In the event you are aware of unusual signs on your automobile, you are right to be preoccupied, because a car represents a huge annual budget and sudden breakdowns don’t reduce the bill. So what if you think that you have a leaking injector on your Mazda 5? You likely figured it out thanks to black/oily drips along your engine, or a troubled idle, or strange black smoke. These three symptoms are the main signals of a leaking injector. As this failure can bring about more significant engine complications on your car, we decided to produce this article content to help you confirm the failure of a leaking injector and treat it correctly. To accomplish this, we will first take a look at the circumstance of gasoline injectors and then at those of diesel injectors Mazda 5.


Leaking injector on my petrol Mazda 5

It is essential to know that the injectors on petrol and diesel engines are distinct, in fact, the difference in combustion between these two sort 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 Mazda 5: The different leaks

It should be mentioned that injector leaks on a Mazda 5 equipped with a petrol engine are rather rare. This is due to the much lower pressure in the petrol intake systems. Even so, there are two sort 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 part 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 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 Mazda 5

Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure creates 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 Mazda 5: The different leaks

In the circumstance of leaking diesel injectors on your Mazda 5, there are three different sort of leaks:

  • Leakage from the injector inlet:
    In this case, it is an inlet pipe that will deform as time passes, generally 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 Mazda 5 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 annoying, it is the junction between the engine and the injector nose that leaks at a copper seal, you should feel 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 browse this article content on the existence of oil leaking on your Mazda 5.

Leaking injector on my Mazda 5, 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 linked, as we have seen prior to this, to a worn seal due to the pressures suffered. But think that the pressure in the circuit is gigantic, specifically on diesel engines. So you will have to take some safety measures:

  • Lower the pressure before any work is done…
  • Covering 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 limited 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 assembly and tighten with a torque wrench in accordance with the manufacturer’s standards.

In all cases, these interventions are not specifically complicated, but if you have the smallest uncertainty in the treatment of your injector that leaks on your Mazda 5, we advise you to get closer to your mechanic to avoid any bad handling that could seriously harm the condition of your Mazda 5.

If perhaps you have any further questions about the Mazda 5, do not hesitate to consult our Mazda 5 category.