When a car is ticking over, it is running at a low speed, typically around 750-1000 revolutions per minute (RPM). At this speed, the engine is not producing a lot of power, and the valves are not opening and closing very quickly. This can cause a ticking noise, which is often described as sounding like a "sewing machine."
The ticking noise is usually caused by one of three things:
1. Valve lifter noise: The valve lifters are small, cylindrical-shaped components that sit between the camshaft and the valves. They help to open and close the valves, and when they are worn or damaged, they can cause a ticking noise.
2. Fuel injector noise: The fuel injectors are responsible for spraying fuel into the cylinders. When they are clogged or dirty, they can cause a ticking noise.
3. Spark plug noise: The spark plugs are responsible for igniting the fuel in the cylinders. When they are worn or damaged, they can cause a ticking noise.
In most cases, the ticking noise is not a serious problem. However, if it is accompanied by other symptoms, such as a loss of power, engine knocking, or excessive smoke, it is important to have the car inspected by a mechanic to determine the cause of the noise.
2nd Gear Slowing Down
When a car is slowing down in 2nd gear, the engine is still running at a relatively high speed, typically around 2000-2500 RPM. This can cause a whining or grinding noise, which is often described as sounding like a "siren."
The whining or grinding noise is usually caused by one of two things:
1. Transmission noise: The transmission is responsible for transferring power from the engine to the wheels. When it is worn or damaged, it can cause a whining or grinding noise.
2. Wheel bearing noise: The wheel bearings are responsible for supporting the wheels and allowing them to rotate smoothly. When they are worn or damaged, they can cause a whining or grinding noise.
In most cases, the whining or grinding noise is not a serious problem. However, if it is accompanied by other symptoms, such as a loss of power, engine knocking, or excessive smoke, it is important to have the car inspected by a mechanic to determine the cause of the noise.
