Injector Swap Writeup for the 4.0L - Page 6 - JeepForum.com
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Unread 09-26-2012, 01:10 PM   #76
misfit77
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1996 ZJ 
 
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hmmmm just opened my package from Precision...got rebuilt Chrysler single hole injectors. Called..no one answered. So far seems like a bad deal.

There goes my weekend project.

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Unread 09-26-2012, 11:06 PM   #77
misfit77
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many man many calls an e-mail and a web correspondance......nothing!

One more day and I am contacting Paypal.

There are other places to buy injectors.
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Unread 09-27-2012, 11:11 AM   #78
misfit77
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sorry to jack this thread...

Talked to the guy, I guess seeing 1 hole in the cap is not to be confused with having only one nozzle.

These are Seimens Chrysler, not Bosch.
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Unread 09-27-2012, 05:34 PM   #79
AmbuGrl
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Mine have 4 holes in mine.
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WTF is Clockspring??? my Jeep has digital clock
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Unread 09-28-2012, 12:13 PM   #80
misfit77
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Quote:
Originally Posted by AmbuGrl View Post
Mine have 4 holes in mine.
Are yours from Precision? I got Red Top Siemens Deca.
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Unread 09-28-2012, 12:32 PM   #81
dukie564
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If you don't SEE the 4 holes, they are not correct.

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1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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Unread 09-28-2012, 02:24 PM   #82
breakpoint
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Quote:
Originally Posted by dukie564 View Post
bad orings are most likely not the cause of your misfire code.

clogged injectors however might be. It'd be worth taking them out and soaking them in seafoam overnight and clean them up, then re-installing them with new orings.
Thanks to this thread, I was able to pull them and soak them...

Unfortunately, it didn't fix my problem. It was bad boots on the coil pack that was the problem. The spark was arcing out.

But with that fixed, and shiny clean injectors with new o-rings, I'm good to go!
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Unread 09-28-2012, 04:47 PM   #83
misfit77
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Dukie...thats a different brand at a minimum also your XJ is a 95, not 96-98...did you buy yours from Precision?
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Unread 09-28-2012, 05:11 PM   #84
64tbird
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Quote:
Originally Posted by robinz
I did mine a couple weeks ago using injectors from a Jeep Liberty 3.7liter V6. I have a 1990 XJ. I used this thread to inspire me to do the job as I have never worked on the fuel rail before. I also did a YouTube video to accompany this thread. http://www.youtube.com/my_videos_edi...id=Izj6q6o59L4

After everything was all said and done, I would add an asterisk on step #6, disconnecting the fuel lines. In my FSM it states that whenever the fuel line is disconnected, the o-rings should be replaced. I would recommend you have the o-rings on hand PRIOR to starting the job. I had a thread going over here with details on the o-rings; http://www.naxja.org/forum/showthread.php?t=1086841
Did you need resistors to run the 3.7l injectors? And which wire to which wire when you rewired to run them? I got a set from a 02 and they have been soaking in seafoam for months lol. I forgot about them
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Unread 09-28-2012, 08:37 PM   #85
AmbuGrl
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Quote:
Originally Posted by misfit77

Are yours from Precision? I got Red Top Siemens Deca.
No we bought them either in the classifieds here or naxja. They are neon injectors. Will double check the number in the am 784 maybe? I know the two sizes are 703 and 784 to use for the upgrade.
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I drive an XJ, and all of my power windows work :)



2000 Pontiac WS6 - DD
DD (Mine) Sold - 98 XJ Moss Green
(His) - 92 YJ December 2013 YJOTM

Sold - 95 ZJ
Sold - 97 XJ Red
Sold - 98 XJ


USN Jeep Club Hull #36
NAXJA #3700

Quote:
Originally Posted by RacerX View Post
WTF is Clockspring??? my Jeep has digital clock
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Unread 09-28-2012, 10:28 PM   #86
misfit77
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Quote:
Originally Posted by AmbuGrl View Post
No we bought them either in the classifieds here or naxja. They are neon injectors. Will double check the number in the am 784 maybe? I know the two sizes are 703 and 784 to use for the upgrade.
Thanks.

I hate to think I was ripped off.
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Unread 10-01-2012, 01:39 PM   #87
dukie564
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Quote:
Originally Posted by misfit77 View Post
Dukie...thats a different brand at a minimum also your XJ is a 95, not 96-98...did you buy yours from Precision?
No, I grab mine directly from vehicles in the junkyard. I've rebuilt about 10 sets for people - both the 703s (for 87-99 4.0s) and 784s (for 00+ 4.0s). Brand should not matter the upgrade comes from those 4 holes in the tip. If you don't have the 4 holes, you got screwed. Period.

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1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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Unread 10-01-2012, 09:35 PM   #88
billybooster2
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Can you use the 784 if u upgrade the regulator on a 93 4.0? Like grand caravan or similar?
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Unread 10-02-2012, 08:48 AM   #89
dukie564
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Quote:
Originally Posted by billybooster2 View Post
Can you use the 784 if u upgrade the regulator on a 93 4.0? Like grand caravan or similar?
it's not the regulator that changed, it's the electrical connector for the injectors that changed.

The only way to use the 784s on a earlier jeep is to splice in the newer style electrical connectors.
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1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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Unread 10-02-2012, 12:48 PM   #90
calvin196
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Thanks a lot for the post, I cleaned my injectors and fuel rail yesterday with a can of SeaFoam Deep Creep and a tooth brush, the fuel rail spewed out some nasty looking brown gunk thanks to the Deep Creep and the injectors had slight carbon buildup on the tips, I do notice a small improvement in acceleration and idle but nothing major as its just the same injectors just cleaned. I may buy some flow-matched refurbished 4 hole injectors from a guy on ebay but its $170 for 6 and I'm not sure if its worth it.
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