It is never pleasant to listen to an injector noise on your Audi S4. It is a noise that happens regularly, usually when you accelerate or your engine is idling. However, this indicator may be linked to several types of concerns with your automobile injectors. It may not be anything major, but when a continuing noise shows up, you have to be sure. Specifically since fixing your Audi S4’s injectors can be costly. That’s why our team decided to compose this content in order to support you see more clearly, learn about the different plausible failures and distinguish your trouble. To do this, we will first look at the normal functioning and usefulness of the injectors in your Audi S4, then at the plausible causes from which an injector noise may come.
Attributes of the injectors
Injectors are a very useful part of the operation of your engine. They were launched to the modern vehicles 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 precisely (quantity of fuel injected, air/fuel mixture) via the analysis of the data obtained from the various sensors equipping the automobile (engine temperature, acceleration level, engine speed, etc.). Their aim is therefore to inject under high pressure a precise quantity of an air/fuel mixture at a perfect timing to get the best possible combustion in the cylinders.
The different origins of a clicking or knocking noise caused by the injectors of your Audi S4
Hearing injector noises on your Audi S4 may originate from different sources, we will now center on the potential triggers of these. In general, 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 put into practice to get rid of them. If you listen to another clicking noise but it is not from your injectors, we suggest you to read this content about clicking noise on Audi S4 to discover the cause.
The reasons for injector clicking or knocking noise Audi S4
A clicking or knocking noise from your injectors can be justified by different reasons. Indeed, the injectors of your Audi S4 have three main missions, to manage the vaporisation of the fuel, i.e., to transform the liquid into “gas” during injection, to ease its combustion. Then, its mission is to deal with the air/fuel dosage and finally the homogeneity of the mixture, always with the aim of improving combustion. If one of these three functions is altered, the main role of the injectors will be disrupted and this will lead to poor combustion. This bad combustion will be a violent explosion in the cylinders due to bad timing, or a bad quantity of mixture or finally an inhomogeneous mixture and will induce thoses knocking or clicking noises on your Audi S4. The main cause of these problems commonly originates from a particle that gets into the injectors. The accuracy of the injector being in the nanometer range, any possible obstruction will inevitably cause a malfunction of the injector. If after checking, this noise originates from another component of the engine of your Audi S4, read this content for more infos.
The repercussions of injector noise on Audi S4
Now that we have analyzed the several reasons for injector noise on your Audi S4, we will end by stating the possible end result of malfunctioning one or more of your injectors. Whether only one is obstructed, or broken, or your entire fuel rail is involved, you cannot escape these repercussions which can almost instantly become critical….
First, you risk destroying your exhaust unit 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 regular repercussions felt by drivers is a serious loss of power. Indeed, if your engine is running on 3 out of 4 cylinders for example, you will inevitably have a loss of power
Finally, you risk degrading 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 suggestions to limit the risks connected with 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 swapping your diesel fuel filter regularly>
