If you are alert of abnormal signs on your automobile, you are right to be intrigued, because a car represents a huge annual budget and unforeseen breakdowns don’t lower the bill. So what if you find that you have a leaking injector on your Infiniti QX80? You most likely figured it out thanks to black/oily drips along your engine, or a troubled idle, or strange black smoke. These three manifestations are the main signs of a leaking injector. As this failure can end up in more severe engine complications on your car, we thought we would write this article to help you confirm the failure of a leaking injector and deal with it correctly. To accomplish this, we will first check out the case of gasoline injectors and then at those of diesel injectors Infiniti QX80.
Leaking injector on my petrol Infiniti QX80
It is fundamental to know that the injectors on petrol and diesel engines are different, actually, the difference in combustion between these two kind 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 Infiniti QX80: The different leaks
It should be said that injector leaks on a Infiniti QX80 equipped with a petrol engine are rather rare. This is caused by 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 possible that you have a leak from the top of the injector, this is the portion that is linked 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 occur from the junction with the engine and not with the rail as seen previously.
Leaking injector on my diesel Infiniti QX80
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure 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 Infiniti QX80: The different leaks
In the case of leaking diesel injectors on your Infiniti QX80, there are three several kind of leaks:
- Leakage from the injector inlet:
In cases like this, it is an inlet pipe that will deform in the long run, in most cases the leak will be at the clamping point. - Injector return leakage:
As its name suggests, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Infiniti QX80 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 experience an air noise and a compression loss. - If after checking you have oil leaking but it does not come from your injectors, we encourage you to consult this article on the existence of oil leaking on your Infiniti QX80.
Leaking injector on my Infiniti QX80, how to fix the leak
And finally, we’re going to check out how to fix a leaking injector on your car. Oftentimes a leak is connected, as we have seen previously, to a worn seal as a result of 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 completed…
- 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 very often be restricted to changing the seals that have failed:
- Locate 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 accordance with the manufacturer’s standards.
In all situations, these interventions are not inevitably complex, but if you have the tiniest hesitation in the treatment of your injector that leaks on your Infiniti QX80, we encourage you to get closer to your auto technician to avoid any bad manipulation that could critically harm the condition of your Infiniti QX80.
Whenever you have any further questions about the Infiniti QX80, do not hesitate to consult our Infiniti QX80 category.
