In the event you are informed of abnormal signs on your vehicle, you are right to be concerned, because a car represents a massive annual budget and unforeseen malfunctions don’t reduce the bill. So what if you find that you have a leaking injector on your Volkswagen Polo? You probably figured it out thanks to black/oily drips along your engine unit, or a troubled idle, or unusual black smoke. These three signs of illness are the main signals of a leaking injector. As this problem can bring on more significant engine problems on your car, we chose to prepare this article to help you verify the failure of a leaking injector and deal with it correctly. To achieve this, we will first take a look at the case of gasoline injectors and then at those of diesel injectors Volkswagen Polo.
Leaking injector on my petrol Volkswagen Polo
It is crucial to know that the injectors on petrol and diesel engines are different, in fact, the difference in combustion between these two kind 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 Volkswagen Polo: The different leaks
It should be mentioned that injector leaks on a Volkswagen Polo equipped with a petrol engine are rather rare. This is resulting from 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 part that is attached to the fuel rail, an O-ring will be involved in this. - Leak injector of the lower part:
Finally, you may encounter 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 sooner.
Leaking injector on my diesel Volkswagen Polo
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 Volkswagen Polo: The different leaks
In the case of leaking diesel injectors on your Volkswagen Polo, there are three several kind of leaks:
- Leakage from the injector inlet:
In this case, it is an inlet pipe that will deform as time passes, usually 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 Volkswagen Polo 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 bothersome, it is the junction between the engine and the injector nose that leaks at a copper seal, you should encounter an air noise and a compression loss. - If after examining you have oil leaking but it does not come from your injectors, we recommend you to read this article on the existence of oil leaking on your Volkswagen Polo.
Leaking injector on my Volkswagen Polo, 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. Regularly a leak is associated, 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 enormous, specifically on diesel engines. So you will have to take some measures:
- Lower the pressure before any work is done…
- Masking 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 regularly be limited to changing the seals that have failed:
- Situate 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 situations, these interventions are not specifically complex, but if you have the smallest uncertainty in the treatment of your injector that leaks on your Volkswagen Polo, we recommend you to get closer to your auto mechanic to avoid any bad manipulation that could critically harm the condition of your Volkswagen Polo.
If you want more tutorials on the Volkswagen Polo, go to our Volkswagen Polo category.
