ESD Wear: Causes and Prevention

Hello,

I am looking for possible causes of premature nozzle wear.
The case:

Skoda Superb, manufactured in 2005, with a V6 BDG engine.
Only 70,000 km.

Symptom:
Strong shaking while stationary.

Already fixed:
Replaced worn camshafts (all 4).
--> No change.

Injectors tested at the Bosch service center.
All 6 have poor spray patterns.
I don't feel any pressure.
Pump checked --> OK.

Sure, here is the translation of the text from German to English:

"Note:"
The vehicle had been standing for approximately 9 months before the purchase.

I would appreciate any suggestions for possible causes.

Regards,
Nick.

Simply put: it's bad fuel. For example, fuel that contains water and acidic components.

When overhauling fuel injectors, you can often tell exactly what kind of fuel the vehicle was using. Cold-pressed oil and "waste recycling/disposal" practices are particularly damaging to the injectors.

Best regards, Rainer.

Rainer, you can already find all of this being sold at numerous gas stations (without your knowledge!). There was once an article in the local press about a commissioned study that was supposed to show the proportion of "additives" in diesel fuel. The study examined 5-liter canisters of diesel fuel dispensed at 18 gas stations in the region. The canisters were brand new. However, the newspaper was not allowed to publish the exact results due to a cease-and-desist order ("ongoing legal proceedings") filed by two mineral oil dealers. They did write, however, that not a single sample was found to be flawless by the commissioned laboratory. The samples contained impurities from gasoline additives, solvents, vegetable oil, and consistently a higher water content than allowed. The laboratory also stated that while the tested diesel fuel was suitable for operating diesel engines, it could certainly cause damage in the long term, as the impurities found could significantly reduce the fuel's lubricating properties.

Quote:

Cold-pressed oil and 'waste utilization/garbage disposal' are particularly damaging to wear.

The former is also simply a matter of purity.

As Hutfahrer already mentioned, we also have gas stations where customers regularly experience problems with the fuel injection system. This ranges from leaky nozzles to worn-out high-pressure pumps, which often leads to the injectors failing due to metal shavings.

I believe that many DPF problems are also caused by contaminants in the fuel. This can be a direct result, such as when a worn or carbonized injector produces too much soot, or it can be an indirect result, such as when the fuel contains too much ash due to illegal additives.

Hello,

Quote:

Rainer, you already get all of that here (without your knowledge!) at numerous gas stations.

It doesn't surprise me. Many years ago, I once refueled in Nuremberg, and afterwards, the transparent lines leading to the fuel injection pump became black on the inside. A significant amount of residue had built up.
What was also noticeable was the black smoke that came out after I had filled up the tank there (the car had a turbo installed at the time, but otherwise wasn't excessively modified).

A few tankfuls of fuel later (of course, somewhere else), the hose slowly became clear again, and the engine started running normally.

Furthermore, one might not be surprised if the price of gasoline in a so-called 'flood zone' is unexpectedly cheap.

Best regards, Rainer.

Quote:

This doesn't surprise me. Many years ago, I once bought fuel from a gas station in Nuremberg, and afterwards, the transparent lines leading to the fuel injection pump turned black on the inside. A significant amount of residue had built up.

Heating oil that has been disguised as old motor oil .

Well, fuel is obviously the first thing that comes to mind for most people.
Thank you for your responses.

Are there any other common causes that can lead to this?

New development:
Von den 6 neuen Düsen, gestern eingebaut, haben seit heute erst 3 jetzt 4 schon wieder ein schlechtes Spritzbild... What's going on?

Ich habe leider die Infos nur aus 2. Hand:
"Quote:"
"...I was actually hoping I could tell you today what the Bosch service found, but then I got another call yesterday with my new favorite phrase: "Mr. XXX, there's a problem with your car."
According to the testing device, three out of the six reconditioned fuel injectors still exhibit poor spray patterns. Possible causes include defective new parts, improper installation, or damage to the bracket (which was not replaced).

Bosch is at a loss!
As I said, no errors can be detected in the VP.

Is anyone else joining us?

Regards,
Nick.

Okay, in all the cases I'm familiar with, the injector holders have never been the problem... How about your diesel filter? Has that been replaced too? I would suggest changing it shortly before the injector replacement (not at the same time, because if it doesn't start afterwards, you won't know if it's the filter, the injectors, the ESP, or everything). That way, the injectors will definitely get clean fuel.

If they're already useless again, then, in my opinion, it's a matter of Bosch's goodwill, especially if it was purchased on account.

"There are also cheap imitations of these nozzles from that country [likely referring to China], and they behave in the same way..."

Ah, I misread. I thought he had bought the nozzles from Bosch and had them installed, which would have made it less likely. But in that case, it's definitely possible.

Yes, but of course, they are from Bosch.
This is all part of the same service appointment.
The car is still there.

I'm usually open to budget-friendly options, but I wouldn't even consider cheap nozzles.

Regards,
Nick.

nickx wrote:

Already fixed: Replaced worn camshafts (all 4). --> No change.

Did the camshafts sink into the body of your BDG engine, which has rocker arms?
Do you have any pictures?
That would be the first crawler tractor that I know of where the rear wheels have sunk into the ground.

So, it's not not my BDG.

According to the Skoda workshop, the problem with the breaking-in process of the new turbochargers has not been resolved by switching to RSH. They have encountered this issue multiple times before.
Unfortunately, I am unable to provide a more detailed statement on this matter.
I need to request the images from the owner of the BDG.
I think he even let them give him the old NWs (instructions/guidelines).

I'm chiming in again about this...

Regards,
Nick.

I have the protocol from the jet test here.
Unfortunately, I don't really know what to do with this.
Can anyone comment on that?

Images of the NWs will follow soon...

Regards,
Nick.

nickx wrote:

I have the protocol from the jet test here.

Could it be that you've attached the wrong file? This has nothing to do with a log.

Well, it made me suspicious too.
It looks like a few screenshots.
That's all he received from Bosch service.

I was hoping that maybe someone could find a use for these difference sets.