4.2L Fuel Injection and Build - Page 14 - JeepForum.com

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post #196 of 620 Old 10-31-2011, 08:24 PM
94chb
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1989 YJ Wrangler 
 
Join Date: Dec 2009
Location: Whitwell
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hey thanks for everything, i finished my swap today and MAN WHAT A DIFFERENCE IN POWER. going from a 4.2 and auto to a 4.0 H.O. fuel injected and a ax-15. my jeep will spin 33's in 1st and 2nd. and bark 3rd.
during the winter i wanna pull my 4.0 out and drop the 4.2 crank and rods into it then set it back into my jeep.
ive got a build thread

http://www.crossedup4x4.com/apps/for...-mean-wrangler

oh and i ended up sellling that ub and frame for $500 with clear title. so i didnt have anything into my swap.

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post #197 of 620 Old 11-05-2011, 10:47 PM Thread Starter
cevans87
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awsome man, glad to hear it !!!

Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
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post #198 of 620 Old 11-05-2011, 10:48 PM Thread Starter
cevans87
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got 1 or 2 more things to get for the tranny swap, and then i will be starting that in a week or two as long as nothing else comes up in life, oh and I found out i'm about to be a dad again !!!!

Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
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post #199 of 620 Old 11-06-2011, 06:47 PM
unclewilson2
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been working 60 and 70 hours a week ! hope to get on my jeep this weekend !
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post #200 of 620 Old 11-07-2011, 06:12 AM
wanabejeeper
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Cevans87, I recnetly replaced the 4.2 in my rig with a reman. I plan on doing the 4.0 HO head with mpfi swap on to my 4.2 about 2 years from now as part of a frame off. I will be gathering parts , axles shafts, lift kits between now and then. I read through the whole thread and a couple of things caught my attention. I noticed that the heads, intake and exhaust are "tuned" at the ~3200 RPM of the 4.0 Power band. Is there a suggested setup that would better suit the 2200 RPM powerband of the 4.2. What about injector selection? I really like the low rpm torque of the 4.2. I also intend to do port matching and polishing.

87 YJ The Original!

Quote:
Originally Posted by Anticanman View Post
It goes in that barrel you wheel out to the street once a week.

My build thread http://www.jeepforum.com/forum/f12/n...thread-867043/
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post #201 of 620 Old 11-10-2011, 09:06 AM
unclewilson2
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Is the bulkhead connector the same for a 90 as the 88 & 89 wrangler? Also heres the bulkhead connector from a 93 4.0!
Attached Thumbnails
5 wires to fire   2,5.jpg   93 yj 4.0.jpg  
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post #202 of 620 Old 11-10-2011, 09:26 AM
unclewilson2
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If the 91 4.2 is the same as a 90 4.2! only a5 and a6 needs to be switched? if so how does hesco make so much on thier wiring harness? bought the 95 harness on ebay 30 dollars shipped!
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4.2l pinout on 91 tj.gif  
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post #203 of 620 Old 11-10-2011, 09:28 AM
unclewilson2
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I think i have info overload have to many pinouts! hahahaah
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post #204 of 620 Old 11-11-2011, 06:01 AM
Tshark299
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Quote:
Originally Posted by unclewilson2 View Post
If the 91 4.2 is the same as a 90 4.2! only a5 and a6 needs to be switched? if so how does hesco make so much on thier wiring harness? bought the 95 harness on ebay 30 dollars shipped!
'91 should be a 4.0L. I would think it would be more similar to a '93 or '95 harness.

'87 YJ Laredo - 4.0L, AX-15, NP231, 4.10s: 3.5" BDS, 31" Muds

'95 XJ - Donated drive train to the YJ, Parted out the rest

'51 CJ-3A - Buick 225 V6: Painless Wiring Harness, Warn Overdrive & Hubs, 2" Lift, 31" Muds
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post #205 of 620 Old 11-11-2011, 05:13 PM
unclewilson2
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went to beeman jeep dealer they didnt have a fsm for a 90 sahara ! guess im gonna have to buy one tks ....its hard to find the bulkhead connector for the 90.
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post #206 of 620 Old 11-11-2011, 06:14 PM
unclewilson2
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bought a 90 fsm and a 95 fsm !!!!
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post #207 of 620 Old 11-20-2011, 08:30 PM Thread Starter
cevans87
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sorry i haven't posted in a few weeks, been really really busy...

ok so i got the aw4 installed and it works great...

i went ahead over the few months that i had it on the work bench and put a new front seal, torque converter, pan gasket and filter in the thing...

also i "clocked" the transfercase so it would clear the skid plate and let me add that i did not use a clocking ring i just did it by sight...

the only thing that needed to be modifed was the skidplate for the new transmission mount which only took about 5 minutes with a drill...

my driveshaft sits at a better angle and all of the shaft is in the case instead of about only an inch...

i used the yj radiator ports for the tranny cooler which is how the radiator came anyways... regular radiator hose connections and then two inputs for tranny fluid.

things i had to have to make the swap happen...

tcu (transmission control unit)
aw4 transmission
np231j
transmission hoses
2.3 gallons of tranny fluid
a drill

now i also used the xj np231

the only difference between the xj and yj tcase is the 4x4 lever

if you use the on off the yj it works flawlessly.

alos everyone asks me about the shifters

i used the stock tcase shifter with a small modification which is just a bracket, and then used the xj transmission shifter, all under the same boot that covered the ax-15 and np231 from the factory... looks sweet

also everyone who has seen it say's well how do you know which gear your in, and for a jeeper who has been on both sides of the yj,xj scene... it's not hard for me to put it in drive and go, but then the thought of my wife driving it and hurting my baby because she doesn't know which gear she's in kind of scares me...

so with a little cross referencing i found that the nss on the aw4 sends a 12v signal to the ecm.... yay !!!

so i put indicator lights in the dash color oriented of course and used a common ground on all, then ran a group of wires through the firewire and hooked each up individually at the nsss connector on the right side of the motor... works flawlessly untill i destroyed my nss trying to put it back on after cleaning it early today... so a run to the junkyard hopefully tommrow will put her back on the road...

i have no complaints with the aw4, nothing was wrong with the ax-15 but the aw4 was given to me by a friend who had me do a fuel injection swap on his 89 sahara who got it when he bought the motor... he didn't want the tranny and was going to throw it away... a true jeeper see's promise in even the small things

i will say this for those who are on the fence... i have a lot more throttle responce, and torque output... maybe not the numbers to hold up my statement but i know i can burn the rubber off my tires now from a stand still when before i could only chirp

all in all it took about 2 days with the weather being as cold as it was... needed to come in every so often and get warmed up then spent two ciggarettes and 15 minutes trying to figure out where i was in the process again

i will get pictures of the swap posted soon... if anyone needs anything just let me know...

Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
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post #208 of 620 Old 11-20-2011, 08:37 PM Thread Starter
cevans87
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oh and for those who have posted and i have not responded, most of the time i am at work and my phone chooses to let me know when i have posts... here is my number if you have seen i haven't posted on someone's question please call me and tell me to get off my *** 4345820148

uncle wilson, i had 90 wrangler pinouts posted man i hope you didn't spend all that money waiting on me... the should be on the first two pages of this thread

Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
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post #209 of 620 Old 11-20-2011, 09:27 PM
brentd711
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I'm finishing a '93 2.5L swap into my '90 2.5L. Keeping the '90 gauges and sensors and have a question on the fuel pump and sender. I've got it wired right now to power the pump (from a '93) through the '93 harness (PDC) but that won't give me a gauge signal I can use, right? Do I have to run a separate wire back to the gauge?
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post #210 of 620 Old 11-21-2011, 05:45 AM Thread Starter
cevans87
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Your guage wire is there, does not need a new wire...

Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
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