In cases where you are aware of irregular signs on your car, you are right to be concerned, because a car represents a huge annual budget and unpredicted breakdowns don’t reduce the bill. So what if you feel like you have a leaking injector on your Toyota Yaris? You most likely figured it out thanks to black/oily drips along your engine unit, or a troubled idle, or uncommon black smoke. These three signs of illness are the main symptoms of a leaking injector. As this failure can bring about more serious engine complications on your car, we decided to compose this content page to help you ensure the failure of a leaking injector and handle it correctly. To achieve this, we will first take a look at the case of gasoline injectors and then at those of diesel injectors Toyota Yaris.

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Leaking injector on my petrol Toyota Yaris

It is essential to know that the injectors on petrol and diesel engines are distinct, the truth is, the difference in combustion between these two sort of engines makes the injection distinct. 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 Toyota Yaris: The different leaks

It should be known that injector leaks on a Toyota Yaris equipped with a petrol engine are pretty infrequent. This is caused by the much lower pressure in the petrol intake systems. Even so, there are two sort of leaks:

  • Leakage from the top of the injector:
    It is possible that you have a leak from the top of the injector, this is the part 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 part of the injector of your car, this one will come from the junction with the engine and not with the rail as seen sooner.

Leaking injector on my diesel Toyota Yaris

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 Toyota Yaris: The different leaks

In the case of leaking diesel injectors on your Toyota Yaris, there are three several sort of leaks:

  • Leakage from the injector inlet:
    In this case, it is an inlet pipe that will deform with time, generally the leak will be at the clamping point.
  • Injector return leakage:
    As its name implies, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Toyota Yaris will be the result 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 experience 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 Toyota Yaris.

Leaking injector on my Toyota Yaris, how to fix the leak

And at last, 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 as a result 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 conducted…
  • Masking 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 oftentimes be limited to swapping the seals that have failed:

  • Discover 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 situations, these interventions are not inevitably complex, but if you have the smallest doubt in the treatment of your injector that leaks on your Toyota Yaris, we suggest you to get closer to your repair shop to avoid any bad manipulation that could seriously harm the condition of your Toyota Yaris.

Whenever you have any additional questions about the Toyota Yaris, do not hesitate to consult our Toyota Yaris category.