What are the reasons why a car cannot accelerate?
2 Answers
The reasons why a car cannot accelerate are: 1. Fuel supply system failure: The biggest power source for car acceleration is the engine, and the engine operates by fuel propulsion. Therefore, if there is an issue with the fuel supply system, the speed cannot increase normally during rapid acceleration; 2. Failure to control fuel pressure, fuel injection quantity, or ignition timing as required. If these three aspects do not meet the specifications, it is very likely that the car's speed cannot be increased; 3. Problems with spark plugs and high-voltage wires: Spark plugs and high-voltage wires are important components of a car. The main function of spark plugs is to generate sparks to ignite the mixed gas in the cylinder, thereby increasing the car's speed. Therefore, when there are problems with spark plugs and high-voltage wires, rapid acceleration may not result in an increase in speed.
I've been driving for over ten years and have encountered many issues with slow acceleration. The most common one is excessive carbon buildup in the engine, especially when driving at low RPMs in the city for long periods. The throttle body and fuel injectors get coated with a thick layer of carbon like soot from a pot, leading to insufficient air intake and a sluggish throttle response. Fuel system problems are also frequent—clogged fuel filters or aging fuel pumps causing low fuel pressure can make the car feel weak. Many people overlook tire issues; low tire pressure increases rolling resistance, like trying to run in slippers. For automatic transmission cars, if the transmission fluid deteriorates, gear shifts become jerky, naturally slowing down acceleration. I once drove an old Jetta that had a completely blocked exhaust—the ceramic honeycomb in the catalytic converter shattered and clogged the exhaust pipe, making the engine struggle to breathe. This kind of issue requires an inspection with a borescope at a repair shop. I recommend checking tire pressure monthly and cleaning the throttle body every 20,000 kilometers.
