when the light keeps blinking does your car keeps running on patrol or it actually switched onto CNG?
Trying to understand that is it just a light blinking issue or the whole switching issue.
Furthermore there are few switches for EFI cars which doesn't require pushing accelerator for switching but there is a delay is switching so after few seconds it converts patrol to CNG and that delay is configurable by tightening or loosing the screw at the back side of switch. I've noticed that delay can be set for very long time as well as for very short time, even you just do the ignition on before actually starting the car it switches to CNG and then car gets started on CNG right from the start.
Regarding baleno and liana its different and related to RPM settings.