In cases where you are alert of unusual signs on your vehicle, you are right to be worried, because a car represents a massive annual budget and unforeseen breakdowns don’t reduce the bill. So what if you sense that you have a leaking injector on your Subaru Impreza? You most likely figured it out thanks to black/oily drips along your engine, or a troubled idle, or unconventional black smoke. These three manifestations are the main signs of a leaking injector. As this failure can end up in 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 correctly. To do this, we will first look at the case of gasoline injectors and then at those of diesel injectors Subaru Impreza.
Leaking injector on my petrol Subaru Impreza
It is vital to know that the injectors on petrol and diesel engines are different, in reality, the difference in combustion between these two types of engines makes the injection different. The key 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 Subaru Impreza: The different leaks
It should be noted that injector leaks on a Subaru Impreza equipped with a petrol engine are rather infrequent. This is as a result of the much lower pressure in the petrol intake systems. Even so, there are two types 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 component that is attached to the fuel rail, an O-ring will be involved in this. - Leak injector of the lower part:
Finally, you may suffer 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 Subaru Impreza
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system generates 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 Subaru Impreza: The different leaks
In the case of leaking diesel injectors on your Subaru Impreza, there are three several types of leaks:
- Leakage from the injector inlet:
In cases like this, it is an inlet pipe that will deform over time, in most cases 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 Subaru Impreza 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 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 examining you have oil leaking but it does not come from your injectors, we advise you to consult this article on the existence of oil leaking on your Subaru Impreza.
Leaking injector on my Subaru Impreza, how to fix the leak
And finally, we’re going to look at how to fix a leaking injector on your car. Oftentimes a leak is connected, as we have seen sooner, to a worn seal due to the pressures suffered. But think that the pressure in the circuit is tremendous, specifically on diesel engines. So you will have to take some measures:
- Lower the pressure before any work is achieved…
- 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 very often be limited to changing the seals that have failed:
- Locate the source of the leak
- Dismantle the injector in question
- Replace 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 necessarily complex, but if you have the tiniest doubt in the treatment of your injector that leaks on your Subaru Impreza, we advise you to get closer to your motor mechanic to avoid any bad handling that could significantly harm the condition of your Subaru Impreza.
If perhaps you have any additional questions about the Subaru Impreza, do not hesitate to consult our Subaru Impreza category.
