6+ Causes of Misfiring Engine in Hybrid Cars

6+ Causes of Misfiring Engine in Hybrid Cars – The engine in a hybrid car is no different from a pure ICE gasoline engine. This is why engine misfiring can also occur in any type of hybrid car. In this article, I try to briefly discuss the problem of misfiring in hybrid cars.

There are many reasons why your hybrid car’s engine might be misfired. It could be a sensor that can cause the engine to jam or there could be other causes. It is important for you or a mechanic to diagnose and repair as soon as possible to prevent damage to other components.

Read more: How to Use DC Fast Charging for Hybrid and EV?

6+ Causes of Misfiring Engine in Hybrid Cars

Well, let’s say your hybrid car has an engine misfire. The question is: Why did the problem occur? Unfortunately, there are many potential causes that lie in a machine. So answering the question is not always easy. If your car is misfired, I personally recommend contacting a professional. But if you are a hobbyist, maybe this problem can be solved in your own hands.

Causes of Misfiring Engine in Hybrid Cars
Honda Civic hybrid engine. Image source: Honda Newsroom

Below is a list of issues that might be causing your hybrid engine to have misfiring issues;

  1. Faults in the ignition system.
  2. Air and fuel delivery disrupted.
  3. Engine emission problem.
  4. Compression Leak.
  5. Sensors and modules are having problems.
  6. Constraints on the control circuit.

I will briefly try to explain the Causes of Misfiring engine in Hybrid Cars above as follows. If there are other additions, please write a comment to complete this article.

Faults in the ignition system

Causes of Misfiring Engine in Hybrid Cars
Image source: Researgate

If a car with a pure ICE engine is familiar with the term misfiring, then this can also happen to your hybrid vehicle. Misfiring problems with ICE machines have many causes. Most people would think of worn spark plugs causing this problem. The problem is that spark plugs are only one of many sources of trouble.

Spark plugs are an important part of the ignition system. A typical modern ignition system contains a variety of components, including a control module, crankshaft position sensor, coil pack, wires, and, of course, spark plugs. Problems with any of these parts can cause engine misfiring.

Air and fuel delivery disrupted

As the problem with gasoline ICE engines in general, the engine in a hybrid vehicle also recognizes a mixture of fuel and air. Air and fuel mix together in the combustion chamber, then a spark plug ignites the mixture.

The combustion of fuel and air in the combustion chamber causes a large explosion. The explosion makes the engine move, creating the rotational force that the engine needs to propel the car. Any problem that bleeds the air/fuel mixture – from a faulty fuel injector to a vacuum leak – can cause a misfire.

Therefore, if your hybrid car misfires, you need to check the parts in the fuel delivery system. Usually, a clogged or dirty injector is one of the most common. But a faulty fuel pump and a dirty fuel filter are also one of the other things that cause misfiring.

Engine emission problem

The latest model cars have a range of emission equipment that helps minimize the amount of pollution released into the air. This is indeed part of the main purpose of the birth of a hybrid car. From the range of technologies for modern car emissions, we can take a few examples including exhaust gas recirculation (EGR) systems and positive crankcase ventilation (PCV) systems.

In some cases, a problem with the emission equipment can alter the engine’s air/fuel mixture enough to cause the engine to misfire. For PCV systems, this may not be too much of a problem. But it is very different from the EGR system.

EGR is a system that allows exhaust gases from combustion to re-enter the combustion chamber. In this system, there are sensors that are connected to the hybrid control unit (HCU). The HCU then processes the data to adjust the air and fuel intake in the engine regarding the presence of air from the combustion chamber. Well, if the sensor or EGR system has problems, usually the engine will experience misfiring.

Compression Leak

The problem that can cause the next misfire is a compression leak. Where does the compression leak in the ICE engine of a hybrid vehicle come from?

The answer to that question is actually the same as the answer for a pure internal combustion engine. Usually, the problem comes from the valve is not tight, the cylinder head gasket being damaged, wear on the piston, piston ring, and or cylinder. In cases like this, it means the problem is very serious and an engine overhaul is one of the best ways to solve it.

Sensors and modules are having problems

Vehicles today have a lot of sensors, especially in cars on hybrid cars. These sensors will lead to the HCU and then determine the work of the actuator on the engine.

Misfiring problems can stem from sensor problems. Call it the CKP and CMP sensor problems. These two sensors determine the amount of fuel and when ignition takes place. If one or both of these sensors is faulty, then clearly one of the problems is misfiring. However, it is not only the two sensors that can cause misfiring. Sensors like MAP sensor, MAF sensor, IAT sensor, and other sensors can also cause this problem.

Constraints on the control circuit

All input and output engine management devices (i.e., sensors, ignition coil packs, etc.) are connected if there is a good electrical line. Problems in this circuit, such as damaged wires or loose connections, can cause the machine to jam.

Therefore, sometimes just a trivial thing can cause misfiring on your machine. Please check the electrical parts that may be loose or dirty. Repair and clean and see if your hybrid car engine is still misfiring or not.

1 thought on “6+ Causes of Misfiring Engine in Hybrid Cars

  1. Pingback: Honda Jazz Hybrid Problems and How to Fix Them | Hi-tech for Future

Leave a Reply

Your email address will not be published.