Causes of poor acceleration of cold car

Causes of poor acceleration of cold car

Idle jitter of cold car

If the cold car idle jitter and the hot car idle jitter exist at the same time, the hot car idle jitter fault should be eliminated first. To define whether it belongs to jitter, it is necessary to observe whether the pointer of the engine tachometer swings or read the engine speed in the data block, because engine idling jitter can also occur when the engine foot pad is damaged, especially after the automatic transmission is engaged in the forward gear.

The reasons for idling jitter of cold cars are:

1, engine mechanical failure. For example, the pressure of each cylinder is uneven;

2, air intake system failure, such as air intake pipe leakage, etc. Excessive carbon deposition in the intake valve and intake pipe, excessive dirt on the inner wall of throttle valve and intake pipe, etc.

3. Engine management system failure. For example, the water temperature and intake air temperature signals are incorrect, and the line is faulty.

4. The ignition system is faulty. For example, the spark plug has too much carbon deposit or the gap is wrong, the high-voltage line and distributor cover leak electricity, and the ignition coil is damaged.

5, oil supply system failure. For example, due to excessive colloidal carbon deposition in the nozzle, the nozzle is not tightly closed or blocked.

Poor acceleration of cold car

Although many automobile manufacturers' user manuals indicate that the cold car can be started without preheating, the author thinks that the engine can be warmed up slightly after starting.

3-5 minutes is of great benefit, because for small displacement vehicles, it can reduce the mechanical wear of the engine and make the engine have sufficient power when starting. It is a wrong driving method to turn on the air valve to start the cold car. At this time, the acceleration of the car can be avoided. If the cold car starts to refuel slowly, it is a fault.

The reasons for the poor acceleration of cold cars are:

1, engine mechanical system failure. For example, the low cylinder pressure leads to the decline of engine power, which is more prominent in the cold car state, and the carbon deposition in the intake valve and intake pipe is too much;

2. Excessive carbon deposition in the intake valve and intake pipe. The injected gasoline is adsorbed by carbon deposits and cannot enter the combustion chamber;

3. Engine management system failure. For example, the water temperature and intake air temperature signals are incorrect, and the line is faulty.

4. The ignition system is faulty. For example, the spark plug has too much carbon deposit or the gap is wrong, the high-voltage line and distributor cover leak electricity, and the ignition coil is damaged.

5, oil supply system failure. For example, due to excessive colloidal carbon deposition in the nozzle, the nozzle is not tightly closed or blocked.