Prevent Vim’s autocmd from running on write just once

I guess you’re looking for :noa.

Usage:

:noa w

Excerpt from help:

:noautocmd :noa

To disable autocommands for just one command use the “:noautocmd” command
modifier. This will set ‘eventignore’ to “all” for the duration of the
following command. Example:

:noautocmd w fname.gz

This will write the file without triggering the autocommands defined by
the
gzip plugin.