In cases where you are alert of unusual symptoms on your vehicle, you are right to be worried, because a car represents a huge annual budget and sudden breakdowns don’t reduce the expenses. So what if you feel like you have a leaking injector on your Audi Q7? You most likely figured it out thanks to black/oily drips along your engine, or a disturbed idle, or unconventional black smoke. These three signs of illness are the main symptoms of a leaking injector. As this troubles can lead to more critical engine complications on your car, we thought we would produce this article content to help you verify the failure of a leaking injector and treat it properly. To achieve this, we will first take a look at the case of gasoline injectors and then at those of diesel injectors Audi Q7.

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Leaking injector on my petrol Audi Q7

It is vital to know that the injectors on petrol and diesel engines are distinct, actually, the difference in combustion between these two types of engines makes the injection distinct. The key difference lies in the pressure undergone 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 Q7: The different leaks

It should be said that injector leaks on a Audi Q7 equipped with a petrol engine are pretty infrequent. This is because of 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 portion that is connected to the fuel rail, an O-ring will be involved in this.
  • Leak injector of the lower part:
    Finally, you may encounter a leak coming from the lower portion of the injector of your car, this one will appear from the junction with the engine and not with the rail as seen before.

Leaking injector on my diesel Audi Q7

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 Q7: The different leaks

In the case of leaking diesel injectors on your Audi Q7, there are three different types of leaks:

  • Leakage from the injector inlet:
    In cases like this, it is an inlet pipe that will deform in the long run, 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 Q7 will be a consequence 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 find an air noise and a compression loss.
  • If after checking you have oil leaking but it does not come from your injectors, we suggest you to browse this article content on the presence of oil leaking on your Audi Q7.

Leaking injector on my Audi Q7, how to fix the leak

And to finish, we’re going to take a look at how to fix a leaking injector on your car. Regularly a leak is connected, as we have seen prior to this, to a worn seal caused by the pressures suffered. But think that the pressure in the circuit is tremendous, specifically on diesel engines. So you will have to take some measures:

  • Lower the pressure before any work is done…
  • Masking 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 oftentimes be restricted to replacing the seals that have failed:

  • Situate the source of the leak
  • Take apart the injector in question
  • Replace 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 specifically difficult, but if you have the tiniest hesitation in the treatment of your injector that leaks on your Audi Q7, we suggest you to get closer to your repair shop to avoid any bad handling that could severely harm the condition of your Audi Q7.

Whenever you have any additional questions about the Audi Q7, do not hesitate to consult our Audi Q7 category.