Why does the car sometimes feel underpowered?
1 Answers
The reasons for a car feeling underpowered are as follows: 1. Insufficient fuel supply: The return oil control valve in the pump cover oil passage is not tightly closed, causing unstable engine operation. In severe cases, the engine may stall under slight load and become difficult to start. 2. Fuel leakage in the fuel line: Air entering the system or a clogged fuel filter can obstruct fuel flow, resulting in weak engine performance. 3. Leakage due to damaged sealing copper gasket of the delivery valve: The delivery valve not closing tightly or a broken delivery valve spring can reduce fuel supply, leading to an underpowered engine. 4. Worn plunger pair causing insufficient fuel supply: This is often accompanied by difficulty starting and unstable operation at low throttle. Additionally, sluggish movement of the plunger or roller body, or weak plunger spring tension, can also affect fuel supply and weaken engine performance. 5. Loose plunger adjusting arm: A broken plunger spring or loose adjusting fork on the fuel supply lever can also impact fuel supply, causing the engine to feel underpowered. 6. Fuel injector leakage or clogged nozzle: Poor atomization quality and incomplete combustion after injection can result in weak engine performance, accompanied by knocking sounds and black smoke from the exhaust pipe.
