Nozzle swap when?? T4 TDI ACV, 230,000 km

Hello!

When should I replace the injection nozzles ?

Regards,
Onclebenz

80,000 km ago...

or, to put it another way; you should expect to pay that amount starting from 150,000.
that the nozzles are no longer functioning as intended. You should at least...
have the spray pattern checked (although I'd prefer to skip this 'investment' once the machine has accumulated some operating hours).
would be - instead of immediately installing new nozzles).

Best regards, Rudi.

Rudi wrote:

before 80,000 km... or, to put it another way; you should expect to pay that amount starting from 150,000. that the nozzles are no longer functioning as intended. You should at least... have the spray pattern checked (although I'd prefer to skip this "investment" once the machine has accumulated some operating hours). would be - instead of immediately installing new nozzles). Best regards, Rudi

Hello!

I just contacted my BOSCH service, and they told me I shouldn't do anything until there are problems.

What is correct? ...Will the nozzles possibly be inspected during an inspection?

Can VAG.COM be used to diagnose injector faults?

Regards, Onclebenz.

Hi,

The statement from the Bosch service: 'If injector faults were always this clear-cut...'
that they become noticeable before anything is damaged...
Nothing has to break, but the risk would be too high for me personally.

During an inspection, the nozzles are not checked (as far as I know).
(which, unfortunately, is now the typical level for windshield washer fluid refills).

VAG-COM: possibly via group 13 (idle speed control); if the values are increasing...
Observing differences between the individual cylinders could be an indication.
to be. However, I am not aware of any conclusive evidence supporting this approach.

Best regards, Rudi.

Hello,


VAG-COM: possibly via group 13 (idle speed control); if there are increasing...
Observing differences between the individual cylinders could be an indication.
to be. I am not aware of any conclusive evidence regarding this approach.

Okay, VW states that the fuel injectors should be tested via group 13. The fuel injection amounts from cylinder to cylinder have tolerance limits. I believe the maximum deviation allowed is 4mg. I can double-check it again.

THANKS! I'll check that out .

4mg what?

That's the full flow rate at idle, depending on the pump's performance curve.

"That is, they only start looking [for something] when there isn't a cylinder left."

And what happens when all the nozzles are malfunctioning in a somewhat similar way? Then you have a 0 mg deviation, but the nozzles are still dripping or there are holes in them...

m;
who is already saving up for new dentures .

Well, there are two possibilities:

Either the car is working perfectly -> in which case, let it drip, or you go and complain, and then it costs money .

'The V6 engine has approximately 6 mg of idle fuel consumption, and even more, around 12 mg, when running with the automatic transmission (D+brake). At least, that's what mine shows. I'll check the exact value that they specify tomorrow, just to make sure I'm not posting anything incorrect.' But I'm actually pretty sure I read 4.

Hi,

I've been digging through my documents again...
Group 13 initially only indicates the deviation in fuel injection quantity.
For the ACV, this represents the deviation from the 3rd value. Cylinders; +/- 2mg is specified as the acceptable tolerance.

Best regards, Rudi.

Rudi wrote:

Nothing has to break, but the risk would be too great for me personally.

Hi Rudi,

What risk? We've discussed this topic several times here, but to this day, I don't know anyone who has destroyed their engine with old injectors . However, the needle lift valve should be replaced more often, okay, but the rest can be left in if you drive normally. Of course, the spray pattern changes over time, and thus the efficiency (a little more soot, etc.). However, in my opinion, this is not proportional to the cost of new nozzles.

"In our Audi, we replaced the injectors after 260,000 km. Not much changed (especially not the fuel consumption, although the exhaust smell was slightly more pleasant). In my Passat, the injectors (excluding the NHG - likely referring to a specific type or brand) have been in for 210,000 km." I will serve as a guinea pig and prove that you can easily get these to 300,000 km.

Hi,

Perhaps the name "Ölklaus" means something to someone. He's driving a TDI engine that runs on over 90% biodiesel.
"Now, this is the second replacement engine that has failed. Each time, it's the third cylinder that goes bad – once it was the piston rings, and the next time the piston itself was melted."
The nozzles were always the same and, of course, were reinstalled in every rebuilt engine.

Best regards, Rainer.

Rainer K. wrote:

every time, the 3rd cylinder is failing, once it was the piston rings

Hi Rainer,

NHG=3. Cylinder. I'm also cautious about the needle lift injector (although this was also installed until the end in our Audi: statistically, of course, it doesn't say much). But for the rest, I think it doesn't matter. I can't judge the effects of PÖL, so I'm staying away from that nonsense.

Hey haehnlein,
You can skip being the guinea pig; I've already done that.
I agree about the nozzles!
My car now has 308,000 km (approximately 191,000 miles) on it, and the engine is running well. It's even been slightly tuned.
I think it's excessive to check or replace the injectors at 150,000 km. How can a TDI engine still be economical under those circumstances?
However, since my natural gas heater occasionally malfunctions, although not very often, I will eventually need to replace the nozzles.
Otherwise, I wouldn't be willing to spend over €400 on new nozzles.

Regards,
Sausage blinkers.

Well,
Now, all the skeptics are silent.
Ok, Ok.
is certainly not representative of all TDI models.

Sure, here's the translation:

'MFG' is an abbreviation for 'Mit freundlichen Grüßen,' which translates to 'Sincerely' or 'Best regards' in English.