In the event that you are aware of unusual signs on your car, you are right to be concerned, because a car represents a massive annual budget and unpredicted malfunctions don’t lower the expenses. So what if you sense that you have a leaking injector on your Scion tC? You probably figured it out thanks to black/oily drips along your engine, or a disturbed idle, or uncommon black smoke. These three signs of illness are the main symptoms of a leaking injector. As this failure can end up in more serious engine trouble on your car, we decided to produce this article content to help you validate the failure of a leaking injector and handle it properly. To do so, we will first of all take a look at the circumstance of gasoline injectors and then at those of diesel injectors Scion tC.

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Leaking injector on my petrol Scion tC

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 biggest 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 Scion tC: The different leaks

It should be known that injector leaks on a Scion tC equipped with a petrol engine are rather rare. This is as a result of 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 conceivable that you have a leak from the top of the injector, this is the part 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 suffer a leak coming from the lower portion 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 Scion tC

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 Scion tC: The different leaks

In the circumstance of leaking diesel injectors on your Scion tC, there are three different sort of leaks:

  • Leakage from the injector inlet:
    In this case, it is an inlet pipe that will deform after a while, usually 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 Scion tC 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 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 advise you to read this article content on the presence of oil leaking on your Scion tC.

Leaking injector on my Scion tC, 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. Frequently a leak is associated, as we have seen sooner, to a worn seal due to the pressures suffered. But think that the pressure in the circuit is gigantic, specifically on diesel engines. So you will have to take some measures:

  • Lower the pressure before any work is done…
  • Covering you to avoid the risk of fuel spillage
  • NEVER work on a running diesel engine injector.

Relating to the repair part of your leak, it will regularly be limited to swapping 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 necessarily very hard, but if you have the smallest uncertainty in the treatment of your injector that leaks on your Scion tC, we advise you to get closer to your auto mechanic to avoid any bad handling that could seriously harm the condition of your Scion tC.

If you wish more tutorials on the Scion tC, go to our Scion tC category.