In cases where you are alert of abnormal symptoms on your automobile, you are right to be worried, because a car represents a huge annual budget and unpredicted malfunctions don’t lower the costs. So what if you feel as if you have a leaking injector on your Audi S5? You almost certainly figured it out thanks to black/oily drips along your engine motor, or a disturbed idle, or unusual black smoke. These three signs of illness are the main signs of a leaking injector. As this failure can produce more significant engine concerns on your car, we decided to prepare this article to help you verify the failure of a leaking injector and deal with it correctly. To achieve this, we will initially check out the circumstance of gasoline injectors and then at those of diesel injectors Audi S5.
Leaking injector on my petrol Audi S5
It is vital to know that the injectors on petrol and diesel engines are distinct, the truth is, the difference in combustion between these two sort 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 S5: The different leaks
It should be mentioned that injector leaks on a Audi S5 equipped with a petrol engine are rather infrequent. This is caused by the much lower pressure in the petrol intake systems. However, there are two sort of leaks:
- Leakage from the top of the injector:
It is plausible that you have a leak from the top of the injector, this is the part that is connected to the fuel rail, an O-ring will be involved in this. - Leak injector of the lower part:
At last, you may encounter a leak coming from the lower portion of the injector of your car, this one will come from the junction with the engine and not with the rail as seen before.
Leaking injector on my diesel Audi S5
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system creates 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 S5: The different leaks
In the circumstance of leaking diesel injectors on your Audi S5, there are three several sort of leaks:
- Leakage from the injector inlet:
In this instance, it is an inlet pipe that will deform as time passes, generally the leak will be at the clamping point. - Injector return leakage:
As its name indicates, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Audi S5 will be caused by 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 encounter an air noise and a compression loss. - If after verifying you have oil leaking but it does not come from your injectors, we suggest you to read this article on the presence of oil leaking on your Audi S5.
Leaking injector on my Audi S5, how to fix the leak
And to finish, we’re going to check out how to fix a leaking injector on your car. Very often a leak is connected, as we have seen sooner, to a worn seal as a result of the pressures endured. But think that the pressure in the circuit is tremendous, especially on diesel engines. So you will have to take some precautions:
- Lower the pressure before any work is conducted…
- Masking 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 very often be restricted to swapping the seals that have failed:
- Find 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 cases, these interventions are not necessarily complex, but if you have the slightest hesitation in the treatment of your injector that leaks on your Audi S5, we suggest you to get closer to your auto technician to avoid any bad handling that could significantly harm the condition of your Audi S5.
If you want more guides on the Audi S5, go to our Audi S5 category.
