What is the reason for the Besturn B70 making a muffled sound when stepping on the accelerator without speeding up?
2 Answers
The reasons why the Besturn B70 makes a muffled sound when stepping on the accelerator without speeding up are as follows: Problems with the engine fuel pump: The engine fuel pump is damaged, resulting in insufficient fuel supply to the engine. Although the driver floors the accelerator, the engine speed increases, but the fuel injection volume is very low, and the power output of the engine is very low, naturally causing weak acceleration. Problems with valve timing: To improve engine fuel efficiency, modern engines use the CVVD valve timing system. However, if the CVVD hydraulic control system is damaged, the sealing ring leaks oil, or the CVVT does not work properly, the engine's intake and exhaust will be affected, naturally reducing the engine's combustion efficiency, and the engine's output torque will be compromised.
A few days ago, my neighbor's Bestune B70 had this exact issue - you'd press the accelerator and hear the engine roar, but the car just wouldn't move. I took a look and found it's most likely an exhaust blockage, especially common when the catalytic converter gets clogged. Worn-out spark plugs can cause this too since misfiring means no power. If the air filter hasn't been changed for ages, the engine starves for air and runs sluggishly. Also, if the transmission has slipping clutch plates or a stuck valve body, power won't reach the wheels. And let's not forget - a weak fuel pump or clogged injectors will definitely kill acceleration. Don't ignore this; get to a repair shop ASAP and scan for trouble codes to be safe.
