Ursachen für frühzeitigen ESD Verschleiß? | Posts 16+

nickx wrote:

I had hoped that maybe someone could find a use for the difference amounts.

"What? There's nothing about difference sets here! It only says 'ECU data read, number of errors: 0'. Please check what you uploaded."

This is (unfortunately) a multi-page TIFF file.
You must go to the next pages.

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

"For example, open with Windows Photo Viewer..."

Yes. Okay, my mistake. I just realized myself that it consists of multiple pages. I don't work with TIF files very often.

Regarding the difference sets: They're not top-tier, but they're still acceptable.

I wanted to know that already, thank you.
According to that, it is not the cause of the shaking when the vehicle is stationary.

The vehicle still isn't quite finished.
I'll just wait and see what happens.
It personally worries me when the injectors fail after only 70,000 km.

I'll let you know if there's any news.

Regards,
Nick.

"Quick question: How does the vehicle start? (Both when warm and when cold) Is the starting performance good or bad?"

I would say it's always good.
At least not obviously, why?

I once had an AKE engine (180 horsepower), and one of the four camshafts was installed misaligned by one tooth. Before the modification, it started perfectly every time with the old, broken-in camshafts. After the change, it started very poorly. So, that might have been the reason.

No, the amazing thing is that so far, nothing has changed my behavior.
Fortunately, everything is covered by the used car dealer's warranty.
He's obviously very upset and generally objects to every new measure. No wonder we only paid 10k for the car, and he's already added over 3,5k.

Good night.

Here are the pictures of the camshafts.
However, they are not the best.

Is the error fixed?

What is the fundamental error that occurs?

Initially, the problem was attributed to prematurely worn-out spark plugs. Later, it was described as an unstable idle.

I suspect the basic problem is an unstable/rough idle.

I once had problems with an A6, 150 horsepower, 220,000 kilometers, 2000 model.
He got the full treatment.

Camshaft, fuel pump in the tank, fuel injection pump, and injectors - all replaced. The fault is still present, but slightly less pronounced.

Has the compression ever been measured mechanically, rather than electronically or by measuring voltage?

In the aforementioned case, all cylinders had a compression pressure of 30 bar, except for cylinder 6, which initially had a pressure of 28 bar (and after approximately another 3,000 km, it only had 26 bar).

Bei der Druckverlustprüfung alle Zylinder gleich bei etwa 10-12 % ( 1. Measurement.

In the second measurement, after 3,000 km, all values were the same, ranging from 10-12%.

After driving 3000 km, I noticed that the engine was shaking strongly at 1700 RPM - one cylinder was misfiring, resulting in a rough idle, but otherwise the engine was running normally with normal fuel consumption.

The next day, I performed another leak test on cylinder number 6 (the engine was still in the same condition as the day before)!!! The leak rate was 80%, but I couldn't determine where it was coming from.

Zylinderkopf, runter Kolben 6. Cylinder out.

No scratches in the cylinder, piston rings in good condition, valves apparently in place and in good condition.

Then, proceed with engine repair and have the valves checked for leaks: the exhaust side shows a leak rate of 80%.

BUT, if you tapped the plate on a bleed valve, suddenly the pressure loss was only 8%.

After disassembling the valves, the problem became clear:

The armor on a valve had cracked, approximately 3-4 mm. Both ribs were still intact and sealing relatively well. A gentle tap was enough to achieve a proper seal.

The repair cost a lot of time and money, but even an endless story eventually comes to an end.

Please provide the text you would like me to translate from German to English.

Best regards, Harry.

The fundamental problem is a periodic shaking/vibration of the engine when it's idling.

So far:
All camshafts have been replaced.
All ESDs have been overhauled or new nozzles have been installed, and the pressure has been adjusted.
The pump was probably only checked superficially.

The error only occurs occasionally now.

However, this shows that the cause is something else.

Since it's not my car, there's not much more I can say.

Surely, there must be another way to test a leaky valve.
Putting my head down... that's not really my forte.

A compression test would certainly be a good first step.

Will I suggest it again?

Skoda still suspected a faulty dual-mass flywheel.
but everything is stuff that you can't just quickly try out on the side.

Regards,
Nick.

Which part of Germany are you located in?

Does the error only occur when the engine is idling?
Only cold or warm, or always?
Jerking or stuttering when starting?
Air in the diesel supply line to the pump?
Different behavior when the tank is full/half/relatively empty? (because it's periodic - it happens whenever the tank is below 3/4 or 1/2 full).

I still have a lot more questions like that!

Best regards, Harry.

Frankfurt/Main.
Hmm, I guess "HH" probably stands for Hamburg.
It's a bit far.

Nur kalt oder warm oder immer? Always.
Ruckeln oder Rupfen beim anfahren? No.
Luft im Dieselzulaufrohr zur Pumpe? No.
Does the behavior differ when the tank is full, half-full, or relatively empty? (because it's periodic - it happens whenever the tank is below 3/4 or 1/2 full). No difference.

Just keep going. Feel free to ask questions. It can only help us.

Regards,
Nick.

Aachen.

HH - my initials.

Do you have a diagnostic tool available, such as VAGCOM or similar, to read out data blocks?

I understand the periodic shaking or vibration as a 'wave' - brrrrrr ------- brrrrrrr ------- etc. - and it only occurs when the engine is idling?
'When the engine is idling, for example at 1,500-2,000 RPM, it's okay. However, during driving, whether under partial load, full load, in a constant speed range, or at a steady speed in all gears, the issue does not occur.'
Is that correct?

Please review the following.

- Does the rod possibly pivot from the vacuum actuator of the turbocharger (adjustment)?
Possibly remove the engine cover and the shield above the turbocharger.
- measure the vacuum at the vacuum pump (if there's a fault there, it could also cause poor performance).
or, in some cases, varying levels of power assist for the brake).
- Measure the vacuum directly at the inlet of the vacuum control valve.
(It's the electric valve where the hose from the turbocharger's vacuum actuator connects.)
depends on it).

When performing vacuum measurements, pay close attention to whether the value fluctuates in parallel with the periodic shaking/vibration.

I don't believe the injectors were defective, and the new ones won't be either, especially if they were sourced from Bosch directly. It's possible for one injector to have a defect – nothing is perfect – but for 3 out of 6 to be defective is very unlikely. If the problem reappears so quickly, the issue must lie elsewhere.
Fuel quality issues or contamination within the system, faults in the electrical system, or other control system problems, such as vacuum regulation.

Did the Bosch service remove the injectors again to check the spray pattern, or did they only perform the 'injector test' as indicated in the report? (Regarding: Finding that 3 new injectors have a poor spray pattern.)

By the way, this is not a 'jet test.'

This difference value in the injection process is the amount by which the required injection quantity is adjusted. This compensates for small differences between injectors, compression in individual cylinders, etc. This means it can have several causes and is not limited to just the injectors.
The goal is to ensure that all six cylinders operate with equal power; cylinders that are weaker receive slightly more fuel, while stronger cylinders receive slightly less fuel than the required injection amount, resulting in smoother engine operation.
The values are comparative values to cylinder 3 (which has the needle lift actuator) - cylinder 3 is the reference value - the other cylinders perform accordingly weaker or stronger.
The approximate limits are plus or minus 1.5 mg per dose.
The values are relatively okay. More importantly, the system seems to compensate for the differences within the specified limits.

While the camshafts don't look great, according to the photos, they are no worse than the ones that were originally installed.
'allowed' 0.5mm indentation.

Is it certain that the 70,000 km (approximately 43,500 miles) on the odometer is accurate, considering the roller rocker arms and the early replacement of the camshafts?

Currently driving a 2004 Passat 3BG with a BDG engine, manual transmission, and 200,000 km. The camshaft has not been replaced yet and is in good condition.

Best regards, Harry.

Aachen... it's not bad, I guess.

The shaking is as you described.
And only when standing still, but not always.
However, whether it's hot or cold.
During the drive, no unusual behavior was observed in any of the gears.
No abnormalities observed when idling at a higher RPM.

Subjectively, I had the impression that the engine was running a bit sluggishly.
"I feel like it's lacking a bit of power. But that's subjective, I'm driving a 330d myself."
It's incomparable.


I understand the concept of vacuum measurement.
However, there is no equipment for measuring.
I need to get that sometime.
I actually just need a pressure gauge for measuring vacuum.

Or rather, it only makes sense if the VTG is operating on a pendulum motion, right?
No issues found with the brakes or power steering.
BTW, what does the servo have to do with the vacuum system?

Regarding the nozzles, I completely agree with you.
I don't believe in any of that nonsense they're putting out.
Probably, the first ones produced after 70,000 km weren't bad either.
Regarding the camshafts, well, there's not much I can say about them.
I believe the engine is original, and the 70,000 km mileage seems consistent with the condition of the vehicle.
It's a bit strange.

Regards,
Nick.

VAG-Com is available.
What should we log?