What Causes the Engine to Buzz When Accelerating and Have Slow Speed Increase?
2 Answers
Reasons for the engine buzzing when accelerating and having slow speed increase: 1. Engine fuel pump issues: A damaged engine fuel pump leads to insufficient fuel supply. Even if the driver floors the accelerator, the engine speed increases, but the fuel injection volume is low, resulting in low engine output power, naturally causing weak acceleration. 2. Valve timing problems: To improve fuel efficiency, modern engines use CVVD valve timing systems. However, if the CVVD hydraulic control system is damaged, seals leak oil, or CVVT malfunctions, the engine's intake and exhaust are affected, naturally reducing combustion efficiency and diminishing engine output torque.
I had the same issue with my car before. When I stepped on the gas, it buzzed like a mosquito, but the speed just wouldn't go up—it was so frustrating. When I took it to the repair shop for a check, I found out the air filter was clogged like an airtight wall, starving the engine of air and leaving it powerless. If cleaning the filter doesn’t fix it, there’s an 80% chance it’s a fuel system problem—either the fuel filter is clogged or the injectors are dirty. If the engine isn’t getting enough fuel, how can it accelerate? Worn-out spark plugs are also troublemakers; if the ignition timing is off, the engine throws a fit. And if the exhaust pipe is blocked—say, the catalytic converter is clogged with carbon buildup—the exhaust can’t escape, and the car definitely won’t move. Better fix it sooner rather than later, or your fuel consumption will skyrocket and your wallet won’t be able to take it!
