In the event that you are alert of unusual signs on your automobile, you are right to be intrigued, because a car represents a huge annual budget and unexpected malfunctions don’t lower the expenses. So what if you feel like you have a leaking injector on your Honda Civic? You probably figured it out thanks to black/oily drips along your engine unit, or a disturbed idle, or unconventional black smoke. These three symptoms are the main signals of a leaking injector. As this problem can cause more serious engine complications on your car, we chose to write this content page to help you confirm the failure of a leaking injector and treat it properly. To do so, we will first of all check out the case of gasoline injectors and then at those of diesel injectors Honda Civic.


Leaking injector on my petrol Honda Civic

It is vital to know that the injectors on petrol and diesel engines are different, in fact, the difference in combustion between these two kind 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 Honda Civic: The different leaks

It should be said that injector leaks on a Honda Civic equipped with a petrol engine are rather infrequent. This is resulting from the much lower pressure in the petrol intake systems. Nevertheless, 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 part 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 appear from the junction with the engine and not with the rail as seen before.

Leaking injector on my diesel Honda Civic

Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system 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 Honda Civic: The different leaks

In the case of leaking diesel injectors on your Honda Civic, there are three different kind of leaks:

  • Leakage from the injector inlet:
    In this case, it is an inlet pipe that will deform along with time, usually 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 Honda Civic 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 feel 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 presence of oil leaking on your Honda Civic.

Leaking injector on my Honda Civic, how to fix the leak

And at last, we’re going to check out how to fix a leaking injector on your car. Very often a leak is connected, as we have seen sooner, to a worn seal because of the pressures endured. But think that the pressure in the circuit is enormous, especially on diesel engines. So you will have to take some 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 replacing the seals that have failed:

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

In all cases, these interventions are not automatically complex, but if you have the smallest doubt in the treatment of your injector that leaks on your Honda Civic, we suggest you to get closer to your mechanic to avoid any bad manipulation that could significantly harm the condition of your Honda Civic.

Whenever you have any further questions about the Honda Civic, do not hesitate to consult our Honda Civic category.