In the event that you are informed of unusual symptoms on your car, you are right to be preoccupied, because a car represents a massive annual budget and unpredicted malfunctions don’t reduce the expenses. So what if you feel as if you have a leaking injector on your Alfa Romeo 159? You most likely figured it out thanks to black/oily drips along your engine, or a troubled idle, or unusual black smoke. These three manifestations are the main signs of a leaking injector. As this failure can bring about more severe engine problems on your car, we thought we would compose this content page to help you verify the failure of a leaking injector and deal with it properly. To achieve this, we will first of all look at the circumstance of gasoline injectors and then at those of diesel injectors Alfa Romeo 159.

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Leaking injector on my petrol Alfa Romeo 159

It is important to know that the injectors on petrol and diesel engines are different, the truth is, the difference in combustion between these two types of engines makes the injection different. The main 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 Alfa Romeo 159: The different leaks

It should be said that injector leaks on a Alfa Romeo 159 equipped with a petrol engine are pretty rare. This is because of 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 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:
    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 sooner.

Leaking injector on my diesel Alfa Romeo 159

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 Alfa Romeo 159: The different leaks

In the circumstance of leaking diesel injectors on your Alfa Romeo 159, there are three several types of leaks:

  • Leakage from the injector inlet:
    In this case, it is an inlet pipe that will deform as time passes, in most cases 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 Alfa Romeo 159 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 checking you have oil leaking but it does not come from your injectors, we suggest you to consult this content page on the existence of oil leaking on your Alfa Romeo 159.

Leaking injector on my Alfa Romeo 159, how to fix the leak

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

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

  • Discover 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 accordance with the manufacturer’s standards.

In all cases, these interventions are not specifically complex, but if you have the smallest doubt in the treatment of your injector that leaks on your Alfa Romeo 159, we suggest you to get closer to your auto mechanic to avoid any bad handling that could critically harm the condition of your Alfa Romeo 159.

If perhaps you have any further questions about the Alfa Romeo 159, do not hesitate to consult our Alfa Romeo 159 category.