In the event you are alert of irregular signs on your vehicle, you are right to be preoccupied, because a car represents a massive annual budget and unexpected breakdowns don’t lower the bill. So what if you feel like you have a leaking injector on your smart forfour? You probably figured it out thanks to black/oily drips along your engine motor, or a disturbed idle, or unconventional black smoke. These three symptoms are the main signs of a leaking injector. As this failure can bring on more serious engine concerns on your car, we decided to publish this article to help you ensure the failure of a leaking injector and deal with it properly. To achieve this, we will first check out the circumstance of gasoline injectors and then at those of diesel injectors smart forfour.

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Leaking injector on my petrol smart forfour

It is fundamental 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 smart forfour: The different leaks

It should be mentioned that injector leaks on a smart forfour equipped with a petrol engine are rather infrequent. This is caused by the much lower pressure in the petrol intake systems. Nevertheless, 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 component that is attached 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 previously.

Leaking injector on my diesel smart forfour

Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure creates 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 smart forfour: The different leaks

In the circumstance of leaking diesel injectors on your smart forfour, there are three several sort of leaks:

  • Leakage from the injector inlet:
    In this instance, it is an inlet pipe that will deform after a while, commonly 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 smart forfour 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 find an air noise and a compression loss.
  • If after verifying you have oil leaking but it does not come from your injectors, we encourage you to browse this article on the existence of oil leaking on your smart forfour.

Leaking injector on my smart forfour, how to fix the leak

And at last, we’re going to check out how to fix a leaking injector on your car. Frequently a leak is linked, as we have seen prior to this, to a worn seal due to the pressures suffered. 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 completed…
  • 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 replacing the seals that have failed:

  • Locate 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 cases, these interventions are not specifically difficult, but if you have the smallest uncertainty in the treatment of your injector that leaks on your smart forfour, we encourage you to get closer to your auto technician to avoid any bad manipulation that could severely harm the condition of your smart forfour.

In the event that you have any further questions about the smart forfour, do not hesitate to consult our smart forfour category.