An injection system failure – but what exactly? See what it means for your car

A fuel injection system failure is a serious problem that can significantly affect the way your car works. The symptoms may vary – from difficulty starting the engine, through rough running, all the way to a drop in power. Find out how to recognise these symptoms and how to react to them, so as to avoid costly repairs and further problems.

Table of contents / Headings

• Why is the fuel injection system so important for the engine?
• What does an injection system failure mean?
• What are the symptoms of a fuel injection system failure?
• What leads to an injection system failure? A few common causes
• Can you drive with a damaged injection system?
• What are the costs of repairing an injection failure?
• How do you prevent fuel injection problems?

Why is the fuel injection system so important for the engine?

The fuel injection system is one of the most important systems in a modern engine, playing a key role in its effectiveness and efficiency. This system is responsible for the precise metering of the fuel that is delivered to the engine's cylinders. Thanks to this it is possible to achieve the optimal air-fuel mixture, which in turn translates into combustion efficiency, engine power and its economy. An injection system failure can lead to many problems, such as rough engine running, increased fuel consumption and the emission of harmful substances into the atmosphere.

The injection system has to work flawlessly in order to ensure even and accurate delivery of fuel at the right moment, which is essential for the engine to work properly

What does an injection system failure mean?

An injection system failure is a state in which the system responsible for delivering fuel to the engine isn't working properly. This may be caused by various problems, such as contaminants in the fuel, mechanical damage, electronic problems or incorrect fuel pressure.

The injection system failure warning light on the dashboard is the first signal that something is wrong. When this light comes on, it means that the on-board computer has detected a problem with the injection system and diagnosis is necessary. It's worth bearing in mind that an injection system failure can lead to a drop in engine power, rough running, and even to the vehicle being completely immobilised, if the problem isn't resolved quickly.

What are the symptoms of a fuel injection system failure?

One of the first symptoms of a fuel injection system failure is rough engine running, which I mentioned above. You may feel vibrations, especially at idle, and also notice drops in power during acceleration. Another symptom is difficulty starting the engine, especially from cold. If you notice that the unit cranks for longer than usual or requires several attempts, that may indicate a problem with the injection.

Another symptom is increased fuel consumption. When the injection system isn't working properly, the engine may burn more fuel than normal, which directly translates into more frequent visits to the petrol station. In addition you may notice smoke from the exhaust, which often indicates improper combustion of the fuel. In extreme cases an injection system failure may make it impossible to start the engine.

What leads to an injection system failure? A few common causes

Problems with fuel injection can have various causes, and the most common of these are contaminants in the fuel system, wear or damage to the injectors and problems with the fuel pump. Deposits may come from low-quality fuel containing fine particles that can block the injectors. Problems with the fuel pump, such as drops in pressure, can also disturb the correct metering of fuel to the engine, which manifests itself in reduced power and efficiency.

Can you drive with a damaged injection system?

Driving with a damaged injection system is not recommended, because it can lead to more serious damage to the engine and other components. Fuel injection is crucial for the correct combustion of fuel, and its failure can cause the engine to work incorrectly, increase exhaust emissions and increase fuel consumption. The symptoms of an injection system failure should prompt an immediate visit to a mechanic. Ignoring these signals can lead to costly repairs.

What are the costs of repairing an injection failure?

The cost of repairing a fuel injection system failure can vary considerably depending on the type of problem and the car model. Replacing a single injector can cost from a hundred or so to even a couple of thousand euros, depending on the make and model of the vehicle. If it's necessary to replace all the injectors or the fuel pump, the costs may be even higher. On top of that, the labour itself costs something too.

It's important to service the fuel injection system regularly and to use appropriate cleaning products, in order to minimise the risk of failure and the costs associated with it.

How do you prevent fuel injection problems?

To avoid problems with fuel injection, regular maintenance of the fuel system is crucial. Using high-quality fuel and regularly changing the fuel filters can considerably extend the service life of the injectors.

Furthermore, using specialist products such as TEC 2000 Diesel Injector Cleaner and TEC 2000 Fuel Injector Cleaner helps keep the injectors clean and fully serviceable. DIC removes contaminants and deposits from the injectors of diesel engines, improving combustion and reducing exhaust emissions.

Fuel Injector Cleaner, in turn, works similarly in petrol engines, restoring correct fuel atomisation and increasing engine power. Regular use of these products is an investment in the longevity and reliability of the fuel injection system.