What Causes Engine Power Loss and Vibration?

[McRicardo]

Engine power loss and vibration can be caused by: 1. Worn or loose engine mounts; 2. Engine misfire (cylinder malfunction); 3. Excessive carbon buildup in cylinders, throttle body, spark plugs, or intake system; 4. Fuel system failure leading to lean air-fuel mixture and engine vibration; 5. Intake system malfunction. Solutions for engine power loss and vibration include: 1. Replacing brake pads and rotors; 2. Removing engine carbon deposits; 3. Improving fuel quality; 4. Replacing spark plugs; 5. Addressing insufficient cylinder compression. The engine's function is to convert the thermal energy of gasoline into mechanical energy by burning fuel in sealed cylinders to expand gases and drive piston movement.

[OAdriana]

Many car enthusiasts have asked this question, and I believe the first thing to check is the ignition system. If the spark plugs are aged or worn with excessive gaps, it can easily fail to ignite a certain cylinder, causing engine imbalance and shaking. The fuel system is also a common culprit; clogged fuel injectors or insufficient fuel pump pressure can lead to poor fuel supply, resulting in a lean mixture that makes the car struggle and shake. A dirty air filter can restrict air intake, causing the engine to lose power due to lack of oxygen. Vacuum leaks are common in older cars, where cracked hoses suck in extra air and disrupt the system. Cylinder compression issues, such as damaged piston rings or leaking spark plug threads, can be confirmed with a compression tester. It's best to first check for simple electrical leaks or use a diagnostic tool to scan for trouble codes before rushing to the repair shop. Developing a habit of inspecting these components during part replacements—like changing spark plugs every 30,000 kilometers—can prevent a lot of trouble.

[RebeccaFitz]

If you feel significant engine shaking and a noticeable drop in power while driving, it's likely due to a misfiring cylinder. I previously experienced issues like burnt spark plugs or damaged ignition coils, causing one cylinder to fail to ignite and resulting in jerky movements. Fuel supply problems are also a major concern—if the fuel pump malfunctions and pressure drops, or the injectors fail to spray fuel, the air-fuel mixture becomes too lean, causing the car to jerk during acceleration. A dirty mass airflow sensor can misread data, leading to the engine inhaling too much or too little air, disrupting its rhythm. Running the AC increases the compressor's workload, making the shaking worse. Faulty sensors like the oxygen sensor can mislead the ECU about the air-fuel ratio. Regularly cleaning carbon buildup from the throttle body reduces stuttering, and replacing worn parts prevents future hazards. Maintaining fuel quality helps avoid rapid carbon buildup—these small steps add up to safer driving.

[SanValentina]

Engine weakness and shaking are often caused by system coordination failure. Ignition component failures such as spark plugs or high-voltage coils can lead to misfires and single-cylinder shutdown. Unstable fuel supply or uneven injection causes intermittent fuel delivery and power fluctuations. Air system obstructions like clogged air filters restrict intake and reduce power. Sensor errors such as MAF misreporting air volume can cause the ECU to incorrectly control the air-fuel ratio. Mechanical issues like insufficient cylinder compression or timing deviation reduce efficiency. ECU software errors can also trigger shaking and may require a reset. A comprehensive diagnosis using a scanner can clear obstacles and ensure smooth driving.