What are the reasons for severe engine ignition shaking and popping sounds?
2 Answers
The reasons for severe engine ignition shaking and popping sounds are: 1. Poor sealing or burning of individual valves; 2. Carbon deposits between the valve seat and the valve; 3. Insufficient or no clearance in individual valves; 4. Overly rich air-fuel mixture; 5. Poor engine lubrication during cold starts, poor oil fluidity leading to mechanical wear and abnormal sounds, low coolant temperature, and incomplete combustion causing engine shaking and popping sounds. Solutions for severe engine ignition shaking and popping sounds include: 1. Cleaning the fuel system and checking if the idle speed motor has carbon deposits that need cleaning; 2. Checking if the spark plugs have excessive carbon deposits and replacing them if necessary; 3. Checking the fuel pressure and replacing components if needed.
My car has experienced severe shaking with a 'puttering' sound during startup, which usually has several possible causes. The most common is an ignition system failure, such as aging spark plugs with carbon buildup or a faulty ignition coil, causing a cylinder to misfire—making the engine unstable, as if missing a leg. Clogged fuel injectors are another frequent issue; insufficient fuel injection leads to incorrect air-fuel mixture ratios, resulting in incomplete combustion and shaking. Additionally, low fuel pump pressure or a dirty fuel filter can cause poor fuel delivery. A malfunctioning mass airflow sensor can also trigger similar problems. Another possibility is worn-out engine mounts, which lose their damping effect, allowing vibrations to transmit directly into the car. If this happens, it's best not to force the car to run. Instead, take it to a repair shop to scan for trouble codes first, as this helps pinpoint the specific system at fault for more targeted troubleshooting.
