which 1990s toyota inline 6 had firing order NOT 1-5-3-6-2-4?

[indigoid]

An engineer at Ford in Melbourne mentioned on another forum that they'd noticed this and built up test Ford i6 engines with both orders (presumably requiring a custom crankshaft) to figure out why Toyota did it

Have done a fair amount of googling; every i6 I can think of, from every mfg (including Toyota G/M/JZ/FZ) seems to be 153624 order

I also saw one page that seemed to claim an unusual firing order for Ford Barra i6 but it seems to be an abomination and I suspect the page was wrong. They would have needed a very good reason to change it after decades of happily being like everyone else

[bk_]

I know that 80s/90s 6 cylinder Toyota engines (except 2jz) use semi-sequential injection (injectors wired in pairs), but firing order?

[George]

vvti JZ engines use waste spark system, in which 1-6, 2-5 and 4-3 cylinders are combined. So I assume they're 153624, and so are their predecessors, those with distributor. Since the JZ originates from M series, I bet 5M, 7M etc etc are 153624 too