Whenever you are alert of abnormal signs on your vehicle, you are right to be concerned, because a car represents a massive annual budget and surprising malfunctions don’t reduce the bill. So what if you think that you have a leaking injector on your Bmw Serie 3 E93? You most likely figured it out thanks to black/oily drips along your engine, or a troubled idle, or abnormal black smoke. These three symptoms are the main signals of a leaking injector. As this problem can produce more severe engine problems on your car, we thought we would produce this content to help you validate the failure of a leaking injector and deal with it correctly. To do so, we will first look into the case of gasoline injectors and then at those of diesel injectors Bmw Serie 3 E93.

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Leaking injector on my petrol Bmw Serie 3 E93

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 essential 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 Serie 3 E93: The different leaks

It should be mentioned that injector leaks on a Bmw Serie 3 E93 equipped with a petrol engine are pretty infrequent. This is due to 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 conceivable that you have a leak from the top of the injector, this is the component that is attached 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 Bmw Serie 3 E93

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 Serie 3 E93: The different leaks

In the case of leaking diesel injectors on your Bmw Serie 3 E93, there are three several kind 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 suggests, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Bmw Serie 3 E93 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 troublesome, 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 advise you to consult this content on the existence of oil leaking on your Bmw Serie 3 E93.

Leaking injector on my Bmw Serie 3 E93, how to fix the leak

And finally, we’re going to look into how to fix a leaking injector on your car. Very often 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 gigantic, especially on diesel engines. So you will have to take some safety measures:

  • 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 frequently be limited to changing the seals that have failed:

  • Find the source of the leak
  • Dismantle the injector in question
  • Replace 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 inevitably complex, but if you have the slightest doubt in the treatment of your injector that leaks on your Bmw Serie 3 E93, we advise you to get closer to your auto technician to avoid any bad handling that could severely harm the condition of your Bmw Serie 3 E93.

To find more tips on the Bmw Serie 3 E93, take a look at the Bmw Serie 3 E93 category.