A few days ago I replaced my upper coolant hose due to a leak. After replacing the hose, I decided to pour distilled water in the coolant reservoir ( so that I don't just waste any coolant ) just to see if there are any more leaks. I attempted to start the car, but now after it starts, it stays on for a few seconds then it sounds like it's struggling to stay on, it revs itself for another second or two then dies. Could it be that it is struggling to stay on solely because of the distilled water?
I have ISTA+ it if it helps, I'm just not too familiar with it on how to use it to diagnose the problem.