I've done a thorough search and it seems no one else has had this problem
Whenever i start my car *paricularly in the morning* it lets out a long sneezing sound as soon as it kicks over. (sounds like a delayed BOV sound) it happens after i leave my car parked for a while, but in the mornings it is particularly loud.
There are no driving problems and it just happens on start up.
The engine is a 4AGZE AE92 bigport, dual coil.
I've been told it is the starter solenoid ring, and the shaft is not pulling back and letting air through or something like that, but i have changed the starter motor about a year ago.