What Causes Engine Vibration While Driving?
2 Answers
Reasons for feeling engine vibration while driving are as follows: 1. Engine mount aging or loosening: Engine mounts are rubber blocks placed between the engine and the frame. If they age or loosen, engine vibration becomes noticeably abnormal. 2. Engine misfire: This mainly refers to one or more cylinders not functioning properly, typically manifested as intermittent exhaust flow, severe shaking of the exhaust pipe, and noticeable engine vibration, sometimes accompanied by a sputtering sound. 3. Carbon buildup: Excessive carbon deposits inside the engine can reduce ignition energy and intake efficiency, ultimately causing symptoms like engine vibration and weak acceleration. 4. Fuel system malfunction: Using incompatible fuel grades can decrease the car's power output and performance; or a clogged fuel tank vent, fuel tank switch, fuel filter, or fuel line between the tank and carburetor can restrict fuel supply, leading to a lean mixture and engine vibration. 5. Intake system malfunction: Long-term use without cleaning can clog the air filter, reducing air intake and causing an overly rich combustible mixture, which decreases engine power. 6. Cold start: During a cold start, the engine's lubrication is poor, the oil is less fluid and more viscous, leading to mechanical wear noises. The coolant temperature is low, the mixture is rich, and incomplete combustion can cause engine vibration.
Last time my car was shaking, it turned out to be an ignition system issue. I drove it for seven or eight years before realizing that worn-out spark plugs could cause this, especially noticeable during cold starts and idling. After replacing the spark plugs and high-tension leads, the shaking stopped immediately. Another possibility is excessive carbon buildup clogging the fuel injectors, which is common with frequent city traffic congestion. Oh, and a damaged engine mount can also cause shaking—when the rubber deteriorates, it can't support the engine vibrations. If the car shakes during hard acceleration, you should check the fuel system; a failing fuel pump causing inadequate fuel supply can be troublesome. In short, don't delay—last time I ignored the shaking for two weeks and ended up paying much more for repairs.
