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4.0 swap complications(codes after install)

adsm08

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I would say that your 150 ohms is a problem. The wiring for the sensors does just run right to the computer, so I would just overlay it.

Start by finding all the connections in-line with the circuit. I know there is at least one where the injector harness plugs into the engine harness. Then test each leg individually to find the problem. It might just be a bad connection.

I had no fuel pumps and an open on the leg between the relay and the inertial switch. I started unplugging things to test the individual legs, no problem found, put it all back together and it worked. That was the same situation as yours, I knew the vehicle the wiring cam from ran.
 


chrwilkins30

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I checked at the o2's, the plugs by the alternator and the computer. ( both sides of all connections) and I'm getting about the same thing at every part. I opened the computer and found a burnt circuit. It would actually start smoking for a quick second. Then it would clear.Couldn't track on the board to see which circuit it went to but I went to the JYs and looked for a computer but of course I couldn't find one for a 94 which is basically a isolated year for the computer.
 

adsm08

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Are you running an auto or manual trans?

I have a 94 manual trans computer. I'm kinda using it right this minute, but I have a 93 that I could swap in and have it running again in under 2 hours, so I'd give up the 94 if you can use it.
 

chrwilkins30

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already ordered one from rockauto, need it ASAP!

im running a manual with a auto computer.

Thanks for the offer though.

really hoping this is the problem. if not I don't know what i'm going to do.
 

chrwilkins30

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Well it wasn't the computer. All that did was fixed the one burned circuit and didn't fix a god damn thing.!!!:annoyed:
 
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chrwilkins30

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Okay. got ahold of a scanner and got some different info.

KOEO- auto trans codes (not an issue)
KOER- 136 AND 172

Here's the weird part. If i'm getting 172 for a lean condition why is the o2 sensor reading .94. That should be reading a rich code.

also the truck is not allowing me to see any live data what so ever which is the whole reason for the scanner. Now is it that the explorer doesn't give that kind of info or is it the scanner or some more wiring issues???
 

SenorNoob

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Did you check the polarity of your connections? This sounds very much like the problem I had. Voltage was 0.8 ,but; had a lean code. Turned out the positive and ground wires were crossed. The ECU saw -0.8 volts. That being lower than 0.45 or whatever, ECU assumed lean and added more fuel.
 

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