What to Do When Oil-to-Gas Conversion Engine Runs Normally on Oil but Misfires on Gas?
2 Answers
Switch the engine to gas operation mode, then cut off the gas supply to each cylinder individually. If cutting off gas to a particular cylinder doesn't cause noticeable changes in engine operation, it indicates that cylinder is misfiring. Assuming the third cylinder is identified as misfiring through the above step, pull out the gas line and check if gas sprays out. If gas sprays out, it indicates a power supply system failure. Swap the power supply lines between the second and third cylinders, then repeat the first step to observe whether the third cylinder returns to normal operation while the second cylinder starts misfiring. After confirming the power circuit fault, systematically inspect the third cylinder's power supply circuit for issues such as short circuits, poor contacts, or loose connectors, and replace as needed.
I've dealt with many oil-to-gas converted vehicles before. If it runs normally on gasoline but misfires on gas, it's usually an issue with the ignition system or gas supply. Natural gas combustion requires higher ignition energy, so I recommend checking the spark plugs and ignition coils first to see if aging is causing weak sparks when running on gas. Clogged or improperly installed gas injectors can also lead to insufficient gas supply to certain cylinders—they can be removed for cleaning or replacement. ECU tuning is crucial; poorly configured control programs after conversion can cause misfires, so have a professional shop reflash it using diagnostic equipment. Gas line leaks are a safety hazard—check for bubbles with soapy water immediately. Don't attempt DIY fixes; 80% of such issues can be quickly resolved at a professional shop. Post-conversion, servicing every six months can prevent trouble. Safety first—if the car shakes due to misfiring, don't force it; park and inspect it properly.
