In the event that you are informed of abnormal signs on your vehicle, you are right to be concerned, because a car represents a big annual budget and sudden malfunctions don’t reduce the expenses. So what if you feel as if you have a leaking injector on your Volkswagen Polo 4? You probably figured it out thanks to black/oily drips along your engine unit, or a disturbed idle, or unusual black smoke. These three signs of illness are the main indicators of a leaking injector. As this problem can lead to more serious engine problems on your car, we chose to publish this content to help you ensure the failure of a leaking injector and handle it correctly. To accomplish this, we will initially take a look at the circumstance of gasoline injectors and then at those of diesel injectors Volkswagen Polo 4.
Leaking injector on my petrol Volkswagen Polo 4
It is essential to know that the injectors on petrol and diesel engines are distinct, the reality is, the difference in combustion between these two types of engines makes the injection distinct. The main 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 Volkswagen Polo 4: The different leaks
It should be known that injector leaks on a Volkswagen Polo 4 equipped with a petrol engine are rather infrequent. This is because of the much lower pressure in the petrol intake systems. Nevertheless, there are two types of leaks:
- Leakage from the top of the injector:
It is plausible that you have a leak from the top of the injector, this is the portion 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 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 Volkswagen Polo 4
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 4: The different leaks
In the circumstance of leaking diesel injectors on your Volkswagen Polo 4, there are three several types of leaks:
- Leakage from the injector inlet:
In cases like this, it is an inlet pipe that will deform as time passes, in most cases the leak will be at the clamping point. - Injector return leakage:
As its name indicates, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Volkswagen Polo 4 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 find an air noise and a compression loss. - If after checking you have oil leaking but it does not come from your injectors, we advise you to read this content on the presence of oil leaking on your Volkswagen Polo 4.
Leaking injector on my Volkswagen Polo 4, 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 caused by the pressures suffered. But think that the pressure in the circuit is monumental, 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.
Concerning the repair part of your leak, it will oftentimes be limited to swapping the seals that have failed:
- Identify the source of the leak
- Take apart 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 automatically complicated, but if you have the smallest hesitation in the treatment of your injector that leaks on your Volkswagen Polo 4, we advise you to get closer to your repair shop to avoid any bad handling that could severely harm the condition of your Volkswagen Polo 4.
If perhaps you have any additional questions about the Volkswagen Polo 4, do not hesitate to consult our Volkswagen Polo 4 category.
