So my 2007 2.2 Santa Fe was in service for the last 10 months for hard starting problems, in the mornings was starting only with ramp start.

Few days ago I got it back but they couldn't fix it properly.

So now the car starts perfectly but dies instantly.
Sometimes after a few tries (3-5 tries) stays alive and works perfectly until I stop it and then again dies instantly. Sometimes won't stay alive even after 30 tries.

Was in Hyundai service also for a long time, changed the whole fuel system, everything related to starting, the brain of the car but still couldn't find the problem.

Looks like a little problem, like a sensor or something.

 

What is ramp start?


If it was only that easy, it most likely would have been repaired by now.

One way to pin down the problem is with the use of a scope.
Various inputs are monitored to see which are possibly not rational or maybe non-existent.

Can you list the things they did and the parts they replaced?