What is the reason why the Changan car sometimes cannot accelerate?

[McRyder]

When the throttle cannot accelerate, it is generally directly related to the working condition of the engine ignition system and the electronic fuel injection system. For example, ignition timing that is too early or too late, weak sparks, or an overly rich or lean air-fuel mixture can all cause the engine to lack power during acceleration. The specific reasons for intermittent engine misfires are as follows: 1. Ignition System: Aging of the ignition coil and spark plugs can cause the ignition system of the cylinder to fail. Problems with the ignition coil are also most likely to result in a drop in power, and in severe cases, can cause the engine to stall instantly. 2. Cylinder Wire Wear: To check whether the cylinder wires are functioning properly, simply pull out the cylinder wires (no screwdriver needed), insert a spark plug, start the engine, and compare each cylinder to identify the issue. 3. Fuel Injection System: Clogged fuel injectors or fuel lines can prevent sufficient fuel from being supplied to the cylinder for combustion, naturally causing the cylinder to malfunction. 4. Excessive Spark Plug Carbon Buildup: Long-term poor combustion leads to carbon deposits accumulating at the spark plug ignition point. When these carbon deposits are moistened by fuel, they create a parallel shunt resistance, resulting in spark plug leakage, weak sparks, or even spark plug failure.

[Hector]

I've also experienced situations where the throttle doesn't respond when pressed while driving, which is quite annoying. It could be a problem with the fuel system, such as an aging fuel pump or clogged fuel injectors, leading to insufficient fuel supply. A dirty air filter can also restrict air intake, causing the engine to struggle with acceleration due to insufficient air. There might also be faults in the electronic control system, like a faulty throttle position sensor, where the ECU can't control the throttle properly without receiving the correct signals. Transmission issues are not uncommon either; if shifting isn't smooth, it can hinder acceleration. I suggest first checking the air filter yourself and trying to replace it with a new one. If the problem persists, take it to a repair shop for a comprehensive inspection. Safety first—don't delay and risk bigger problems.

[MacIvan]

As a car enthusiast, I believe that poor throttle response is often caused by ignition system or sensor failures. Worn spark plugs or faulty ignition coils can lead to incomplete combustion and reduced power. If the throttle position sensor or oxygen sensor malfunctions, the ECU may misjudge the throttle opening. Dirty transmission fluid or clutch slippage can also result in weak acceleration. You can use an OBD scanner to read trouble codes and pinpoint the issue. Regularly replacing spark plugs and cleaning the throttle body can prevent this problem - it's cost-effective but delivers noticeable improvements.

[CameronRose]

Having driven for decades, sudden unresponsiveness to throttle is extremely dangerous and requires immediate attention. Common causes include clogged fuel filters or malfunctioning throttle pedal sensors leading to signal interruption. Faulty mass airflow sensors can also restrict engine output. For safety, if this occurs, first pull over and inspect simple components like blown fuses. Regular maintenance is crucial – for instance, replacing air and oil filters every 5,000 kilometers can significantly reduce such failures.