In the event that you are informed of abnormal symptoms on your automobile, you are right to be preoccupied, because a car represents a huge annual budget and unexpected malfunctions don’t lower the costs. So what if you find that you have a leaking injector on your Cadillac XTS? 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 signals of a leaking injector. As this problem can bring on more critical engine concerns on your car, we made a decision to produce this content page to help you verify the failure of a leaking injector and treat it correctly. To do this, we will first look at the case of gasoline injectors and then at those of diesel injectors Cadillac XTS.

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Leaking injector on my petrol Cadillac XTS

It is fundamental to know that the injectors on petrol and diesel engines are distinct, the reality is, the difference in combustion between these two types of engines makes the injection distinct. 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 Cadillac XTS: The different leaks

It should be noted that injector leaks on a Cadillac XTS equipped with a petrol engine are rather infrequent. This is resulting from the much lower pressure in the petrol intake systems. Even so, there are two types 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 portion 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 part 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 Cadillac XTS

Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system 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 Cadillac XTS: The different leaks

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

  • Leakage from the injector inlet:
    In this instance, it is an inlet pipe that will deform after a while, usually 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 Cadillac XTS 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 bothersome, it is the junction between the engine and the injector nose that leaks at a copper seal, you should experience an air noise and a compression loss.
  • If after examining you have oil leaking but it does not come from your injectors, we advise you to consult this content page on the existence of oil leaking on your Cadillac XTS.

Leaking injector on my Cadillac XTS, 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 caused by the pressures suffered. But think that the pressure in the circuit is tremendous, especially on diesel engines. So you will have to take some safety measures:

  • Lower the pressure before any work is achieved…
  • 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 regularly be restricted to swapping the seals that have failed:

  • Discover the source of the leak
  • Dismantle 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 very hard, but if you have the slightest doubt in the treatment of your injector that leaks on your Cadillac XTS, we advise you to get closer to your repair shop to avoid any bad manipulation that could severely harm the condition of your Cadillac XTS.

If you want more tutorials on the Cadillac XTS, go to our Cadillac XTS category.