What Happens When a Gas-Converted Car Switches Back to Petrol?

[DelStella]

The ignition system suffers the most damage, with the spark plugs being the most affected. Here are the detailed impacts: Reduced power and ignition capability: Since spark plugs are used for ignition, their deterioration leads to decreased power. The timing of ignition is precise, and missing the optimal ignition time results in reduced power. Incomplete combustion, increased fuel consumption: This affects the car's fuel efficiency. Insufficient ignition energy and incorrect ignition timing cause incomplete combustion, inevitably leading to higher petrol consumption. Carbon buildup, engine damage: Due to inadequate ignition performance causing incomplete combustion, significant carbon deposits accumulate on the piston tops and spark plug electrodes.

[LaGenevieve]

As an owner with several experiences of switching back from natural gas to gasoline, I'd like to share my story. My old Bora had an LPG system installed and ran on it for over two years. Later, as many nearby gas stations closed, I decided to switch back to gasoline. I went to a professional repair shop to remove the gas tank and nozzle system, which took half a day. After the conversion, I immediately noticed the engine started faster, especially during cold starts, which were much more stable. The throttle response became more direct, and the power output during acceleration was clearer. However, fuel consumption did increase by about 15%, and now I spend around 200 yuan more on gas each month. A reminder to everyone: after removing the gas system, carefully check the fuel line seals, as old connections might leak and affect the air-fuel mixture. I also took the opportunity to do an engine decarbonization cleaning, since natural gas combustion tends to leave carbon deposits. Overall, the driving experience improved, but my wallet got a bit lighter. I recommend weighing convenience and cost before making a decision. Regular maintenance is key—don't slack off.

[StHannah]

Hey, I've been there as an ordinary car owner too. I bought a used Santana that ran on CNG before – it was quite economical, but after using it for over half a year, I found refueling with gasoline more convenient, so I switched back. The mechanic helped me remove the gas equipment, which wasn't too troublesome. After switching back to petrol, the car's acceleration became more responsive, and it ran quieter on highways. But here's the catch: fuel costs shot up significantly. I used to spend just 300 yuan a month on gas, but now petrol costs are nearing 500 yuan. Another issue I noticed was that the exhaust sometimes smelled pungent after switching back. The mechanic said it might be due to residual gas mixing with the fuel and advised me to drive for a while longer to see if it improves. If you don't mind the hassle, switching back is fine, but if CNG stations are scarce in your area, sticking with petrol might save you headaches. Oh, and remember to use higher-grade gasoline to reduce engine wear.

[Reed]

Having worked in auto repair shops for over a decade, let me share the details. When converting a customer's vehicle back to gasoline, the first step is safely removing all LPG components, including the gas tank, controller, and pipelines. Cleaning the fuel system is crucial—otherwise, leaks from old connection gaps can cause air-fuel ratio imbalance, leading to engine hesitation or even stalling. The ECU needs reprogramming to adapt to pure gasoline mode. Customers often report smoother power after conversion, but fuel consumption may increase by 10%-20%. I recommend simultaneously checking the fuel injectors and oxygen sensors to ensure they haven't been corroded by gas. If there are signs of improper modification, like poor pipeline sealing, repair costs will be higher. No major driving issues, but regularly change the fuel filter to prevent clogging from impurities. Don't cut corners with removal—choose a reputable shop for safety.