You have found yourself once or twice stalling with your Audi A4 when you try to start the car and you have no clue why. Even if your car starts after several tests, it is important to look into the problem so as to solve the breakdown as soon as possible, when you want to avoid a more serious problem.
The objective of this article is to help you see things more visibly and try to understand what might cause trouble. We will talk about the various potential breakdowns you may encounter so that you can solve them easily and avoid more problems on your Audi A4.


Reasons for stalling at start-up

We will structure this article into two separate paragraphs, one dealing with mechanical causes, and the other with electronic causes.

1: Mechanical origins on your Audi A4 that makes you stall

In this section, we will see the different parts that could cause you to stall at start-up if they are broken.
The idle actuator: The role of the idle actuator is to control the air in the engine when it is idling so that it does not choke or stall. If you ever think that your engine is slightly browsing before stalling, it is very certain that the idle actuator is concerned.
Battery: If your car starts normally and then stalls a little later, it’s nothing to do with the battery. It will be concerned if your Audi A4 starts to stall immediately after switching it on.
In that case, check the battery carefully.
Also, simply look at your dashboard to get information thanks to the the lights that may be on.
Also, remember to manually check the cleanliness of the parts of your Audi A4. Indeed, a thorough cleaning of the parts (filters, injection pump, pressure regulator) could help you out of situations that would have seemed much more delicate, and avoid your Audi A4 to stall. This is often the cause of other various breakdowns.

2: Electronic origins on your Audi A4

We will take a look at here the potential electronic failures that could cause you problems, but in general the causes are very often, as we have mentioned, of mechanical origin.
BSM box: This is the information exchange platform of your Audi A4. It is improbable that this is the case because ithe BSM box is rather reliable. The majority of breakdowns related to this box are cars that stall while driving.
BSI box: The BSI box allows to centralize the information and to translate all these different languages for the global management of the vehicle functions. This could be the cause not if your Audi A4 stalls at start up, but if your Audi A4 does not start at all.
Calculator: This is the central element of a system called an “embedded system”. The primary function of an ECU is to deliver the right “weight” of fuel with each engine piston stroke. Several embedded systems electronically manage the various functions of the vehicle. There are between 30 and 80 on each car! Be careful with this part as some professionals tend to blame this part because they are incapable to find the exact failure. One defective sensor on your Audi A4 would be enough to put the blame on the ECU . Seek the advice of a second professional if you are ever asked to replace this part because it is expensive and not necessarily the cause for a Audi A4 to stall at start-up.

TDC sensor: Its part is to determine the speed at which your Audi A4 is operating so that the fuel is sent accordingly. It could be in poor condition, or simply dirty. Check its condition in order to draw conclusions and discover if this is the reason for your Audi A4 to stall at start-up.
Alternator: Logically, this one should be out of the question, because thanks to it the battery starts the car. Even so, it may be slightly damaged and the alternator may not be able to recharge the battery, which does not supply the car. It therefore manages to light up but goes out just as quickly.

3: Conclusion on your Audi A4

So here are the different parts that could affect your Audi A4 and make it stall at start-up. What you have to remember is that it is important to make sure that the parts are right and clean on your Audi A4. Then, do extensive research on each part if necessary to really understand their usefulness and diagnosis. Do not hesitate to call on the advice of several professionals so that you do not rely on just one person.

If you need more guides on the Audi A4, go to our Audi A4 category.