In cases where you are informed of unusual signs on your automobile, you are right to be intrigued, because a car represents a big annual budget and surprising malfunctions don’t reduce the bill. So what if you think that you have a leaking injector on your Audi S3? You most likely figured it out thanks to black/oily drips along your engine motor, or a troubled idle, or unconventional black smoke. These three manifestations are the main signs of a leaking injector. As this failure can bring about more significant engine problems on your car, we decided to prepare this article content to help you validate the failure of a leaking injector and deal with it correctly. To accomplish this, we will initially look at the circumstance of gasoline injectors and then at those of diesel injectors Audi S3.
Leaking injector on my petrol Audi S3
It is fundamental to know that the injectors on petrol and diesel engines are distinct, in fact, the difference in combustion between these two types of engines makes the injection distinct. The biggest difference lies in the pressure experienced by the injectors, on a petrol engine it will vary between 3.5 bars for indirect injection and 120 bars for indirect injection.
Leaking injector on a petrol Audi S3: The different leaks
It should be noted that injector leaks on a Audi S3 equipped with a petrol engine are pretty rare. This is due to the much lower pressure in the petrol intake systems. However, there are two types of leaks:
- Leakage from the top of the injector:
It is possible that you have a leak from the top of the injector, this is the component that is connected to the fuel rail, an O-ring will be involved in this. - Leak injector of the lower part:
Finally, you may suffer a leak coming from the lower portion of the injector of your car, this one will occur from the junction with the engine and not with the rail as seen sooner.
Leaking injector on my diesel Audi S3
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system generates very high pressure in the engine, as do the injectors. On these models, the pressure is more than 10 times higher than on the direct injection of car petrol engines, reaching 1800 to 2000 bars.
Leaking injector on diesel Audi S3: The different leaks
In the circumstance of leaking diesel injectors on your Audi S3, there are three different types of leaks:
- Leakage from the injector inlet:
In this case, it is an inlet pipe that will deform along with time, in most cases the leak will be at the clamping point. - Injector return leakage:
As its name implies, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Audi S3 will be the result of an O-ring or its plastic tip that leaks. - Injector base leak:
This injection leak is one of the most annoying, it is the junction between the engine and the injector nose that leaks at a copper seal, you should feel an air noise and a compression loss. - If after verifying you have oil leaking but it does not come from your injectors, we recommend you to consult this article content on the existence of oil leaking on your Audi S3.
Leaking injector on my Audi S3, how to fix the leak
And at last, we’re going to look at how to fix a leaking injector on your car. Regularly a leak is linked, as we have seen prior to this, to a worn seal as a result of the pressures suffered. But think that the pressure in the circuit is monumental, specifically on diesel engines. So you will have to take some measures:
- Lower the pressure before any work is done…
- Covering you to avoid the risk of fuel spillage
- NEVER work on a running diesel engine injector.
Relating to the repair part of your leak, it will frequently be restricted to changing the seals that have failed:
- Identify the source of the leak
- Take apart the injector in question
- Change the corresponding seal kit
- Reassemble the assembly and tighten with a torque wrench in respect with the manufacturer’s standards.
In all situations, these interventions are not necessarily complex, but if you have the tiniest doubt in the treatment of your injector that leaks on your Audi S3, we recommend you to get closer to your mechanic to avoid any bad handling that could significantly harm the condition of your Audi S3.
To discover more tips on the Audi S3, take a look at the Audi S3 category.
