4.2L Fuel Injection and Build - Page 32 - JeepForum.com

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post #466 of 620 Old 08-05-2012, 06:27 PM
getbent01
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1979 CJ7 
 
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got some ? about the wireing. I am doing this swap on my 79 CJ and am not sure what all needs to be hooked up or where it needs to be hooked up to. All of the mpi parts came from a 93 XJ. Any wire prints or pics would be great. Thanks.

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post #467 of 620 Old 08-06-2012, 01:28 PM
Que89YJ
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1989 YJ Wrangler 
 
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Use these 2 threads to search the forum GB. Try posting up to a new thread if you have any questions:
http://www.jeepforum.com/forum/f12/f...oogle-1003734/
http://www.jeepforum.com/forum/f12/a...-forum-992517/

For pics just select the images selection at the top of the google page.
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post #468 of 620 Old 12-30-2012, 10:20 PM Thread Starter
cevans87
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1992 XJ Cherokee 
 
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Just wanted to check in a see how everyone was doing. Remember, I'm always here if anyone needs any help.

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 #469 of 620 Old 12-30-2012, 11:16 PM
94chb
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Quote:
Originally Posted by cevans87 View Post
Just wanted to check in a see how everyone was doing. Remember, I'm always here if anyone needs any help.
i havent had any issues with my Swap, i beat on it every weekend and still holding up great.

here is a recent video, not best quality but you get the point.

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post #470 of 620 Old 12-31-2012, 07:44 AM
Zorm
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still wating to get my 4.7 stroker back from the machine shop so I can put it all back together. I know I will come back to this thred a few times for reference. I was happy to find the wire diagrams you shot me in the first few posts of this for my SJ. I think the wiring will be the real work part of my build. Still need to get ford 24lb injectors and the larger throttle body since I will be sucking in more air with this engine. Got a few folks seeing how a stroker will work in a SJ.
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post #471 of 620 Old 01-02-2013, 11:58 AM
aggiejon
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Got mine all back together. Cannot explain the feeling of pure accomplishment that I felt when I turned the key on this thing and it turned over the very first time. WOW! Now I just need to finish a few loose ends, such as completing the alternator hookup and the exhaust.

A huge thumbs up to CEVANS87 on all his help to make this work!
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post #472 of 620 Old 01-08-2013, 08:02 AM
lakeobum
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1989 YJ Wrangler 
 
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Location: clinton
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I recently finished this swap, thanks to the OP and all of the input from everyone else.
Two questions:
1. it is very cold natured at first start in the morning and after it sits a while, barely idles at 4-500 rpms. Did I miss something?
2. I still cant get rid of the CEL, i tried a resistor between the alternator field wire and battery +. I still have a code 41.
It is a 89 YJ 4.2 with 92 4.0 head and FI.
Any thought?
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post #473 of 620 Old 01-08-2013, 08:18 AM Thread Starter
cevans87
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Ecm could be bad along with or tps or iac, just off the top of my head... I have had bad ecms do the same thing with idle and bogus code scans

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 #474 of 620 Old 01-08-2013, 05:28 PM
lakeobum
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Quote:
Originally Posted by cevans87 View Post
Ecm could be bad along with or tps or iac, just off the top of my head... I have had bad ecms do the same thing with idle and bogus code scans
I actually have a spare ecm, I'll give it a try. The iac and tps both came on the junkyard inatke, might try to find a test orocedure for them too. Otherwise, it runs sooooo much better than the weber i had on it.
Used weber anyone??
Thanks,
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post #475 of 620 Old 01-08-2013, 09:08 PM
Que89YJ
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Idle when decel is a missing vss. The alt. Why don't you swap and use the external setup from a late model? Cold start I would look at the cts and fuel pressure to see if pressure is bleeding down.

Fault codes:
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post #476 of 620 Old 01-09-2013, 10:04 PM
Collin89Sahara
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Specing out a list for a potential stroked 4.0l or injected rebuilt 4.2/ax-15 swap. This thread will be useful Is everything needed to complete a swap in your thread OP? I haven't the time to read every page.
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post #477 of 620 Old 01-10-2013, 05:24 AM Thread Starter
cevans87
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Yes, everything is listed

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 #478 of 620 Old 01-10-2013, 09:02 AM
Collin89Sahara
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Quote:
Originally Posted by cevans87
Yes, everything is listed
If I were to swap in a 4.0/ax-15, couldn't I just find a computer from 91+ wrangler?
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post #479 of 620 Old 01-10-2013, 09:55 AM Thread Starter
cevans87
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You could but the wiring harness is different I believe

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 #480 of 620 Old 01-20-2013, 10:53 PM
Thump
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Quote:
Originally Posted by cevans87 View Post
Just wanted to check in a see how everyone was doing. Remember, I'm always here if anyone needs any help.
I have been reading this post for some time now and the information is overwelming and much appreciated. I have aquired a 1988 Jeep YJ, 4.2, 5 speed with 3.07 axle ratio. Has 162000 km and in pretty good shape other than some surface rust. I have changed the fluids throughout the drivetrain before doing anything else to see if the vehicle was worth rebuilding and everything is good.So far I have installed a 4 inch lift and new wheels with 33X12.5X15 YokohamaMTs,and replaced 2 worn U-joints. I am looking to do a head swap and add fuel injection . My question is, I have located a 1993 Cheeroke with 4.0, 5 speed, 200000km, that was wrote off in a rollover. What engine components from the cheeroke including wiring harness ,head,intake and exhaust manifold, distributor, will swap over to my YJ without to much trouble? Any breif step by step instructions as where to start will be very much appreciated? Also,what would be the lowest gear ratio I could go with and still keep the original axle cages? Thank-you
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