So heres my headache, the short short version.
I had a water pump belt fail which I DIY'd and replaced (replaced the pump too, **** what a bitch). At the same time I also preformed a valve decarb since I had the intake manifold off.
After putting everything back together (new seals and whatnot) when I start the engine the starter doesn't stop cranking after the key is released after it springs back to the normal running position.
I have vag-com and can see that the ignition switch is changing values when the key is set to 'start' and back 'run' so I don't think it is a ignition switch problem. I can stop it by turning the car off.
I thought I was pretty careful when hooking up the wiring during re-installation, I don't think i missed any connectors or mis-wired it (but if course that could be possible).
It seems like the starter is getting a signal to crank but never gets on to stop cranking. Vag-com doesn't really show any issues with implausible signal or shorts.
If anyone has any thoughts or suggestions i'd love to hear them, no matter how obvious.
2010 GTI - 166K - 2.0tsi CFBA