Rockets won't light in high altitdue

[backwardsx]

I am trying to build a two stage rocket but for some reason the second stage won't light up if the rocket gets too high before I initiate it. Is there something I could be missing? Nothing I have read so far seem to suggest that you need to light all rocket in the atmosphere before they will work.

[Capt'n Skunky]

Are you throttled up? (SHIFT key) Is it a rocket engine and have a fuel supply?

A screenshot would go a long way in helping diagnose this. Use F1 to take a Screenshot. Upload from {KSP install folder}\Screenshots to a site like imgur.com. Then edit your first post to include a link to the screenshot.

Cheers!

Capt'n Skunky

KSP Community Manager

[Rusk]

Thats why you have oxidizer afaik. In case you are using custom parts check if your tanks come with oxidizer. Also maybe between between your engine and the fuselage you have a part thats is not able to crossfeed fuel. Things like decouplers and such.

[ZingidyZongxxx]

It may be a jet engine that you're using. They only work in an atmosphere with oxygen.

[Vanamonde]

Are you running out of power? Engines generate electricity while they are running, but if you leave them turned off for a while, the charge on the other parts may drain to zero, leaving the craft uncontrollable.

[Peder]

Im not aware how you build the rocket, but if you have used "docking" /ports/. Then you need to be aware that docking ports/modules as standard share fuel.

So maybe the engines that first fire and burn, suck out all of the fuel from the top of the rocket. So when you try to fire the step 2, you are actual out of fuel... It is just a guess since we cannot see the rocket your build.

( right click the docking port and choose disable crossfeed ).

[astropapi1]

If you're using jet engines, they'll flameout in space, and if you're using a probe, It may be running out of electricity. You don't give us a lot of information...

[Laphtiya]

Make sure you have the engine ignition in the same stage as the separation of the old part and make sure you're throttled up (I am assuming you're maybe using SRBs for your first stage as I do for my probe missions). If it is not this have you set up a fuel share by accident? The original section is not drawing fuel from the other tanks is it?