EGR valve v new turbo

[Benscab123]

Do these tell you anything ?

[Benscab123]

That's not being too helpful - you really need to get it on Diagbox so you can see what the live flows are, and what the reference flows are, and also check the outputs and positions of the relevant sensors and how they are behaving.

Are there specific parameters you need to see ?

[RichardW]

You need to look in the parameter measurement section, rather than faults. Somewhere you should be able to see the air flow, turbo pressure, turbo valve position, EGR position etc. For each of them there should be an actual figure and a reference figure. With the engine at idle are the figures steady, and do they match the reference figures. If you accelerate the engine and hold the speed steady at say 2k and 3k rpm, do the readings move in the way you expect, do they stay steady, do they match the reference values?

The fault code is only a hint, unless there is something obviously amiss, then some detective work is required to suss out what is going wrong - especially bearing in mind the software was written by the French, and usually, it seems, after lunch!!

In your second pic the reference air flow is 200, but the sensor is reading 418 that's why it's flagged the fault, you need to get some idea of what it is doing normally, not just when it thinks there is a problem

[Benscab123]

Not sure if I’ve done this right, but the first lot of pics are at idle and the last lot at 2000rpm (or as close as i could keep it to that). At idle the airflow reference value fluctuated between 220 and 252 and at 2000rpm held steady at 240. The measured airflow at idle fluctuated between 459 and 465 and at 2000rpm held steady at 420. Not sure if that makes any sense to anyone. I also saw the fault for turbo pressure electrovalve control, which i had not noticed before.

[Benscab123]

You need to look in the parameter measurement section, rather than faults. Somewhere you should be able to see the air flow, turbo pressure, turbo valve position, EGR position etc. For each of them there should be an actual figure and a reference figure. With the engine at idle are the figures steady, and do they match the reference figures. If you accelerate the engine and hold the speed steady at say 2k and 3k rpm, do the readings move in the way you expect, do they stay steady, do they match the reference values?

The fault code is only a hint, unless there is something obviously amiss, then some detective work is required to suss out what is going wrong - especially bearing in mind the software was written by the French, and usually, it seems, after lunch!!

In your second pic the reference air flow is 200, but the sensor is reading 418 that's why it's flagged the fault, you need to get some idea of what it is doing normally, not just when it thinks there is a problem

Did you read my latest reply Richard ?

[RichardW]

Just saw this, and your other thread (which I have locked to keep everything to together)...

The high flow reading is consistent, and the EGR valve looks like it is moving as it should so your shout of the EGR cooler / pipework being blocked looks like it might be a good place to start. Getting it off is a bit of bugger however....

There's one other oddity in the last pic, the turbo position is 9% whilst the reference value is 100% - but then these don't have a turbo position copy sensor AFAIK!! Do these figures change when you rev the engine?

Don't worry about the ones that say value invalid - these only come into play when the DPF is regnerating.

There is one instance where the turbo pressure is less than the setting - does this value track the reference setting normally over the rev range ( you might need to drive with it plugged in under load to see this)?

[Benscab123]

I honestly don’t have a clue what I’m looking at Richard, but I think I remember that it does change with the revs. When I get a chance I’ll plug it in again and go for a spirited drive and see what you think.

[Sharkie]

Turbo underflow is probably caused by wrong actuator length setting. It is finicky. Did you reset ecu after new turbo and egr? Might still be running old parameters.
While new egr will resolve that egr error, it may not flow well enough or piping is still clogged. There's a lot of things to fix here at this point and all of them are related.

[Benscab123]

Ecu was reset after new EGR but I didn’t see any option to reset for new turbo in diagbox. Not sure how to adjust actuator setting.

[Benscab123]

Seriously ready to give up on this heap of junk now !!!
Replaced turbo pressure electrovalve and still getting underboost!!!!!!!!!
P***ed off doesn’t even come close

[Sharkie]

Just fix the turbo issue first. It is not the electrovalve - if it was the previous one would be bad too.
refurb turbos are usually set a bit low on boost, so they don't grenade themselves instantly.
Also check hoses for holes and leaks.

Bad vane/bypass position on turbo will cause EGR issues as well as it won't flow proper.

[Benscab123]

But the EGR fault was there BEFORE the turbo fault . Also, which hoses do I need to check ?

[Benscab123]

I’ve no idea how to set a turbo by the way, also a diagram/pic of these hoses and the location would help as I don’t know what I’m looking for. Thanks

[Sharkie]

Not the same fault if I read correctly.
Check all the air hoses that come from air filter to engine, they are big.

You adjust the turbo with nuts on a rod, won't recommend if you have no experience. Also your cat/dpf may be clogged.

[Benscab123]

Dpf was removed and cleaned before new turbo was fitted.