Need opinion on how to resolve
I have a grand i10 AT from 2014. 78k odo.
I installed CNG (thanks to gatkari) because i got 8kmpl in chennai traffic. Everything seemed fine , I had to replace iridium plugs, new ignition coils and cables.
Car was running fine for a month post cng installation. From last week, it is stalling randomly when I am coming to stop on coasting.
Once this happens, when I restart the car, the tacho is stuck at 0 even with engine on, the speedo is stuck around 40 even while stationary.
If I rev it hard, the cluster goes back to working. Also, when this happens, when I accelerate, the engine feels a shudder like its minor misfire.
Everything is back to normal when I revv up past 3-4k rpm. I checked battery, replaced it yesterday as it was 3y old and had salt around the terminals.
Also to note, this happened around 10 times and out of thatt 9 times were on cng and once was on petrol.
Poor grounding seems to be the culprit or some CAN wiring issue or any sensors.
Not sure what to look into without turning the car into a money pit. Please help me out.