Why Does the Car Jerk and Lack Fuel When Starting in First Gear?
2 Answers
Reasons for jerking and fuel shortage when starting in first gear are as follows: Low Engine Temperature: Especially during cold starts in winter, the temperature inside the engine is insufficient, and both fuel and lubricant temperatures are low. Therefore, more fuel should be injected during cold starts to meet power requirements. Poor fuel atomization at low temperatures leads to reduced ignition energy, affecting performance and causing the car to shake. Carbon Deposits in Engine and Intake Manifold: Carbon deposits can absorb a certain amount of fuel, causing the ECU to make incorrect judgments. For example, if the computer controls the injection of 100 parts of air-fuel mixture, but only 90 parts actually enter the cylinder, with 10 parts absorbed by carbon deposits, even if the remaining 90 parts burn completely, the required power output will still not be achieved. Ignition System Malfunction: Aging of the ignition system leads to weakened ignition energy, causing the ignition coil or spark plugs to fail to ignite continuously or to experience intermittent ignition. This intermittent ignition results in uneven power output, leading to jerking when accelerating the car.
I've been driving manual transmission cars for over a decade, and this kind of jerky first-gear start with insufficient fuel supply is very common. It's usually caused by ignition system issues, such as worn-out spark plugs from prolonged use or faulty ignition coils, leading to unstable ignition and rough engine operation. Combined with insufficient fuel supply, it's more prone to shaking or stalling. I recommend checking your spark plugs first - if they haven't been replaced after 50,000 kilometers, change them immediately. Regular maintenance of ignition components, like inspections every 20,000-30,000 kilometers, can significantly reduce failure rates. An engine in this condition makes starting difficult, wastes fuel, and getting it fixed early will make your driving smoother and safer.
