Half Blocked 1KRFE engine

[zoidberg444]

If by "blocked" you mean he can't turn it past a certain point of rotation and its not in gear it sounds to me like its slipped timing and smacked the valves or something. It should be fairly do-able to turn an engine over with a ratchet on the crank bolt - especially with the spark plugs out. Lack of power sounds like it has no compression on a cylinder. It would be consistent with slipped timing and having smacked the valves.

My advice mate - these 1KR engines are pretty cheap - certainly in the UK. They are the same engine in the Toyota Aygo, Citroen C1 and Peugeot 107. Get an engine from the scrapyard and have it put in. I'm not 100% if it applies to all of them but my Japanese made 2006 1KR Yaris has a different sump on it to the 1KR's on the Aygo-C1-107 so that might need swapping over from your dead engine to the replacement or it might not. Not sure.

Given its a 2010 it's probably just about worth doing. Have the clutch done while you're at it. You can probably get another 5 years driving out of it before it needs any serious repairs.