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Unread 08-17-2011, 07:48 PM   #76
YJames90
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Awesome! thanks

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Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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Unread 08-18-2011, 06:34 PM   #77
YJames90
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Figured out the Jeep bulk head plug wires and still cant find the pinouts for the S10. And why do I need another fuse box?
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Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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Unread 08-19-2011, 07:00 AM   #78
1 ton yj
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You need a fuse block for the engine harness. Just look up a tbi engine harness diagram, trim out what you don't need and power what you do need its that easy. My 6.0 uses 4 fuses for the whole engine harness so you shouldn't need more. If you're having trouble finding the engine diagram let me know I may be able to get it.
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Unread 08-19-2011, 07:14 AM   #79
JeeperDon
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Quote:
Originally Posted by YJames90 View Post
Figured out the Jeep bulk head plug wires and still cant find the pinouts for the S10. And why do I need another fuse box?
I eliminated the Jeep under hood fuse box, only use the GM box. Once all the motor stuff was factored out (which the GM box covers), the Jeep box only had a few main power lines and a horn relay. I used the horn relay setup in the GM box. My GM box also had some large fuses I would never use, power seats, rear defogger, etc. I hooked up the main Jeep power lines (20/30/40 amp lines) to those large item locations in the GM box. I figured out all the wiring with the AllDataDIY info.
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Member and Web guy: New Mexico 4 Wheelers My Truck Page on NM4W Site
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Unread 08-19-2011, 08:56 AM   #80
YJames90
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I think I understand but since the Jeep has its own fuses that powered the motor why cant I use it to power the 4.3?
They are both TBI
I was hoping to just match the jeep wires to the chevy wires and fire it up
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Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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Unread 08-19-2011, 09:17 AM   #81
leftlanetruckin
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I did the opposite and used the Jeep fuse box, then supplied a few power feeds to the Chevy ECM from it.
Seemed easier in my book to do it that way on the TBI swaps.

Martin
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1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
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2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/f12/swap-offically-underway-324622/

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Unread 08-19-2011, 10:32 AM   #82
YJames90
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Quote:
Originally Posted by leftlanetruckin View Post
I did the opposite and used the Jeep fuse box, then supplied a few power feeds to the Chevy ECM from it.
Seemed easier in my book to do it that way on the TBI swaps.

Martin
Thats what I was thinking. The power feed are all there in the harness if I am correct. I have the complete wireing harness installed up to the bulkhead. Do I need to supply more power? Maybe I have to go back and read some more
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Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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Unread 08-19-2011, 10:50 AM   #83
leftlanetruckin
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All this will be coming back to me soon enough, as I have another one to do shortly.
The power to the ecm is the main thing to grab out of the fuse box. I found it easier to do that than rewire all the lights, turn signals, heater controls, etc etc etc. I wired up the fuel pump relay as per the Painless instructions. That and the ecm power is about all you need for a tbi swap IIRC.
Next project for me will be a 4.7 rebuild in a WJ we are about to pick up for our 15yr old, then onto Dave's rig with the 4.3/700R4.
IIRC though, the bulkhead plug splits into two, one for mostly engine stuff, the other for lights etc. The vast majority of the engine stuff can go, with the starter wiring staying put to connect to the chevy starter. You can also try to use the temp gauge wiring and so on but it never worked right for me until I fitted the Autometer gauges and associated sender units.

Martin
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1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover 4.6 HSE
2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/showthread.php?t=324622

Years to gain the hands on experience, and offer it freely.
Minutes to gain the knowledge from the internet, and quote it just as freely.
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Unread 08-19-2011, 11:10 AM   #84
YJames90
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Looking at the pinout chart for the YJ. Why cant I splice in the YJ wires to the S10 wires for the following?
fuel pump
battery
ignition switch
starter
coolant temp sensor
tach
oil pressure sender
starter relay crank.
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Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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Unread 08-19-2011, 04:47 PM   #85
AaronJ
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Did those ecm pinouts match your ecm? That's what you are looking for from what I can tell. From there you can take your harness apart and reassemble it with exactly what you say you want.

On my 5.7 I had the entire harness but when someone was removing it, they cut all the wires that go to the ecm right where they pass through the firewall. I was kinda bummed out about having to go through all of them and do the solder/heatshrink tubing thing but it actually turned out for the better because it forced me to go wire-by-wire from the ecm and gather up just what I needed from the harness to make the engine run rather than try to pick through the whole harness at once.

When I got done I had all the sensors connected, (1) wire that was supposed to be connected to battery positive continuously, (1) wire that needed battery positive from the ignition switch, (1) ground, (1) wire to feed the fuel pump relay, and (1) wire that sends a signal back from the fuel pump relay to the ecm. I started my engine on the first try (second actually, timing was a bit off on the first crank )

I still haven't spliced everything into the Jeep harness but I did remove all the old engine stuff from the Jeep and it's a piece of cake at this point. Work just keeps getting in the way of playing with the Jeep.
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Unread 08-19-2011, 05:58 PM   #86
JeeperDon
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Quote:
Originally Posted by YJames90 View Post
I think I understand but since the Jeep has its own fuses that powered the motor why cant I use it to power the 4.3?
You can do whatever you want. I went the GM under hood way because the OBDII system is more complicated than your simple '88 or my '93, and I thought it easier to integrate the simple one into the complicated one rather than the other way around. I basically had to move 4 large power cables into the GM box, and pick a socket in the GM box to handle the horn relay. After that I spliced dozen other wires to get the key functions working and the OBDII port set up.

Does your donor have VATS? I don't know the years for that, but you will have to have the ECM re-programmed if it does. Bolting it in is the easy part. Getting it running, and running right, is the tough part.

[to LeftLane... Hey Martin, good to hear from you again. James is a friend in my old club in NY, which I could be there to help him.]
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Unread 08-19-2011, 06:08 PM   #87
YJames90
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Going with this




and this


But the one for my 90.
So far I have 5 wires connected but not the five to fire. Finishing tomorrow and fireing it up
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Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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Unread 08-19-2011, 08:38 PM   #88
leftlanetruckin
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That could well be the major difference, mine was TBI so no OBDII in my case

Hey Don, pleasure to hear from you again mate!
When the hell did you move to Alb mate? I will have to remember that next time I go through there on 40 for some

Martin
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1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover 4.6 HSE
2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/showthread.php?t=324622

Years to gain the hands on experience, and offer it freely.
Minutes to gain the knowledge from the internet, and quote it just as freely.
Choose wisely!
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Unread 08-20-2011, 06:58 PM   #89
YJames90
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Todays update:
Pulled the Jeep out of the garage with the Titan on a strap . I then took the 4.0 with the trans to the scrap yard and got a whopping 89 bucks. Its all good cause its going back into the swap fund.
Daily life called and had to cut the grass and drive the kids places.
I tried to work on the wires but got lost and called it a day. It was hot today
Im going to wait until I get a full S10 diagram before I start again
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Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
YJames90 is offline   Reply With Quote Quick reply to this message
Unread 08-20-2011, 11:35 PM   #90
leftlanetruckin
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They make those umbrella's big enough to cover this?
Would make it easier to work on it outside...
polished-web.jpg

Martin
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1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover 4.6 HSE
2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/showthread.php?t=324622

Years to gain the hands on experience, and offer it freely.
Minutes to gain the knowledge from the internet, and quote it just as freely.
Choose wisely!
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