It is hardly ever pleasant to listen to an injector noise on your Volvo S90. It is a noise that appears repeatedly, usually when you accelerate or your engine is idling. However, this sign may be linked to multiple types of problems with your vehicle injectors. It may not be anything major, but when a continuing noise comes out, you have to be sure. Most importantly since repairing your Volvo S90’s injectors can be expensive. That’s why our team chose to produce this content page in order to support you see more clearly, learn about the different possible failures and identify your trouble. To do this, we will first look at the normal running and usefulness of the injectors in your Volvo S90, then at the possible causes from which an injector noise may come.injector-noise-volvo-s90

Functions of the injectors

Injectors are a very useful component of the operation of your engine. They were brought in to the modern automobiles 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 accurately (quantity of fuel injected, air/fuel mixture) via the analysis of the data accumulated from the various sensors equipping the vehicle (engine temperature, acceleration level, engine speed, etc.). Their objective 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 Volvo S90

Experiencing injector noises on your Volvo S90 may result from different locations, we will now concentrate on the potential triggers of these. Generally, the regular noise of a faulty injector is of the snap type. Here are the several origins of these noises and the solutions to be applied to prevent them. If you listen to another clicking noise but it is not from your injectors, we advise you to examine this content page about clicking noise on Volvo S90 to locate the cause.

The causes for injector clicking or knocking noise Volvo S90

A clicking or knocking noise from your injectors can be explained for different causes. In fact, the injectors of your Volvo S90 have three main missions, to control the vaporisation of the fuel, i.e., to transform the liquid into “gas” during injection, to facilitate 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 tasks is altered, 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 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 Volvo S90. The main cause of these trouble in most cases comes from a particle that gets into the injectors. The precision of the injector being in the nanometer range, any possible blockage will inevitably cause a malfunction of the injector. If after checking, this noise comes from another component of the engine of your Volvo S90, browse this content page for more infos.

The end result of injector noise on Volvo S90

Now that we have analyzed the several causes for injector noise on your Volvo S90, we will end by stating the possible consequences 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 side effects which can quickly become major….
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 basic effects experienced by drivers is a significant loss of power. In fact, 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 quickly harm your cylinders or pistons and your engine may tighten.
Here are three little tips 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 changing your diesel fuel filter regularly>