What Are the Reasons for Increased Engine Noise After Car Maintenance?
4 Answers
Car maintenance after the engine sound becomes larger reasons are: 1, when replacing the oil did not completely drain the old oil; 2, the new oil added viscosity is too low. Car maintenance after the engine sound becomes larger solutions: 1, check the oil level, if the oil is added less, add a little oil; 2, if the oil is not added less is the oil viscosity is too low, need to replace the higher viscosity oil. The role of oil is: 1, reduce the wear between the piston and cylinder, the main shaft and bearing, play a lubricating role; 2, auxiliary engine internal cooling; 3, clean the engine parts on the carbon, sludge, wear metal particles impurities; 4, reduce gas leakage and prevent external pollutants from entering; 5, shock absorption buffer piston, piston chips, connecting rod and crankshaft bearing load.
After my last maintenance, I also noticed that the engine noise became significantly louder. Upon careful consideration, there could be several reasons. First is the issue with engine oil. If oil with a different viscosity was used or the amount added was inappropriate—either too high or too low—it could lead to poor lubrication, causing increased friction noise during engine operation. Secondly, the air filter might not have been installed tightly. If the sealing ring of the newly replaced filter isn’t pressed firmly, increased air intake can result in noise. The newly replaced spark plugs might have incorrect gaps, making the popping sound during ignition more noticeable. The belt tension adjusted during maintenance might be too loose or too tight, causing a squealing noise during operation. Additionally, some parts might have been loosened during maintenance, such as the engine cover not being securely fastened, making the noise more prominent under vibration. I recommend first checking the oil dipstick to see if the level is normal, then re-inspecting the filter and belt positions. If the issue persists, promptly return to the service center for a recheck to avoid engine damage. When I encountered this situation, timely handling prevented any major problems.
After the maintenance, I feel like the engine sound has suddenly become louder. Maybe it's just psychological, as I'm more focused on listening to the car's sound changes right after servicing. However, there are several possible reasons: the new type of engine oil might have a higher viscosity, increasing operational resistance; the air filter might not be installed properly, causing intake noise; incorrect installation angle of new spark plugs could lead to abnormal ignition; or improperly adjusted belts might squeak at idle. A simple self-check is recommended: open the hood to check for any oil leaks or loose parts, ensure the oil level and color are normal, and confirm the air filter's seal is tightly pressed. Most of the time, these minor issues can be adjusted by yourself. But if the noise persists, it's advisable to return to the service center for inspection. Safety first—don't let abnormal sounds affect your driving.
After maintenance, increased engine noise is often related to oil issues: the newly replaced oil has unsuitable viscosity or insufficient quantity, leading to inadequate lubrication and increased friction noise; poor sealing of the air filter, amplifying intake noise; incorrect installation of spark plugs after replacement, causing significant ignition gap deviation; incorrect belt tension adjustment resulting in abnormal operating noise. These are details easily overlooked during maintenance. First, check basic items such as oil level and filter tightness, which usually alleviate the issue. If not resolved, seek professional assistance for further troubleshooting.
