New 2zrfe swap.

[Basmii]

Originally Posted by CrankyOldMan

As someone who works in the automotive manufacturing industry, I highly discourage anyone from soldering connections on an automotive wire harness. The vibration stress will cause them to fail and become a nightmare to troubleshoot. Maybe not right away, but eventually. Crimping is the way the OEMs do it, you should too. =)

Looks like a beauty of an engine! Hopefully the internals are clean as well. If you've got some spare cash for the swap and want to be the first to try it, monkeywrenchracing.com has a long tube header for the 2ZR Corolla. No idea if it will clear the firewall and fit into the Yaris tunnel, but someone needs to find out. ;)

Do you recommend the regular heat shrink butt connectors or do I need to use something different?

[CrankyOldMan]

Originally Posted by Basmii

Do you recommend the regular heat shrink butt connectors or do I need to use something different?

Aah, I see that it's already been damaged/spliced. Ideally you would replace the whole wire to maintain the integrity of the insulation but that's not really practical in most cases. Heatshrink butt splices are fine here, just make sure you have a proper tool for both crimping and heating.