In the event that you are informed of abnormal symptoms on your car, you are right to be worried, because a car represents a massive annual budget and surprising breakdowns don’t lower the expenses. So what if you think that you have a leaking injector on your Volkswagen Polo 3? You likely figured it out thanks to black/oily drips along your engine motor, or a disturbed idle, or uncommon black smoke. These three symptoms are the main indicators of a leaking injector. As this troubles can lead to more severe engine problems on your car, we made a decision to publish this content page to help you ensure the failure of a leaking injector and handle it correctly. To do so, we will initially look into the case of gasoline injectors and then at those of diesel injectors Volkswagen Polo 3.
Leaking injector on my petrol Volkswagen Polo 3
It is fundamental to know that the injectors on petrol and diesel engines are distinct, the truth is, the difference in combustion between these two kind of engines makes the injection distinct. The essential 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 3: The different leaks
It should be mentioned that injector leaks on a Volkswagen Polo 3 equipped with a petrol engine are rather infrequent. This is resulting from 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 connected 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 Volkswagen Polo 3
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 Volkswagen Polo 3: The different leaks
In the case of leaking diesel injectors on your Volkswagen Polo 3, there are three different kind of leaks:
- Leakage from the injector inlet:
In this case, it is an inlet pipe that will deform as time passes, commonly the leak will be at the clamping point. - Injector return leakage:
As its name indicates, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Volkswagen Polo 3 will be caused 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 examining you have oil leaking but it does not come from your injectors, we suggest you to read this content page on the presence of oil leaking on your Volkswagen Polo 3.
Leaking injector on my Volkswagen Polo 3, how to fix the leak
And at last, we’re going to look into how to fix a leaking injector on your car. Oftentimes a leak is linked, as we have seen prior to this, to a worn seal because of 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 achieved…
- Masking 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 oftentimes be restricted to changing the seals that have failed:
- Discover 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 automatically difficult, but if you have the tiniest hesitation in the treatment of your injector that leaks on your Volkswagen Polo 3, we suggest you to get closer to your motor mechanic to avoid any bad handling that could severely harm the condition of your Volkswagen Polo 3.
If you wish more guides on the Volkswagen Polo 3, go to our Volkswagen Polo 3 category.
