If your car jerks when accelerating – you are absolutely not the only one.
This is a widespread problem when it comes to cars because many different failed engine components can cause this problem.
A car engine needs the right air-fuel ratio to run efficiently. If there is an imbalance in this ratio, the car engine skips one of its combustion cycle processes and ends up misfiring.
10 Causes of why your Car Jerks When Accelerating
- Dirty Air Filter
- Dirty or Faulty MAF Sensor
- Clogged fuel filter
- Faulty fuel pump
- Faulty fuel injector
- Bad spark plugs
- Faulty EGR valve
- Bad ignition coils
- Clogged catalytic converter
- Transmission problems
These are the most common causes of why your car jerks when accelerating, but let’s go a little bit deeper into it.
Here is a much more detailed list of the 10 common reasons why your car jerks when accelerating.
Dirty Air Filter
The air filter makes sure that the engine always gets fresh air without getting any dust or other dirt through the engine, which can damage it seriously.
The air filter should be replaced regularly, and if it hasn’t been done in a while, it can get filthy, especially if you live in a very dusty place. Checking the air filter is easy to do – so check it and replace it if it is terrible.
Dirty or Damaged Mass Air Flow Sensor
The mass airflow sensor measures the air entering the engine. This sensor can collect a lot of dirt through the years, making it read a false amount of air into the engine.
This can cause a faulty air-fuel mixture, which can cause your engine to start jerking on acceleration. Remove the mass airflow sensor and clean it carefully with an electrical cleaner. Replace it if you suspect that it is faulty and have done proper research.
Clogged Fuel Filter
A clogged fuel filter is absolutely not a rare problem. Dirt and dust come into the fuel tank every time you refill your car, and it can even come with the fuel.
If the fuel filter gets clogged, the engine won’t get enough fuel to function properly, and you may experience jerking and hiccups when trying to accelerate.
Replacing the fuel filter is often pretty cheap and easy to do, so if you haven’t done it in a while, you should replace it.
Faulty Fuel Pump
A faulty fuel pump can cause similar problems as a clogged fuel filter, which leads to lean-mixture for the engine. The fuel pump is often located inside the tank and pretty difficult to replace.
This means that you should be pretty sure that the fuel pump is faulty before replacing it. One way to check it can be to install a fuel pressure gauge on the fuel rail to measure the fuel pressure.
Faulty Fuel Injector
The fuel injectors control the amount of fuel entering each cylinder. You have one fuel injector on each cylinder.
If one of the fuel injectors goes bad, you will experience misfires, resulting in jerking while you are trying to accelerate your car.
This is not a very common problem though, you be sure that they are broken before replacing them.
Bad Spark Plugs
The spark plugs control the ignition in the combustion chamber, and without them, your car won’t run at all.
Spark plugs get worn over time, and a faulty spark plug can result in misfires, which can cause jerking on acceleration. They are pretty easy and cheap to replace, so if you haven’t done it in a while, you should absolutely do it.
Faulty EGR Valve
The EGR valve controls the exhaust gases, which should be recirculated into the car engine. If it releases too much or too little exhaust gases into the intake – your air-fuel mixture might get wrong, which will cause misfires.
On some cars, it is possible to plug the EGR valve pipes. If possible – try to remove the EGR connector and plug the pipe to see if the problem is getting better.
Bad Ignition Coil/s
The ignition coil gives spark to the spark plugs, and as you might understand, a bad ignition coil can cause serious misfires.
Some cars have separate ignition coils, and some have one for all cylinders. If you have separate ignition coils, it can be one or two faulty ones. Check the trouble codes for any specific cylinder the misfires occur on – and replace the ignition coil on the given cylinder to see if that is the problem.
Blocked or Clogged Catalytic Converter
The catalytic converter is helping your car going through the emission tests and giving us a better environment. Unfortunately, the internal parts of the catalytic converter can sometimes become loose.
This can cause the exhaust pipe to become blocked and create too much back pressure in the exhaust system – which will make your car jerk on acceleration.
Try to remove the catalytic converter and inspect it to see if it is clogged or if you can see any loose parts.
When your car jerks when accelerating, it doesn’t have to be a problem with the engine, actually. In some rear cases, it can be a problem with the transmission or gearbox.
It can be a slipping clutch or something else damaged in the transmission. Transmissions are complex things, so if you think it is a problem with it – you do best to let a professional mechanic handle it instead.
Hi, I’m Magnus, the owner and the writer of Mechanic Base. I have been working with cars for 10 years, specialized in diagnostics and troubleshooting. I created this blog because I was tired of finding false information on the web while looking for repair information. I hope you enjoy my content!