Cold start fails for me at times

[imacken]

Often in a cold start, the revs start going up, I move the throttle to idle around 10%, the revs continue to go up to around 20-30%, but then start going down again to 0% and the start fails.

I know it's something I'm doing wrong.  Any ideas on what causes this to happen?

[Galinette]

It could be the igniter plug selector. This one is just between fuel cutoff and starter press button.

This switch has three positions : Vent (disabled), G(left) and D(right). For startup, you need an igniter plug so you need to be either on G or D.
On Vent things will go as you describe, no flame, so starter will stabilize RPM at about 30% and after a timeout it will stop.

The igniter switch is randomly set on G or D at cold start. That's because they should be worn evenly, so pilots switch between G and D at each startup. They don't set it to "Vent" at shutdown. Normal procedure would be changing position between G and D every time, but you can let it as is.

Now what may happen, is you are used to do a left click every time. If the switch was on D it goes to G and that's fine. If it's on G you set it on VENT.

 

 

[imacken]

Thank you! I'm sure that's exactly what it is!  I think I was switching it from the central position to the left thinking that was G.

[Galinette]

Perfect!

We made the random G/D change some times ago upon request from an IRL M2000 mechanic that had OCD seeing the switch at the same position every time