V50 Engine 2.0D : Injector Failure? Diagnosing Which One?

[IanW82]

Hi,

Recently been suffering an issue with my 2008 V50 2.0D (unsure what engine exactly but has the single port throttle body).

Runs really lumpy on startup like its misfiring, plus blows out a load of white smoke, once it is running the smoke clears. When it is up to temp it runs better but still feels like is it hunting and missing.

Had it in a local garage today and they have diagnosed a faulty injector.

Do they have to be coded in or can I pick up a second hand injector and fit it? Is there anyway to diagnose the faulty one myself, on my old petrol cars I could read the resistance on them to determine the faulty one - can this be done on diesel injectors?

Thanks!

[Tannaton]

The injectors aren’t individually coded as such but they come in a number of different classes, all four should match and if you change all four to a different class then you need to update the setting in the ECM. I think the class code relates to the diameter of the injector internals and hence fuel delivery. The class is marked on the plastic cap on the very top of the injector.

However…. I’ve seen several engines running acceptably well with mixed injectors, though I wouldn’t personally recommend it, especially if you have a DPF equipped car.

From memory there are a number of test functions in VIDA where you can shutdown individual injectors and see the impact on RPM and also view on-going self learning compensation - I think…

Have a read of this, it refers to the same engine, https://frenchcarforum.co.uk/forum/v...ic.php?t=60311 (not the specific fault but how to identify injectors)

[wynnj]

Originally Posted by IanW82

Hi,


Runs really lumpy on startup like its misfiring, plus blows out a load of white smoke, once it is running the smoke clears. When it is up to temp it runs better but still feels like is it hunting and missing.



Thanks!

White "Smoke" on start up is often/usually a sign of coolant entering a cylinder as a result of e.g.a leaking head gasket. Have you checked your coolant level?

[Tannaton]

Originally Posted by wynnj

White "Smoke" on start up is often/usually a sign of coolant entering a cylinder as a result of e.g.a leaking head gasket. Have you checked your coolant level?

I would sniff it whilst someone starts the car, if it smells diesely then it's fuel, if it's steamy and quickly disperses then water...

[Lukasguy]

My experience with injectors comes from the 1.6 D2 engine (D4162T), so I'm not sure if this applies to the 2.0D.

All 4 of my injectors were going bad, but the one on cylinder no 2 was in the worst condition. VIDA would tell me if there was a problem with an injector and which one. So I had a code of "fuel offset max limit" for injector 2. This way I knew this one was bad. Did you read the codes in the car using VIDA?

In case of the 1.6D2, the injectors have a specific code on them which needs to be entered in the CEM. I did this using VDash. They also need adaption which is done using VIDA. This software is uploaded by the dealer first (as I did not have this yet). But once you have it you can do the adaptation yourself.

I later replaced the rest of my injectors, coded and adapted them myself and they have been perfect for more then a year now.