Surely there have been many times when you have encountered car jerks when slowing down. There are many causes for this to happen: warped propellers, poor brake boosters or faulty brake calipers.
In any situation, you need to stop the car to the side of the road and check the vehicle. The next part of the article will give you 14 causes of why does my car jerk when slowing down that you may not know.
Why does my car jerk when slowing down? Causes and Fix
When driving, in addition to you experiencing jerky when braking, it is likely that your car will also appear jerky when slowing down. This situation stems from the following 5 reasons:
When you decelerate your car and there is a jerk, it is most likely a sign of problems related to the transmission: TCM or valve stem. This problem appears in both manual and automatic transmission when you try to adjust the speed to suit you. At this time, please move the car to the nearest repair facility for inspection assistance.
Faulty MAF Sensor
The MAF air flow sensor is the next cause of your engine jerking when decelerating. This unit has the main task of determining the engine’s ECM/PCM ratio, providing feedback on the amount of air through the intake manifold.
Compromised Ignition Coils
The ignition coil is responsible for providing sparks to the cylinder. Therefore, when this part fails, it will lead to false spark supply at low speed. This phenomenon occurs not only when you are driving at high speed, but at low speed you can also experience it. The reason is because the load of the engine has been significantly reduced.
Sticking Throttle Body
One of the reasons why your car jerks when decelerating is due to the throttle body. The throttle body has an important job in measuring all the air entering the intake manifold, serving the combustion process.
When the throttle body is sticky, it will not function properly and meet the needs of the engine. As a result, jerking occurs when decelerating.
One of the common causes of car hair loss is a vacuum leak. After a period of using the car, the vacuum part of the engine may leak, causing serious fire consequences. You will feel it clearly when decelerating.
Car That Jerks When Braking: Common Causes
Here are 5 main reasons why this situation appears in your car.
Warped brake discs are the first cause of your car jerking when you brake or accelerate. After a period of use, the brake rotor part will deform due to excessive heat and excessive corrosion.
You can feel this phenomenon clearly when the brake pads of the car are pressed against the brake rotor. It will cause noticeable vibration.
ABS valve is an anti-lock braking system. It will cause a jerk when you stop the car. If you stop the car suddenly in wet driving, this brake jerking effect will be nothing to worry about.
However, if the ABS system operates with random stops, even when your vehicle brakes, you will need further diagnostics.
Compromised Brake Booster
The brake booster works by controlling the diaphragm in a vacuum environment. When this diaphragm fails, it can cause an unexpected brake jerking effect.
At this point, stop the car and ask for help from the rescue team. Do not attempt to drive in this case. It will endanger both you and the vehicles around.
Seized Brake Caliper
Strong brake calipers are the cause of your car jerking when braking. These unusual jerks are the result of the binding process that takes place.
When the brake pads of the vehicle add to the corresponding rotors, it causes brake jerking. In addition, this phenomenon will also be accompanied by noise you can hear.
Worn steering/Suspension bushings
Each vehicle can use a variety of bushings. It has the effect of significantly reducing vibrations at the front of the vehicle. Over time, these bushings will tend to wear out significantly. It creates a lot of vibrations for cars without sound. This phenomenon will appear commonly when you brake the car.
Car That Jerks When Stopped: Common Causes
Ignition System Issues
The ignition system is what causes you to experience vibrations when idling or stopping. It can come from worn spark plugs, faulty coil packs, and aging spark plug wires. In addition, in older vehicles, the rotor stopper or distributor cap can wear out or be damaged. It is what causes you to experience abnormal jerks.
Fuel Delivery Problems
Fuel supply problems are usually detected when you are idling. It is caused by a problem in the engine fuel system. Normally, a vehicle can have many problems: faulty fuel pressure regulator, faulty injectors, clogged fuel filter, etc. These problems are easily noticeable when you stop. red light or parking.
Inefficient Air Delivery
When the engine is running, it always requires a clean, steady supply of air to facilitate normal operations. When an engine is underpowered at any time, it will directly affect combustion efficiency and overall efficiency will be significantly reduced.
You can detect an ignition failure easily when you leave the car in idle or idle mode. The cause can come from a lack of throttle body or from a dirty, clogged air filter.
Vacuum leaks are the most common cause of abnormal idling. It causes air to enter the engine unchecked. As a result, combustion efficiency is significantly reduced, engine efficiency is reduced to the lowest level.
- Clogged Fuel Injectors: Fuel injectors are responsible for delivering fuel to the engine. If they become clogged, the fuel flow can be reduced, causing the engine to stall or jerk when you come to a stop.
- Malfunctioning Idle Control Valve: The idle control valve regulates the engine’s idle speed. If it becomes dirty or malfunctions, the engine can stall or jerk when you come to a stop.
- Failing Ignition System: The ignition system is responsible for starting and running the engine. If any of the components fail, such as the spark plugs or ignition coil, it can cause the engine to jerk when stopped.
Why does my car jerk at 25mph when I’m slowing down?
It is an indication that the car’s electronic sensors or a faulty solenoid. The MAF intake air flow sensor is an important part of the engine system. It has the main task of determining the amount of air intake mixed with the fuel before combustion.
Should I be worried if my car is jerking?
When you realize your car jerks when accelerating, it’s a problem you won’t be able to ignore. It is a sign that the car has many problems such as dirty fuel injectors, ….
How do I stop my car from jerking when I stop?
You need to determine what caused this to happen. Only then can you overcome the jerky situation when stopping the car. The reasons for this situation to appear are mentioned in the content of the article.
Is jerking a transmission problem?
Gearbox jerking is a common problem you may encounter while driving. You will feel your car shifting strange gears when accelerating.
Is it safe to continue driving my car if it jerks when I slow down?
It’s generally not recommended to continue driving your car if it’s jerking when you slow down, as this could be a sign of a serious mechanical issue. You should take your car to a mechanic as soon as possible to diagnose the problem and prevent further damage.
Hopefully, the article will help you better understand the why car jerk when slowing down. This situation stems from a variety of causes.
Whatever part it comes from, you still need to stop the car and find the cause. Because driving jerky when decelerating will be very dangerous for both you and the surrounding vehicles.