If you are informed of irregular signs on your automobile, you are right to be intrigued, because a car represents a massive annual budget and sudden malfunctions don’t reduce the bill. So what if you feel like you have a leaking injector on your Opel Mokka? You likely figured it out thanks to black/oily drips along your engine, or a troubled idle, or unconventional black smoke. These three symptoms are the main symptoms of a leaking injector. As this troubles can cause more serious engine trouble on your car, we chose to compose this content to help you confirm the failure of a leaking injector and handle it properly. To achieve this, we will first take a look at the case of gasoline injectors and then at those of diesel injectors Opel Mokka.


Leaking injector on my petrol Opel Mokka

It is important to know that the injectors on petrol and diesel engines are different, the reality is, the difference in combustion between these two sort of engines makes the injection different. The main difference lies in the pressure undergone 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 Opel Mokka: The different leaks

It should be said that injector leaks on a Opel Mokka equipped with a petrol engine are rather infrequent. This is as a result of 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 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:
    At last, you may experience a leak coming from the lower part of the injector of your car, this one will occur from the junction with the engine and not with the rail as seen before.

Leaking injector on my diesel Opel Mokka

Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure 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 Opel Mokka: The different leaks

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

  • Leakage from the injector inlet:
    In cases like this, it is an inlet pipe that will deform after a while, generally the leak will be at the clamping point.
  • Injector return leakage:
    As its name suggests, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Opel Mokka will be caused by an O-ring or its plastic tip that leaks.
  • Injector base leak:
    This injection leak is one of the most annoying, 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 read this content on the existence of oil leaking on your Opel Mokka.

Leaking injector on my Opel Mokka, 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 connected, as we have seen previously, to a worn seal caused by the pressures endured. But think that the pressure in the circuit is gigantic, specifically on diesel engines. So you will have to take some precautions:

  • 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 frequently be restricted to replacing the seals that have failed:

  • Identify the source of the leak
  • Take apart 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 cases, these interventions are not necessarily complicated, but if you have the smallest doubt in the treatment of your injector that leaks on your Opel Mokka, we advise you to get closer to your repair shop to avoid any bad manipulation that could seriously harm the condition of your Opel Mokka.

If you need more tutorials on the Opel Mokka, go to our Opel Mokka category.