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Unread 09-09-2009, 02:18 PM   #1
hvywt77
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what size injectors are stock for 94ZJ? Are '94'95 injectors the only ones i can use

i have a 94 ZJ with 134K hard miles on it 4.0L. it has a miss at idle. i unplugged injectors and found miss to be on 2nd cylinder. i pulled second plug and i have spark, the cylinder is dry and white so I do not suspect any valve issue. I think the injector is bad/clogged whatever. I can see from online parts store that i am looking for 94-94 4.0L injectors...$86 reman from parts store.
i know there are some reman ones on ebay.
here are my questions:

-what are the specs on the stock injectors? 19lbs? 34lbs?

-can i use comparably rated bosch style injectors out of say a ford car or something?

i am really trying to get by on the cheap and want to know what stuff i can use that i may have laying around...i appreciate your thoughts...

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Unread 09-09-2009, 02:55 PM   #2
rugermack
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If you want to get by cheap go to the junk yard.
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Unread 09-09-2009, 02:57 PM   #3
ratmonkey
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fords work, but are rated at 39psi while the jeeps are 49psi. jeep uses roughly 19lb/hr injectors in all zj's. there's some variation year to year. i'm pretty sure this is all in the faqs.
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Unread 09-09-2009, 03:11 PM   #4
LordHobbit
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For a stroker, a writeup I have says use 24 lb/hr Accel injectors. Doubt they're cheap though. sorry no part numbers or model numbers, just accel.
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Unread 09-09-2009, 03:25 PM   #5
HighLonesome
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Compliments of Dino Savva, 39 and 49 psi injectors don't interchange, and all 96-98 V8 and I6 injectors are the same. 4.7HO injectors flow the most, followed by 95 V8.
Quote:
2.5 I4:

'87 #83502578 ?
'88-'90 #83504851 ?
'91-'95 #53007232 ?
'96-'98 #53030778 23.2lb/hr @ 49psi

3.7 V6:

'02->> #53031099 24.0lb/hr @ 49psi

4.0 I6:

'87-'90 #53003956 18.6lb/hr @ 39psi
'91-'93 #33007127 21.0lb/hr @ 39psi
'94-'95 #53030343 21.0lb/hr @ 39psi
'96-'98 #53030778 23.2lb/hr @ 49psi
'99-'01 #04854181 22.5lb/hr @ 49psi

4.7 V8:

'99-'02 #53030842 22.5lb/hr @ 49psi
'02 HO #53032145AA 25.8lb/hr @ 49psi

5.2 V8:

'93-'94 #53007809 22.7lb/hr @ 39psi
'95 #53030262 24.6lb/hr @ 39psi
'96-'98 #53030778 23.2lb/hr @ 49psi

5.9 V8:

'98 #53030778 23.2lb/hr @ 49psi
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Unread 09-09-2009, 03:31 PM   #6
rm2001wj
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You can use this chart.
Quote:
4.0 I6:

'87-'90 #53003956 18.6lb/hr @ 39psi
'91-'93 #33007127 21.0lb/hr @ 39psi
'94-'95 #53030343 21.0lb/hr @ 39psi
'96-'98 #53030778 23.2lb/hr @ 49psi
'99-'01 #04854181 22.5lb/hr @ 49psi
A '96-'98 23.2 lb/hr @ 49 psi injector would flow slightly less than 21.0 lb/hr @ 39 psi so you could use '96-'98 injectors if you wanted to as long as they fit.
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Unread 09-09-2009, 03:35 PM   #7
HighLonesome
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I guess they do interchange if you know enough about injectors. I have a set of 8 I want to get rid of. PN 53030778 from a 98 5.9. PM if interested.
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Unread 09-23-2009, 07:59 AM   #8
hvywt77
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i got a used injector off ebay. piece of cake. took away the stumble. on to other problems...the guy has a couple more still for sale $9.99 shipped. here is a link
http://www.jeepforum.com/forum/f191/...ipping-862785/
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Unread 09-23-2009, 09:45 AM   #9
frankie_b11
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How difficult is it to change these out. I have a 97 grand with 153,000 that I am sure could use some new ones.


Thanks
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Unread 09-23-2009, 10:18 AM   #10
impuresoul2k3
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53030778 - Magnum 2.5, 3.9, 4.0, 5.2, 5.9L & 2.4L Injector - 1994-2002
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