Had checked multiple points to find a pattern of the problem and troubleshooted:
1) Switched to petrol and drove, car engine doesn't stop
2) Switched to petrol with AC on, car engine doesn't stop
3) Drove on petrol for some kms (5-6 km) to heat the engine up and then switched to CNG, still switching to CNG started the problem.
4) Changed car oil if any issue with it. Still the same issue
5) Air filter (inside bonnet) cleaning. Still the same issue
6) Temperature set by Lovato dealer 3 times, still the same issue
7) Checked by keeping car in neutral gear when stopped in traffic and clutch pressed OR also kept in neutral while car rolling on slope with clutch pressed, still car vibrates and same issue
8) Lovato dealer another branch tried temperature setting, raised temperature, still no luck
9) Lovator dealer checked all wiring.
NOTE: CNG kits doesn't get set/suit in all cars, your car can be one of them.
10) Also noted that when the car tire air pressure is less, car engine stops more times than normal. If the tires are inflated with correct air pressure, car engine stops less freqently due to less load on the engine.
Finding: The car reacts/behaves more bluntly/roughly while running on CNG. Putting it in another words, if there is an issue inside the car/engine, while running on CNG this problem will amplify and show up quickly to the user. The car running on petrol might be having an issue, but this issue will not come out/show up that quickly or in that proportion in which it shows up while running on CNG.
Resolution:
1) Car temperature set through the CNG kit installer.
2) Car tapet set/IOC valve change through CNG kit installer or authorized car dealer. This may require entire engine head opening, clean the valves which the car dealer will demand a big amount and keeping the car with them for 1-2 weeks.
3) If the CNG kit is in warranty period, replace the kit (ex: Lovato) with new company kit (ex: BRC). Problem resolved not 100% but till some extent (atleast 70% problem resovled; i.e car engine stopping freqency is reduced; may be once or twice in a distance of 30 kms; previously it was once every 3-4 kms)
This went on for 14-15 months.
After that, my car battery died (3 years after installation, which is fine). I turned my engine off in traffic, and when green light's on, engine did not start.
Two guys helped dragging the car at the side of the road.
I called a local car mechanic, he just connected another battery to my car battery for charging and started the engine. He told me to run the car on petrol (without stopping and engine) and reach home. After that next day, I showed up the car to the battery changer, and he replaced it with a new one.
After replacing car battery with a new one, the car engine stops freqently (25 times in 30 km distance) when running on CNG (without AC on). Starting immediately on giving first cell thereafter:
Checks:
1) Checked the wiring,plugs,sockets made by the battery changer person. Consulted him again and he checked/verified the wiring. He told as you have CNG, the CNG settings/tuning of temperature would be needed to be done again (as done during CNG kit installation)
2) Checked by running on petrol, engine stops less freqently, but still stops.
3) Called CNG kit installer person, he told you have cng sequential kit, it's settings doesnot get erased after inserting new battery.
4) Showed the car to local garage person. He just gives race to the car to test car heating up or not, added water to radiator and adds coolent in the coolent box (which was at low level, now added till full level).
Problem Detected/Resolved: Water level in radiator was less (may be car indicated in the meter) but didn't see; which resulted in car engine heating up and stopping.
4) Local garage person also told there is a leakage in some of the pipes inside the bonnet; which has resulted in coolent
spreading inside the bonnet. After washing/cleaning the leaked coolent from bonnet, he checked again by giving normal race to the car, keeping engine on for 5-10 mins; but luckily did not find any coolent coming out from any pipes. So all good now.
My car is running smoothly on CNG (also with AC on)
