What Causes Diesel Engine Shaking?

[SanMicah]

Diesel engine shaking causes: 1. A certain cylinder's injector nozzle components are stuck or atomizing poorly, causing that cylinder to not work or work poorly, which can be checked using the cylinder cut-off method; 2. Uneven idle fuel supply from the injection pump, causing uneven operation of cylinders at idle; 3. Improper idle adjustment, which can be resolved by adjusting the idle fuel supply screw; 4. Improper valve clearance causing a cylinder to not work or work poorly, which can be fixed by adjusting the valve clearance; 5. Poor valve sealing causing poor operation; 6. Engine overheating or insufficient oil, making component operation difficult; 7. Severe engine carbon buildup, with the solution being to clean the fuel system and idle motor carbon deposits.

[MacAnnie]

Diesel engine shaking can involve multiple factors. As a long-distance driver, I've encountered similar situations several times, mostly caused by fuel system issues. A clogged fuel filter can lead to poor fuel supply, causing noticeable engine shaking during acceleration. Carbon buildup in fuel injectors can also cause uneven fuel injection, especially in older vehicles. Another possibility is abnormal operation of the high-pressure fuel pump, resulting in inconsistent fuel supply to each cylinder. A dirty air filter affects air intake, particularly in areas with poor air quality. Additionally, worn or damaged engine mount bushings reduce vibration isolation, leading to noticeable shaking. It's recommended to prioritize checking the condition of the three filters and, if necessary, clean the fuel system, as these are relatively easy routine maintenance tasks.

[LeonardoLee]

After driving diesel trucks for ten years, I've found that engine shaking is most commonly caused by abnormal fuel supply systems. A clogged diesel filter leading to insufficient fuel pressure can cause intermittent engine vibrations. Poor fuel quality can also lead to carbon buildup and clogging in the fuel injectors, often accompanied by black smoke. Incorrect valve clearance, whether too large or too small, requires professional adjustment. Uneven cylinder pressure results in unstable power output, especially noticeable when climbing hills. I've also encountered faulty crankshaft position sensors causing inaccurate ignition timing, which triggers the engine warning light. My usual approach is to first inspect the fuel system, replace the filter, and use standard diesel fuel. If the issue persists, I then check the electrical and mechanical components.

[SanRachel]

Last month my diesel SUV suddenly started shaking, and the repair shop said it was a fuel system issue. Unstable operation of the high-pressure fuel pump can cause diesel pressure fluctuations, especially noticeable during cold starts. When the idle control valve gets stuck due to carbon buildup, the RPM fluctuates and the vehicle shakes. If a fuel injector is clogged, that cylinder won't function properly, causing vibrations. An intake manifold leak can also disrupt the air-fuel ratio. The most troublesome issue is internal engine problems, such as worn piston rings leading to insufficient cylinder pressure. It's recommended to get it checked promptly, as prolonged shaking may damage other components.