It is rarely ever enjoyable to experience an injector noise on your BMW 3 Series. It is a noise that appears regularly, usually when you accelerate or your engine is idling. However, this indicator may be connected to different kind of concerns with your car injectors. It may not be anything severe, but when a repeated noise happens, you have to be sure. Especially since repairing your BMW 3 Series’s injectors can be costly. That’s why our team decided to prepare this article content in order to support you see more clearly, learn about the different conceivable failures and establish your trouble. To do this, we will first look at the normal functioning and usefulness of the injectors in your BMW 3 Series, then at the conceivable triggers from which an injector noise may come.injector-noise-bmw-3-series

Attributes of the injectors

Injectors are a very significant component of the operation of your engine unit. They were launched to the modern cars about 20 years ago. Before their arrival, 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 opportunity, 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 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 reasons of a clicking or knocking noise coming from the injectors of your BMW 3 Series

Listening injector noises on your BMW 3 Series may come from different locations, we will now concentrate on the potential triggers of these. Generally, the common noise of a faulty injector is of the snap type. Here are the several origins of these noises and the solutions to be adopted to stop them. If you experience another clicking noise but it is not from your injectors, we suggest you to go through this article content about clicking noise on BMW 3 Series to discover the trigger.

The causes for injector clicking or knocking noise BMW 3 Series

A clicking or knocking noise from your injectors can be justified by different causes. In fact, the injectors of your BMW 3 Series have three main missions, to control the vaporisation of the fuel, i.e., to convert the liquid into “gas” during injection, to ease its combustion. Then, its objective 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 features is modified, the main purpose 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 BMW 3 Series. The main trigger of these situations usually comes from a particle that gets into the injectors. The accuracy of the injector being in the nanometer range, any possible obstruction will inevitably lead to a malfunction of the injector. If after checking, this noise comes from another element of the engine of your BMW 3 Series, check this article content for more infos.

The effects of injector noise on BMW 3 Series

Now that we have reviewed the different causes for injector noise on your BMW 3 Series, we will end by stating the possible effects of malfunctioning one or more of your injectors. Whether only one is blocked, or damaged, or your entire fuel rail is involved, you cannot escape these side effects which can quickly become considerable….
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 common effects felt by drivers is a distinctive loss of power. In fact, if your engine is running on 3 out of 4 cylinders for example, you will obviously have a loss of power
Finally, you risk degrading one of your pistons or your engine. Poor combustion will quickly damage your cylinders or pistons and your engine may tighten.
Here are three little recommendations to limit the risks relating 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 swapping your diesel fuel filter regularly>