secondary injectors ("st" or "ms")?
 

I’ve been having an idle problem and I’m just trying figure it out.
I’ve zeroed the TPS and set the idle to 750 rpm but when looking at the laptop software
The bottom right corner shows that it is at idle but the injectors are at 8.33ST. I’ve read that “ST” means that the secondary injectors are firing and “MS” is just the primary. So my question is what could cause this?

-Bill

As I learn MT I'm finding these idiosycracys as well. The manual just isn't very good. This was one of my questions. The answer is that they will read sT when firing only the primary injectors. When the secondarys come on line the display should change to mS. Seems exactly opposite of what the manual says.

ok, thanks

Ok, so for applications that don’t need staged injectors: it will read “ms” until the secondary’s come on then it will read “st”

But on staged setup (rotory engines) it will read “st” until the secondary’s come on then it will read “ms”

If it's not setup to stage then there are no sceondarys.

Is what MT told me.

if I rev mine to say 4000rpm's in netural, it still reads "sT"
it never changes.

so is there a place to set it to "staged"?

BTW ....I now have a good idle at 750rpm's and the injectors output is at 3.00sT

The secondarys are engaged when you cross the programmed rev threshold AND the programmed MAP threshold. Free revving the engine won't produce a low enough vacuum signal, or boost, to engage the secondarys.

Your idle is fine because when you sT only the primarys are firing.

oh ya, I forgot about the MAP setting.

i believe the staging set command line was REVstg which is normally 3000RPMs iirc.