4.2L Fuel Injection and Build - Page 13 - JeepForum.com
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post #181 of 612 Old 10-07-2011, 10:08 AM
remmons
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Quote:
Originally Posted by 94chb View Post
thanks for the info , but i came across an easier cheapier route, i grabbed a 91 wrangler 4.0 fuel injected, 5 speed. for..................$500 and ive got the tub and frame sold for $300 so im only gonna have $200 into the whole swap from carb to fuel injection and from auto to 5 speed

and everything should just bolt up since everything is coming from a wrangler, heres a pic of what i got. everything is there but the rear end.

Sweet deal and a good find! This will definately make things a lot easier. Keep us posted on your progress.


Robert.

2015 Cherokee Trailhawk V6.
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post #182 of 612 Old 10-20-2011, 01:14 PM
unclewilson2
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looking for bulkhead pinout for 90yj 4.2l ..............and 95 yj 4.o.. not much info for wrangler to wrangler engine swap........im down to just the wiring on the bulkhead! tks
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post #183 of 612 Old 10-20-2011, 01:57 PM
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I will have to dig and filter through my stuff to locate my paperwork, but I think that I can come up with something. I have a folder somewhere at home that has nothing but Jeep conversion stuff for when I did my project. Of course I used a harness from a '93 XJ too, so if you're doing one from a Wrangler, it will be different.

Robert.

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post #184 of 612 Old 10-20-2011, 02:11 PM Thread Starter
cevans87
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remmons appreciate the help but your highjacking my build thread lol...

unclewilson2 pm sent with the diagrams you requested

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 #185 of 612 Old 10-20-2011, 02:19 PM Thread Starter
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will be updating soon...

have a lot going on right now with the marine corps, and as a matter of fact getting ready to head out the door to the marine corps birthday ball...

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 #186 of 612 Old 10-20-2011, 02:46 PM
remmons
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Originally Posted by cevans87 View Post
remmons appreciate the help but your highjacking my build thread lol...

unclewilson2 pm sent with the diagrams you requested
Sorry, didn't realize that I was hijacking your build thread. It was only meant to throw in my input on what I had to offer. Looks like unclewilson2 came to the rescue.

Robert.

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post #187 of 612 Old 10-21-2011, 03:45 AM
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daughter , son in law , both are marines son in law is D.I in san diego im also n x marine! Gonna try to print that manual today are the bulkhead connectors for yj 4.0s all the same ? are the bulkhead connectors all the same for the 4.2l? if so i dont have to be year specific ! also tks ive done alot of reading this thread and many others!not many conversions done wrangler to wrangler! none detaileds for sure that! tks .............went with the 4.o all 4.o sensors ,alt,starte,r coil ,dist, and an electric fan from ? went with the single fuel rail.........2001 fuel tank with internal regulator ...dist but in on compression stroke on #1 marked on dist. 5 o clock position .......down to moving wires on bulkhead connector ..........computer iis for a 4.o manual trans ,,,,,,,,,..........do i have to fool the comp into thinking its in neutral? i know u have to in a automatic ,fool it to thinking its in park.........id like to say this thread has been helpful ......but its a litle bigger than a thread its a whole sweater!!!!!!!!!!!!hhhahahahaahah again tks
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post #188 of 612 Old 10-23-2011, 01:05 PM Thread Starter
cevans87
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unclewilson give me a call 434-582-0148

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 #189 of 612 Old 10-24-2011, 05:35 PM Thread Starter
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Ok, been a while since I updated... So here goes

I was driving home from work a few weeks ago when I started to notice the exhaust note had gotten much louder...

After getting home I lift the hood to find that the last stud on the exhaust manifolt stripped completely out of my Hesco Aluminum Head.

I called Hesco and very nicely asked why Helicoils were not put in prior to leaving the plant... Only to recieve no responce. They did however drill and tap everyhole and insert helicoils for free...

Two weeks later I get the head back, and had decided before hand while I had the head off, to go ahead and do new valve seals as well...

Put the new seals on and on went the head...

After getting the head back on and everything back together I started to notice water dripping from the rear of the block, after looking around and not seeing anything stick out to me, I got pissed and went and bought a pack of smokes, I'm trying to quit . I was just that pissed.

Took the head back off, replaced it and back on went the head. Only to still have the same leak as before...

So I took a few minutes to think and started looking at the motor very hard... Then I spotted it !!!

Water leaking from the number 4 exhaust manifold bolt !!!!!!!!

I called Hesco the next day and they informed me to teflon the bolt and that water being behind that bolt is normal for there heads....

So once that was fixed i started to give the old girl the beans... Then I noticed that it wasn't running like my strong old 4.7 before... but now like a whimmpy 2.2 mazda engine that had just got beat up on the playground.

So i started to ponder "what is goin on"?

Then i decided that either a. the valves were out of adjustment or b. that i needed to lap the valves because i took the valves out...

So never lapping valves before I did what any 24 yr old guy would do ... looked on youtube...

I found a very nice detailed 3 minutes video on how to lap valves... then I went to the parts store got a lapping tool and some compound and I was at it for the next 6 hours....

Only because I had one valve that took 6 hours to do because it was pretty bad...

So after doing all that then putting the head back on I am glad to say she is running again...

Now for those of you who don't know, and need to know, or just want to know...

Lapping a valve is done to create a new seal on the valve face...

It's very easy to do and the tool and compound together only cost $10...

You start by removing the valve keepers and springs, and doing only one cylinder at a time, so you don't mix and valves up...

Then you put a small amount of compound on the valve face, apply your new handy dandy suction cup tool put the valve in the head and start spinning it in your hands like your trying to start a fire, pulling out every few seconds and popping the valve back down 2-3 times to bring in more compound, also turning a quarter turn every time you pop as to get a good seal on the entire valve surface... Once very smooth, and all pitting has disappeared you can move to the next valve.

Also for anyone who had mistakenly messed with the little set screw on the throttle body... here is how to adjsut it to factory specs...

Unscrew it all the way, screw it back in untill it touches the throttle plate, and then turn a half turn more. Pull back on the throttle and relase so that it snaps back to the set screw... if the throttle opens freely and doesn't stick you have a properly adjusted throttle body...

Enjoy the pics, will aslo be posting a video of valve lapping a 4.7L Jeep Stroker on youtube and will provide the link.
Attached Thumbnails
2011-10-11 19.40.02.jpg   2011-10-11 21.25.05.jpg   2011-10-11 21.27.01.jpg   2011-10-21 15.23.49.jpg   2011-10-21 15.24.07.jpg  


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 #190 of 612 Old 10-24-2011, 05:36 PM Thread Starter
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compound on valve
Attached Thumbnails
2011-10-21 17.42.47.jpg  

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 #191 of 612 Old 10-24-2011, 07:01 PM Thread Starter
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Lapping Valves

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 #192 of 612 Old 10-31-2011, 05:09 AM
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Quote:
Originally Posted by cevans87 View Post
unclewilson give me a call 434-582-0148
well going thru and double checking my connections all lights hazards wipers working . but no power coming out of bulkhead when key is turned ! can activate starter with relay ! thanks for the offer to call! when i get down to where i give up ill call tks .........
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post #193 of 612 Old 10-31-2011, 07:36 AM
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Cevans87, I just read through your whole thread and man is there a ton of great info in here. Thanks for all that effort. I have a question though. At the beginning of this thread you talk about intake and exhaust runners for the 4.0 and how they are tuned to ~3500 rpm. Since the standard 4.2 power band is at ~2200 how does the change effect the power band on the original 4.2? My automatic with 33's needs either 3.53 or 3.73 gears. Would I have to change my gearing with this swap?

87 YJ The Original!

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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 #194 of 612 Old 10-31-2011, 08:14 PM Thread Starter
cevans87
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wanabejeeper ... no it will not effect, you will actually see a huge power increse by fuel injecting... but if your running the 999 automatic, that tranny does not have an overdrive which is killing your mpg's... either way fuel injection will help with the power, and fuel consumption

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 #195 of 612 Old 10-31-2011, 08:16 PM Thread Starter
cevans87
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unclewilson, it sounds to me like you have the "ignition run wire and ignition start wires" not connected properly... trace your connections and if you can't figure it out, a shor call to me and we will have you on the path to success

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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