In the event that you are informed of unusual symptoms on your vehicle, you are right to be preoccupied, because a car represents a huge annual budget and sudden breakdowns don’t lower the costs. So what if you sense that you have a leaking injector on your Volkswagen CC? You most likely figured it out thanks to black/oily drips along your engine unit, or a disturbed idle, or abnormal black smoke. These three manifestations are the main symptoms of a leaking injector. As this troubles can end up in more significant engine trouble on your car, we decided to write this article to help you ensure the failure of a leaking injector and treat it correctly. To do this, we will first of all look at the case of gasoline injectors and then at those of diesel injectors Volkswagen CC.

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Leaking injector on my petrol Volkswagen CC

It is fundamental 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 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 Volkswagen CC: The different leaks

It should be mentioned that injector leaks on a Volkswagen CC equipped with a petrol engine are pretty infrequent. This is resulting from the much lower pressure in the petrol intake systems. However, there are two kind 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 part that is connected to the fuel rail, an O-ring will be involved in this.
  • Leak injector of the lower part:
    Finally, you may experience 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 sooner.

Leaking injector on my diesel Volkswagen CC

Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure produces 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 Volkswagen CC: The different leaks

In the case of leaking diesel injectors on your Volkswagen CC, there are three different kind of leaks:

  • Leakage from the injector inlet:
    In this case, 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 reveals, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Volkswagen CC 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 encounter an air noise and a compression loss.
  • If after examining you have oil leaking but it does not come from your injectors, we encourage you to browse this article on the existence of oil leaking on your Volkswagen CC.

Leaking injector on my Volkswagen CC, how to fix the leak

And finally, we’re going to look at how to fix a leaking injector on your car. Very often a leak is linked, as we have seen previously, to a worn seal caused by the pressures endured. But think that the pressure in the circuit is monumental, 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.

Concerning the repair part of your leak, it will regularly be limited to changing the seals that have failed:

  • Discover the source of the leak
  • Take apart the injector in question
  • Change 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 automatically complex, but if you have the slightest doubt in the treatment of your injector that leaks on your Volkswagen CC, we encourage you to get closer to your repair shop to avoid any bad handling that could seriously harm the condition of your Volkswagen CC.

To discover more tips on the Volkswagen CC, take a look at the Volkswagen CC category.