What Causes Vibration After Changing Spark Plugs?
3 Answers
The reason for vibration after changing spark plugs is that the spark plugs were not tightened properly. Therefore, the torque applied when replacing spark plugs should be based on the required torque for the specific spark plugs being used. Steps for replacing spark plugs: Open the hood, lift the engine's plastic cover, remove the high-voltage distributor wires, and mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. When removing them, check for external debris such as leaves or dust, and ensure everything is cleaned thoroughly. Place the new spark plugs into the spark plug holes, hand-tighten them a few turns, and then use the socket to tighten them further. Reinstall the removed high-voltage distributor wires according to the firing order, and then secure the cover. Spark plug replacement intervals: Under normal maintenance conditions, spark plugs should be replaced every 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it's recommended to follow the owner's manual. The following standards can be used as a reference for maintenance and replacement: Platinum spark plugs should be replaced at 40,000 kilometers, standard nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers.
Last time I changed the spark plugs myself, the car also experienced shaking. At first, I thought it was a minor issue, but upon closer inspection, I found that the spark plugs were not tightened properly during installation, causing uneven ignition due to looseness. If the spark plug gap is too large or too small, it can also lead to unstable combustion, making the engine shake continuously. Additionally, using spark plugs of an incompatible model can amplify problems due to voltage differences or ignition delays. I also noticed that if the ignition coils are aged or damaged and not replaced, poor synchronization can worsen the shaking. It's recommended to use a torque wrench to tighten them according to the manufacturer's specifications and ensure the correct model is used. Check if the air filter and fuel filter are clogged, as these can indirectly affect performance. Addressing these issues early can save fuel and ensure safety.
After changing the spark plugs, my car shakes violently. The first thing that comes to mind is improper installation or incorrect model. If the spark plugs are too loose or too tight, ignition problems will occur; improper gap adjustment will mess up combustion. When I did it myself, I found that not replacing cracked or worn coils could also cause synchronization issues. It's best to look up the original factory parameters online and use the correct tools—don't skip this step. If the shaking persists, don't push it—check the engine sensors or fuel system immediately, as air intake blockages could also be related. Prolonged shaking is bad for the engine, wastes fuel, and is dangerous. It's safer to take it to a reliable repair shop for a check.
