It is never relaxing to hear an injector noise on your Audi A4. It is a noise that appears continually, usually when you accelerate or your engine is idling. However, this sign may be relating to several types of complications with your car injectors. It may not be anything serious, but when a persistent noise arises, you have to be sure. Especially since repairing your Audi A4’s injectors can be costly. That’s why our team decided to write this article in order to help you see more clearly, learn about the different conceivable failures and establish your issue. To do this, we will first look at the normal functioning and usefulness of the injectors in your Audi A4, then at the conceivable reasons from which an injector noise may come.injector-noise-audi-a4

Benefits of the injectors

Injectors are a very useful component of the operation of your engine unit. They were brought in to the modern cars about 20 years ago. Before their appearance, more conventional carburettor-type intake systems were employed, which handled the intake of air and fuel into the engine cylinders. With the injectors, manufacturers now have the ability, thanks to the injectors pump, to control electronically each stage of the intake process very accurately (quantity of fuel injected, air/fuel mixture) via the analysis of the data accumulated from the various sensors equipping the car (engine temperature, acceleration level, engine speed, etc.). Their goal is therefore to inject under high pressure a precise quantity of an air/fuel mixture at a perfect timing to obtain the best possible combustion in the cylinders.

The different causes of a clicking or knocking noise based on the injectors of your Audi A4

Finding out injector noises on your Audi A4 may result from different sources, we will now center on the potential causes of these. Generally, the regular noise of a faulty injector is of the snap type. Here are the several sources of these noises and the solutions to be used to eliminate them. If you hear another clicking noise but it is not from your injectors, we advise you to read this article about clicking noise on Audi A4 to find the cause.

The explanations for injector clicking or knocking noise Audi A4

A clicking or knocking noise from your injectors can be explained for different explanations. In fact, the injectors of your Audi A4 have three main tasks, to control the vaporisation of the fuel, i.e., to transform the liquid into “gas” during injection, to ease its combustion. Then, its objective is to deal with the air/fuel dosage and at last the homogeneity of the mixture, always with the target of improving combustion. If one of these three features is modified, the main functionality of the injectors will be disturbed and this will lead to poor combustion. This bad combustion will be a violent explosion in the cylinders resulting from bad timing, or a bad quantity of mixture or finally an inhomogeneous mixture and will induce thoses knocking or clicking noises on your Audi A4. The main cause of these concerns commonly originates from a particle that gets into the injectors. The precision of the injector being in the nanometer range, any possible blockage will inevitably produce a malfunction of the injector. If after checking, this noise originates from another component of the engine of your Audi A4, read this article for more informations.

The repercussions of injector noise on Audi A4

Now that we have reviewed the diverse reasons for injector noise on your Audi A4, we will end by stating the possible end result of malfunctioning one or more of your injectors. Whether only one is obstructed, or damaged, or your entire fuel rail is involved, you cannot escape these repercussions which can almost instantly become severe….
First, you risk destroying your exhaust system in the long run, because the unburned fuel residues that will end up in your exhaust system can corrode the metal in it.
One of the most basic consequences felt by drivers is a noticeable loss of power. In fact, if your engine is running on 3 out of 4 cylinders for example, you will surely have a loss of power
Finally, you risk deteriorating one of your pistons or your engine. Poor combustion will almost instantly damage your cylinders or pistons and your engine may tighten.
Here are three little recommendations to limit the risks linked to your injectors and protect you from engine failure:

  • Do not drive at the bottom of the tank, as you may absorb impurities
  • Use quality fuel
  • Think of changing your diesel fuel filter regularly>