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Old 11-03-2012, 08:48 PM   #1
standtall99
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Swap Engine Wiring Problems.

Hello everyone, my name is mike, i have posted about this very same project before with similar questions,since then my knowledge has expanded a little,i own a 1996 ford bronco,i had bought it as a shell,it came with a 351w block in it that was ceased. I was going to take parts from this and put it on my other bronco at the time, a 1993 Eddie Bauer with a 302 5.0 in it. The shell i bought was in much better condition rust and interior wise then the 93.
So i decided economically of course, to put the 302 into the 1996 shell i had purchased,i did exactly that. With the help of many backyard bronco mechanics and my noob self i achieved my goal. I have both wiring harnesses from the 302 and 351.
Right now i have the 351 obd2 harness on the 302 engine,which does run,only it wont shift automatically and when i shift it manually from low gears 1 and 2and then to drive,which drives fine in all gears, eventually my voltage meter gage goes to nothing and the engine dies.

Questions-
Now i understand that i need to put a 302 OBD2 1996 Wiring harness on this truck to make it work properly,right?
That has been impossible to find^

Also why is my voltage meter draining,i need to drive this truck and i wouldnt mind manually shifting it from low to drive if i have to for a while, is there anyway i could leave the 1996 351 obd2 harness on and fix the voltage meter from draining so i can drive this truck?

Can i somehow mash the two harnesses together, the 302 ob1 which has all the plugs that fit the motor with the 351 obd2 which has the right brain for the tranny and truck etc and come out with a sucessfull product.

Is there any aftermarket harness that i can purchase to make this truck run properly that s not 700 bucks?

Can i take the harness and brain from a 1996 302 f 150.250 etc?

If you have a solution please contact me,if you have a 1996 302 obd2 wiring harness you would like to sell,please also contact me,i live on long island but am willing to travel,or pay for shipping which ever is cheaper.

Please respond with any questions you may have or solutions.
Im sorry if any of my technical lingo is not correct or if anything stated above is in fact un factual,please correct me.
Thank you all, Mike.
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Old 11-03-2012, 09:12 PM   #2
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Your 351 wiring harness should work, only if you install the correct sensors to match the plug outputs. Being that the 96 is MAF, I believe that it should work just fine. The trouble is, you have an OBD1 motor installed in the OBD2 system. Get the correct sensors to install (ECT, TPS) and use your existing harness. It sounds like your TPS is unplugged which would cause your shifting issues.

Check out this thread of mine where the owner was having the same issue with the trans in a 96
http://www.fullsizebronco.com/forum/...d.php?t=143387
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Old 11-03-2012, 11:03 PM   #3
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I belive the only differance between the 5.0 and 5.8 harrness is that the 5.0 has a knock sensor. This would also not be in the 5.8 computer. Idk if you need it if using the 5.8 computer but it is something to think about. Also did you add all of the o2 sensors related to obd2, i think theres three. If you used your old y pipe for the swap it will only have one.
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Old 11-04-2012, 08:28 AM   #4
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yeah all the o2 sensors are there, what is a list of sensors i have to replace inorder for them to fit my 351 ob2 harness,i need more then just the acriviation cause im an idiot,a picture would be more than thankful,please,thanks for your help guys,mike.
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Old 11-04-2012, 09:53 AM   #5
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Hey,i called auto zone and they have both the parts, the tps sensor and the ect sensor,i need them for a 1996 obd2 302 right? Thank you guys.
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Old 11-04-2012, 09:58 AM   #6
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when i put my 97 351 (still obd1, came from a heavier truck) in my 92, i used the 97 alternator, but i remember something was different in the harness there (i used the 97 harness) that my 92 harness. since you have both harnesses, shouldnt be hard to check. you may need to use the other alternator, i dont know, but just some simple and cheap (since you alresdy have the stuff)things to try. sorry about the other issues, i have a 5 speed, i cant help you there.
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Old 11-04-2012, 10:10 AM   #7
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Heres pics of all the sensors and or wires that either dont have a plug that fits or i dont know where it goes, if you could identify any please let me know,and also what to do,get a newer one,etc thanks!






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Old 11-04-2012, 11:10 AM   #8
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Heres pics of all the sensors and or wires that either dont have a plug that fits or i dont know where it goes, if you could identify any please let me know,and also what to do,get a newer one,etc thanks!

You'll need to get the EGR for the DPFE sensor. Which means the EGR tube and the ERG valve has to be changed. That plug your holding looks to be the DPFE sensor plug

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Originally Posted by standtall99 View Post
No idea :/

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Originally Posted by standtall99 View Post
This looks to be the ECT plug but I could be wrong

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Originally Posted by standtall99 View Post
This plug shouldn't even be on the 96. It's the OBD1 test port

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Originally Posted by standtall99 View Post
Not sure what your showing here

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Originally Posted by standtall99 View Post
Did this valve come off the 96 351, or the 93 302?
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Old 11-04-2012, 01:00 PM   #9
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Ok, so so far i have to get
A TPS Sensor
A ECT Sensor
The EGR for the DPFE sensor, the EGR tube and the ERG valve,for a 96 ob2 302,correct?
The 5th picture im just wondering where that hose goes too.

also that valve is from the 302 93
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Old 11-06-2012, 01:55 PM   #10
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anyone?
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Old 11-06-2012, 05:26 PM   #11
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Ok, so so far i have to get
A TPS Sensor
A ECT Sensor
The EGR for the DPFE sensor, the EGR tube and the ERG valve,for a 96 ob2 302,correct?
That's a start


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The 5th picture im just wondering where that hose goes too.

also that valve is from the 302 93
That hose comes off the smog pump. It goes nowhere. I know in the 96 351's, they did away with the smog pumps. They just have a pulley in its place.
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Old 11-09-2012, 12:18 PM   #12
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so should i take that hose off?
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Old 11-09-2012, 12:56 PM   #13
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Did you swap the entire OBDII harness, engine and injector? If not, you're going to have problems. The OBDII EEC and harness from the '96 should be plummed for a MAF. I'm guess that your 302 was not a MAF motor and therefore would not have the MAF injector harness, so that won't work.
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Old 11-09-2012, 03:42 PM   #14
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I never had the obd2 injector harness,so no i guess its not on there,i dont know what MAF means at all can you explain further?
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Old 11-09-2012, 03:45 PM   #15
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so your saying i need to get an obd 2 injector harness, well i think thats just impossible
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Old 11-09-2012, 04:47 PM   #16
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so should i take that hose off?
I wouldn't worry about it.

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Did you swap the entire OBDII harness, engine and injector? If not, you're going to have problems. The OBDII EEC and harness from the '96 should be plummed for a MAF. I'm guess that your 302 was not a MAF motor and therefore would not have the MAF injector harness, so that won't work.
He swapped the engine from an OBD1 truck into the OBD2 truck.....at least that's my understanding. But, he does show a pic of the OBD1 port, so that makes me a little confused But he does state that it is running


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I never had the obd2 injector harness,so no i guess its not on there,i dont know what MAF means at all can you explain further?
Because the engine was gone, right? I'm not totally for sure whether the injector harness will make any difference, or that the OBD1 harness will plug into the OBD2 harness.

MAF is short for mass air flow. And if your running the harness from the 96 (OBD2), then you'll need the mass air flow connected.
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Old 11-11-2012, 10:32 AM   #17
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yes my guy connected MAF he used all the o2 sensors and the original 96 air everything, the injector harness is from the 93 and the engine harness is from the 96, but it runs ok even with that,all gears just not automatically.
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Old 11-11-2012, 04:03 PM   #18
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Okay so i put the new ECT vavle in and found the plug that did fit it, but while doing this i have found more plugs that dont go anywhere among other things,if you could decipher any please let me know its much appreciated.
my next step is to get a new 96 egr valve.








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Old 11-13-2012, 11:14 PM   #19
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anyone?please?il pay you if you have paypal
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Old 11-14-2012, 01:25 AM   #20
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Time to start tracing wires to the EEC. Otherwise, we could just guess...

You should have an 16-pin OBD-II J1962 test connector inside of the cabin interior within 2 feet of the steering wheel. If your pic is truly an engine compartment mounted OBD-I Test Connector, I am thinking that you may actually have a 1995 or earlier Bronco. What is your VIN #? How many pins on your EEC? 60 or 104?

See this link: OBD-II E4OD Mass Air Pinouts
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