What Causes the Engine to Shake When Running on Gas but Not on Petrol?
2 Answers
The reasons why the engine shakes when running on gas but not on petrol are as follows: 1. Insufficient air intake: The power of natural gas is lower than that of petrol, and the idle throttle still operates according to petrol settings, leading to insufficient air intake. 2. Gas line malfunction: It is likely caused by a blockage in the gas line. 3. Severe wear: The valves are severely worn. 4. Control valve failure: The gas control valve is malfunctioning. The reasons for engine shaking at idle but not while driving are as follows: 1. Leaks in the intake pipe and various valves: Common issues include cracked intake manifolds or poor sealing of the intake manifold. When there is a leak in the air supply system, the engine control unit receives inaccurate air intake signals, leading to misjudgment and unstable idle. 2. Excessive carbon buildup on valves and intake pipes: Since carbon deposits can absorb a certain amount of fuel, the engine control unit makes incorrect judgments, resulting in insufficient power output.
I've driven quite a few modified cars, and they run very smoothly on gasoline, but start shaking when switched to gas. This is a pretty common issue. It's mainly caused by the gas system and fuel system being out of sync. Often, it turns out that the gas injectors are dirty or leaking, resulting in a lean mixture and unstable combustion. Additionally, the spark plugs might need to be replaced with ones that have a higher heat range because gas burns at a lower temperature, which can lead to carbon buildup and uneven ignition. I recommend starting by cleaning the injectors and filters. If that doesn't work, take it to a professional shop to adjust the air-fuel ratio settings on the converter. Regular maintenance of the converter is also important, especially in winter when low temperatures make gas atomization worse, leading to more shaking. Safety first—don’t try to dismantle it yourself; just have a mechanic calibrate the wiring. Fixing these simple issues can make driving much smoother.
