken the fuel system apart more times than I can count when I used to wrench on these for a living. All you really need is a flat head screw driver a 10mm socket with extension a 13mm socket and some rags for the gas that comes out of the rail.
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