Should injectors be replaced with these values?

Hi everyone,
I drive an Audi A6 3.0 TDI from 2012 with the 245 hp CDUC engine. Current mileage: 275,000 km.
The engine makes a noticeable rattling sound when accelerating, and there's also a noticeable lack of power.
The error memory is clear.

I've attached a photo here that shows the injector readings at idle with the engine almost warm.

Before I damage the engine by running it with worn or clogged injectors, I'd rather ask a question first...

Cylinder 1 looks good, but cylinder 5 occasionally shows a value of up to 0.27.

Should I exchange them all?

If I understand correctly, based on what I've read here and on the internet, cleaning doesn't really make much sense.

Edit: Brand new Bosch injectors are available for significantly less than 300 euros per piece.
While the action might not be cheap, it's still better than having a broken engine.

Thank you very much for your efforts, and best regards.
Wolfgang.

Hi,
The values all look good, but number two is a little elevated. If you want to know more about the condition of the injectors, you can check the injector timing correction values.
Your problem, however, stems from a different source. Are the throttle valve and/or the swirl flaps in good condition?
hg
Herbert.

Hi Herbert,

Thank you for your reply.

Of course, I'm pleased that the values are within the acceptable range.
I guess I'll have a lot more reading to do online. It seems I had misunderstood something regarding the values.
I'll take a look at the timing correction values and try to understand what they're telling me.

Regarding your question about the flaps, I am unable to answer it at this time. I'm completely at the beginning again regarding the investigation into the causes.
I'm going to look into the flaps now.
Thank you for the tip.
Due to the harvest season, it might take a few days longer for me to have new information, but I will get back to you then.

Regards,
Wolfgang.

Hi everyone,

I once read out the rail pressure calibration points.

Unfortunately, I can't find any information about the target values for models 4G and later online, so I'm unable to assess those values.

Could someone please give me a very brief assessment of these values?
Sure, I'd be happy to.

As I mentioned, I'm still looking into the valves and will examine them once I have more information.
At 275,000 km, there's certainly going to be a lot of grime and dirt present.

Here are the values in microseconds:

Injector 1 Rail pressure calibration point 1 -7.70
Injector 1 Rail pressure calibration point 2 -15.40
Injector 1, Rail Pressure Calibration Point 3: -21.25

Injector 2, Rail Pressure Calibration Point 1: -1.95
Injector 2, Rail Pressure Calibration Point 2: -11.95
Injector 2, Rail Pressure Calibration Point 3: -15.50

Injector 3, Rail Pressure Calibration Point 1: -1.05
Injector 3, Rail Pressure Calibration Point 2: -10.10
Injector 3, Rail pressure calibration point 3: -13.50

Injector 4, Rail Pressure Calibration Point 1: -15.35
Injector 4, Rail Pressure Calibration Point 2: -20.80
Injector 4, Rail Pressure Calibration Point 3: -25.95

Injector 5, Rail Pressure Calibration Point 1: -2.20
Injector 5, Rail Pressure Calibration Point 2: -12.30
Injector 5, Rail Pressure Calibration Point 3: -21.90

Injector 6, Rail Pressure Calibration Point 1: 3.95
Injector 6, Rail Pressure Calibration Point 2: -10.70
Injector 6, Rail Pressure Calibration Point 3: -10.55


Thank you very much for your effort, and best regards.
Wolfgang.

Hi,
You can find the entire discussion here: /viewtopic.php?t=28779
According to this, your nozzles would already have quite high correction values at high pressures, meaning they would remain open for too long without any correction.
However, I'm not sure if that's the cause of the problems described.
hg
Herbert.

Hello Herbert,

Thank you for the link. I've entered my information there. So far, no engine with the MKB CDUC or CDUD designation has been included.

My scores would be terrible even at the 4F level.
I can't find any reference values for my 4G signal that would allow me to make a comparison, but you mentioned that those values are already noticeable in the load range.

However...
The fact that I intend to take over the flaps is undeniable.
I skimmed through some articles about it last night.
Before I invest roughly 1700 euros in the nozzles, based on today's prices, I'd like to know if everything else is okay, and I'd appreciate your advice on that.
Only then does it make sense to ask questions here.

Thank you for your effort.

Regards,
Wolfgang.

Something you can still do without making a large investment is to measure the return flow rates of the injectors, both collectively and individually. The manufacturer provides specifications for the acceptable limits. You need the data for the CDUx - six-cylinder engine.
hg
Herbert.

Yep, I will definitely also test the return flow rates. It even goes under the carport.

I saw this topic yesterday evening as well.
I will definitely replace the fuel injector that deviates from the specified values (after checking here ), even if it doesn't have anything to do with the problem or shouldn't be related to it.


Regards,
Wolfgang.