In cases where you are aware of abnormal signs on your vehicle, you are right to be worried, because a car represents a massive annual budget and unpredicted breakdowns don’t lower the bill. So what if you sense that you have a leaking injector on your Porsche Cayenne? You almost certainly 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 indicators of a leaking injector. As this failure can cause more significant engine trouble on your car, we thought we would prepare this content to help you confirm the failure of a leaking injector and deal with it correctly. To accomplish this, we will initially take a look at the case of gasoline injectors and then at those of diesel injectors Porsche Cayenne.
Leaking injector on my petrol Porsche Cayenne
It is essential 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 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 Porsche Cayenne: The different leaks
It should be said that injector leaks on a Porsche Cayenne equipped with a petrol engine are pretty infrequent. This is because of the much lower pressure in the petrol intake systems. However, there are two kind 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 connected 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 portion of the injector of your car, this one will come from the junction with the engine and not with the rail as seen previously.
Leaking injector on my diesel Porsche Cayenne
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure 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 Porsche Cayenne: The different leaks
In the case of leaking diesel injectors on your Porsche Cayenne, there are three different kind of leaks:
- Leakage from the injector inlet:
In cases like this, it is an inlet pipe that will deform along with time, 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 Porsche Cayenne 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 checking you have oil leaking but it does not come from your injectors, we recommend you to consult this content on the existence of oil leaking on your Porsche Cayenne.
Leaking injector on my Porsche Cayenne, how to fix the leak
And finally, we’re going to take a look at how to fix a leaking injector on your car. Regularly a leak is connected, as we have seen prior to this, to a worn seal caused by 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 conducted…
- 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 very often be limited to changing the seals that have failed:
- Locate the source of the leak
- Take apart the injector in question
- Change the corresponding seal kit
- Reassemble the assembly and tighten with a torque wrench in accordance with the manufacturer’s standards.
In all cases, these interventions are not necessarily complex, but if you have the smallest hesitation in the treatment of your injector that leaks on your Porsche Cayenne, we recommend you to get closer to your auto technician to avoid any bad manipulation that could critically harm the condition of your Porsche Cayenne.
If you wish more guides on the Porsche Cayenne, go to our Porsche Cayenne category.
