3.4 Swaps The 3.4 V6 Toyota engine

o2 sensor wiring... can't find them...

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Old Jun 11, 2010 | 01:51 PM
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o2 sensor wiring... can't find them...

okay i'm missing something from somewhere on my swap. i thought the o2 wires would be apart of the speed speedo loom.


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Old Jun 11, 2010 | 01:52 PM
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i also thought the two blue connectors was the o2 connectors but that's not correct.
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Old Jun 14, 2010 | 08:24 AM
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On my swap the plugs were called h3 and h4 on the control unit EWD's. four wire plugs, of course the scrap yard cut that part of the harness off mine.
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Old Jun 14, 2010 | 08:54 AM
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yeah i found them this morning. they got cut off. i'm wondering where i can get the plugs from. Which other cars use the same 4 wire plug.... This could be the easiest solution, because finding 3.4 trucks at the local pick your parts are next to impossible.

The rear i will just run the o2 emulator/bypass.
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Old Jun 14, 2010 | 01:18 PM
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I ended up soldering in my rear one.
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Old Jun 15, 2010 | 08:31 PM
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Can be ordered seperately

You can get them at the dealership. They carry the most popular ones (like the o2) in stock usually. Take a look at this link, you will prob be looking for female waterproof if memory serves.

http://www.ih8mud.com/tech/WireHarnessRepairParts.php
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Old Jun 16, 2010 | 12:14 AM
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most o2 connections are the same.. steal them from your 3.0 harness. I also used my transmission harness section from the 3.0 since my transmission is the same one and just soldered it in.
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Old Jun 16, 2010 | 11:27 AM
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that connector page is pretty darn good to have. but i think i'll head out to the junk yard and grab the plugs with a little wire attached.

thanks guys...
OMG work is so boring today I would love to have a nice cold quality beer.
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Old Jun 16, 2010 | 11:47 AM
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the 3.0 o2 sensor plugs are not the same, I tried that too.
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Old Jun 16, 2010 | 12:20 PM
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probably need to knock out some kind of plastic tab out of the 3.0 harness connector. IDK
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Old Jun 22, 2010 | 02:25 PM
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Note that I went to the junk yard and nabbed two o2 sensor connectors, and the fit perfectly. So they should be the same. As long as it's a four wire o2.
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