What Causes Sudden Engine Stalling During Normal Driving After CNG Conversion?

1 Answers
DelHaven
07/29/25 4:45pm
The main reason for sudden engine stalling during normal driving after CNG conversion is fuel system issues. Below are relevant explanations and solutions: 1. Fuel system problems: During normal engine operation, the fuel pump draws fuel from the tank, passes it through the filter into the distribution line, and then sprays it through the injectors to form an air-fuel mixture. In this process, the fuel pump and injectors are the most prone to failure. Solution: Clean the fuel system, use gasoline with the correct octane rating when refueling, and ensure timely fuel replenishment. 2. Throttle body blockage: The throttle body is a component prone to issues. If frequent throttle cleaning doesn't resolve stalling problems, it usually indicates a malfunction. Additionally, check the vacuum pump to ensure proper air intake volume. 3. Sensor failure: Faulty sensors causing ECU protective fuel cutoff. Check whether all sensors and actuators are functioning properly, with key sensors including the throttle position sensor, oxygen sensor, and crankshaft position sensor. Solution: Conduct comprehensive diagnostics, focusing on spark plugs, fuel pump, and oxygen sensor, followed by ECU matching.
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