What are the reasons for severe engine ignition shaking and popping sounds?
3 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.
That time when I was driving my old car, it suddenly started shaking like a massage chair, with a very noticeable sputtering sound. After some research on my own, I found that it was mainly caused by uneven cylinder operation. The key is to check the ignition system. Spark plugs need to be replaced after about 40,000 to 50,000 kilometers, otherwise, the gap increases and the ignition energy becomes insufficient. Ignition coils are particularly prone to failure, especially in rainy or humid conditions. If one fails, it can cause a misfire in one of the cylinders. Additionally, it's important to check the fuel injectors. If the nozzle is clogged with gum or carbon deposits, the fuel atomization will be poor, leading to incomplete combustion in a cylinder, which can cause this issue. A vacuum leak could also be the culprit. If the hoses age and crack, extra air enters the intake, making the air-fuel mixture too lean and causing shaking. Moreover, if the engine mount bushings are cracked, the vibrations are directly transmitted to the body, making them very noticeable. My suggestion is to try replacing the spark plugs first. If that doesn't work, then check the fuel and electrical systems.
