Whenever you are informed of irregular symptoms on your car, you are right to be concerned, because a car represents a big annual budget and unexpected malfunctions don’t lower the bill. So what if you sense that you have a leaking injector on your BMW 2 Series? You probably figured it out thanks to black/oily drips along your engine unit, or a disturbed idle, or uncommon black smoke. These three symptoms are the main indicators of a leaking injector. As this troubles can bring about more significant engine concerns on your car, we thought we would write this article content to help you verify the failure of a leaking injector and treat it correctly. To achieve this, we will initially take a look at the circumstance of gasoline injectors and then at those of diesel injectors BMW 2 Series.

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Leaking injector on my petrol BMW 2 Series

It is essential to know that the injectors on petrol and diesel engines are distinct, actually, the difference in combustion between these two kind of engines makes the injection distinct. 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 BMW 2 Series: The different leaks

It should be said that injector leaks on a BMW 2 Series equipped with a petrol engine are pretty infrequent. This is because of 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 plausible that you have a leak from the top of the injector, this is the portion that is attached 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 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 BMW 2 Series

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 BMW 2 Series: The different leaks

In the circumstance of leaking diesel injectors on your BMW 2 Series, there are three different kind of leaks:

  • Leakage from the injector inlet:
    In cases like this, it is an inlet pipe that will deform as time passes, generally 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 BMW 2 Series will be brought on by 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 feel an air noise and a compression loss.
  • If after checking you have oil leaking but it does not come from your injectors, we recommend you to consult this article content on the presence of oil leaking on your BMW 2 Series.

Leaking injector on my BMW 2 Series, 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. Oftentimes a leak is associated, as we have seen prior to this, to a worn seal as a result of the pressures endured. But think that the pressure in the circuit is enormous, specifically on diesel engines. So you will have to take some safety measures:

  • Lower the pressure before any work is carried out…
  • Covering you to avoid the risk of fuel spillage
  • NEVER work on a running diesel engine injector.

Regarding the repair part of your leak, it will frequently be restricted to changing the seals that have failed:

  • Identify the source of the leak
  • Dismantle the injector in question
  • Change the corresponding seal kit
  • Reassemble the set up and tighten with a torque wrench in respect with the manufacturer’s standards.

In all situations, these interventions are not inevitably complex, but if you have the slightest hesitation in the treatment of your injector that leaks on your BMW 2 Series, we recommend you to get closer to your repair shop to avoid any bad manipulation that could significantly harm the condition of your BMW 2 Series.

If you wish more tutorials on the BMW 2 Series, go to our BMW 2 Series category.