In the event you are aware of abnormal symptoms on your vehicle, you are right to be intrigued, because a car represents a huge annual budget and unpredicted breakdowns don’t reduce the bill. So what if you sense that you have a leaking injector on your Audi A7? You likely figured it out thanks to black/oily drips along your engine motor, or a disturbed idle, or unusual black smoke. These three symptoms are the main symptoms of a leaking injector. As this troubles can cause more critical engine concerns on your car, we made a decision to compose this content to help you validate the failure of a leaking injector and treat it correctly. To achieve this, we will initially look into the case of gasoline injectors and then at those of diesel injectors Audi A7.
Leaking injector on my petrol Audi A7
It is vital to know that the injectors on petrol and diesel engines are different, the truth is, the difference in combustion between these two kind of engines makes the injection different. The key 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 A7: The different leaks
It should be mentioned that injector leaks on a Audi A7 equipped with a petrol engine are pretty infrequent. This is due to the much lower pressure in the petrol intake systems. Even so, there are two kind of leaks:
- Leakage from the top of the injector:
It is conceivable that you have a leak from the top of the injector, this is the portion that is linked 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 come from the junction with the engine and not with the rail as seen before.
Leaking injector on my diesel Audi A7
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure 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 A7: The different leaks
In the case of leaking diesel injectors on your Audi A7, there are three different kind of leaks:
- Leakage from the injector inlet:
In this instance, it is an inlet pipe that will deform in the long run, commonly the leak will be at the clamping point. - Injector return leakage:
As its name reveals, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Audi A7 will be caused by an O-ring or its plastic tip that leaks. - Injector base leak:
This injection leak is one of the most troublesome, 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 recommend you to browse this content on the existence of oil leaking on your Audi A7.
Leaking injector on my Audi A7, how to fix the leak
And finally, we’re going to look into how to fix a leaking injector on your car. Frequently a leak is associated, as we have seen previously, to a worn seal as a result of the pressures suffered. But think that the pressure in the circuit is monumental, especially 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.
Concerning the repair part of your leak, it will frequently be restricted to replacing the seals that have failed:
- Find out the source of the leak
- Take apart the injector in question
- Replace the corresponding seal kit
- Reassemble the set up and tighten with a torque wrench in accordance with the manufacturer’s standards.
In all situations, these interventions are not specifically very hard, but if you have the smallest uncertainty in the treatment of your injector that leaks on your Audi A7, we recommend you to get closer to your auto technician to avoid any bad manipulation that could critically harm the condition of your Audi A7.
If you want more guides on the Audi A7, go to our Audi A7 category.
