In the event that you are aware of abnormal symptoms on your car, you are right to be worried, because a car represents a massive annual budget and unpredicted malfunctions don’t lower the bill. So what if you think that you have a leaking injector on your Alfa Romeo Giulietta? You probably figured it out thanks to black/oily drips along your engine unit, or a disturbed idle, or strange black smoke. These three manifestations are the main signs of a leaking injector. As this problem can produce more significant engine complications on your car, we decided to publish this article to help you confirm the failure of a leaking injector and treat it properly. To do so, we will first check out the case of gasoline injectors and then at those of diesel injectors Alfa Romeo Giulietta.
Leaking injector on my petrol Alfa Romeo Giulietta
It is vital to know that the injectors on petrol and diesel engines are different, in reality, the difference in combustion between these two sort 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 Alfa Romeo Giulietta: The different leaks
It should be said that injector leaks on a Alfa Romeo Giulietta equipped with a petrol engine are pretty rare. This is due to the much lower pressure in the petrol intake systems. Nevertheless, there are two sort 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 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 encounter a leak coming from the lower part of the injector of your car, this one will appear from the junction with the engine and not with the rail as seen sooner.
Leaking injector on my diesel Alfa Romeo Giulietta
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 Alfa Romeo Giulietta: The different leaks
In the case of leaking diesel injectors on your Alfa Romeo Giulietta, there are three several sort of leaks:
- Leakage from the injector inlet:
In this case, it is an inlet pipe that will deform after a while, generally the leak will be at the clamping point. - Injector return leakage:
As its name implies, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Alfa Romeo Giulietta will be caused by an O-ring or its plastic tip that leaks. - Injector base leak:
This injection leak is one of the most annoying, 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 verifying you have oil leaking but it does not come from your injectors, we recommend you to consult this article on the existence of oil leaking on your Alfa Romeo Giulietta.
Leaking injector on my Alfa Romeo Giulietta, how to fix the leak
And to finish, we’re going to check out how to fix a leaking injector on your car. Very often a leak is connected, as we have seen prior to this, to a worn seal caused by the pressures endured. But think that the pressure in the circuit is enormous, especially on diesel engines. So you will have to take some precautions:
- 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.
Concerning the repair part of your leak, it will oftentimes be limited to replacing the seals that have failed:
- Discover the source of the leak
- Take apart the injector in question
- Replace 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 specifically complex, but if you have the tiniest uncertainty in the treatment of your injector that leaks on your Alfa Romeo Giulietta, we recommend you to get closer to your repair shop to avoid any bad handling that could significantly harm the condition of your Alfa Romeo Giulietta.
To discover more tips on the Alfa Romeo Giulietta, take a look at the Alfa Romeo Giulietta category.
