[denisond3]

The older Jettas had a starting relay, whose purpose was to turn on the starter when the key was twisted to 'start' AND to shut off other electrical loads, so the battery was turning the starter, but not running the defroster grid or headlamps, etc. I would suppose the newer Jettas have a similar relay. If it goes bad, the car may not be getting the needed signal to the injectors - when the key is in the 'start position. My 90 Jetta wont start using the ignition key, but will when I jumper a wire to the starter. Once running it does fine.
So see if there is a 'starter relay' and check the wires to whatever block that starter relay is connected to. I had the wires come un-connected from the relay block. Just had to push them back on.