If you are alert of abnormal signs on your car, you are right to be concerned, because a car represents a huge annual budget and unforeseen malfunctions don’t reduce the costs. So what if you think that you have a leaking injector on your BMW X4? You likely figured it out thanks to black/oily drips along your engine unit, or a troubled idle, or abnormal black smoke. These three manifestations are the main indicators of a leaking injector. As this problem can bring about more significant engine concerns on your car, we decided to publish this article content to help you validate the failure of a leaking injector and handle it properly. To do this, we will initially take a look at the case of gasoline injectors and then at those of diesel injectors BMW X4.


Leaking injector on my petrol BMW X4

It is crucial to know that the injectors on petrol and diesel engines are different, in reality, the difference in combustion between these two sort of engines makes the injection different. 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 BMW X4: The different leaks

It should be noted that injector leaks on a BMW X4 equipped with a petrol engine are rather infrequent. This is caused by the much lower pressure in the petrol intake systems. However, there are two sort 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:
    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 previously.

Leaking injector on my diesel BMW X4

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 BMW X4: The different leaks

In the case of leaking diesel injectors on your BMW X4, there are three different sort of leaks:

  • Leakage from the injector inlet:
    In this instance, 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 X4 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 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 encourage you to consult this article content on the existence of oil leaking on your BMW X4.

Leaking injector on my BMW X4, how to fix the leak

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

  • Lower the pressure before any work is completed…
  • Covering 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 very often be limited to swapping the seals that have failed:

  • Situate 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 respect with the manufacturer’s standards.

In all cases, these interventions are not necessarily complex, but if you have the slightest doubt in the treatment of your injector that leaks on your BMW X4, we encourage you to get closer to your mechanic to avoid any bad handling that could critically harm the condition of your BMW X4.

If you have any further questions about the BMW X4, do not hesitate to consult our BMW X4 category.