Why does the car start but fail to accelerate?

[DelPenelope]

There are several reasons why a car can start but fail to accelerate: 1. Fuel supply system issues: clogged low-pressure fuel line, loose pipes causing oil leakage, air in high-pressure fuel pipe, poor technical condition of fuel injectors, incorrect fuel injection timing angle. 2. Starting device problems: power supply failure, poor contact of electromagnetic switch, poor contact between starter motor commutator and brushes, clutch slippage in starter transmission mechanism. 3. Insufficient cylinder compression pressure: cylinder gasket damage causing air leakage, valves not closing tightly leading to air leakage, piston cylinder liner wear causing air leakage. 4. Insufficient air intake: clogged air filter element.