Camshaft misaligned? | Posts 32+

Hi,

An "unexplained" performance loss in the PD system, it may also be caused by a misadjusted camshaft -> new technical article.

According to DZR, the correction on my engine only resulted in approximately 2 hp (as an overall value, 2 - 4krpm).

However, since the turbo boost was fully pronounced at around 2000 rpm, the power loss in the upper rpm range had to be concentrated, which was also noticeable as a somewhat sluggish increase in engine speed towards 4000 rpm.
I retrospectively estimate that approximately 5 - 10 horsepower were lacking.

Take a look in that direction...

Stoney wrote:

....Definitely, I won't be buying any more TDI's, I just find them too fragile.

Enjoy using other (Premium) manufacturers...


http://www.nie-wieder-bmw.de/bmw530d/
http://www.nie-wieder-bmw.de/bmw530d/story.htm


... they also only cook with water. I am aware of even more such cases.

@stoney : Have you had the timing belt replaced?

Greetings

Frank

No, the timing belt has not been replaced yet!

Hello,

I have reduced the AGR rate as much as possible in the adjustment channels of my AJM (with PSI-box) (AGR defect, which makes it pull better from the bottom), and I have increased the injection amount to the maximum. Since then, he's revving the engine much more willingly and also feels like he's achieving a few more km/h (miles per hour) thanks to the subjective feeling.

Nevertheless, my AJM is very sensitive to weather conditions, and I have the same experience with the Leihwagen Golf AJM. I drive the same highway route every day, about 60km, and if possible, I let it run. On some days, he'll rev the engine up to around 3900 RPM in 6th gear, which is approximately 215 km/h, and on other days, it might only reach 3500 RPM.

Notably, the LMM value is also striking. I recently had my 3rd. LMM installed (at 110,000 km) as the old one was still achieving 857mg/h at 3000rpm in 3rd gear, but it was dropping to 715mg/h at higher rpms.

The new exchangeable LMM (by the way, it is definitely a completely new one) achieves 960mg/h at 3000Upm in the VW test, but even with this LMM, the value decreases to approximately 820mg/h when driving at full throttle and around 3800Upm for a longer period. I was able to observe this behavior in all 3 LMMs.

Thomas K. wrote:

I have reduced the AGR rate as much as possible in the adjustment channels of my AJM (with PSI-box) (AGR defect, which allows it to pull better from the bottom), and I have increased the injection quantity to the maximum. Since then, he's revving up much more willingly and also seems to be going a few km/h faster subjectively.

Hi Thomas,

Adaptation-based tuning?

I haven't tried my ASZ yet, because it's essentially pointless on a VP-TDI due to the minimal changes it makes.
Do you have objective before-and-after comparisons (e.g., DZR test)?

Hello Ulf,

no, I unfortunately didn't conduct any DZR experiments

Well, I wouldn't want to talk about tuning, at least not yet.

Since I got the PSI box and the faulty AGR, the way the car handles, especially in the city, has really annoyed me. In the range of idle speeds up to 1800 RPM, it was completely dead, and then there was an explosion, which was almost unmanageable. With the AGR clamped, it was acceptable again.

So, I then completely got carried away during lunch with a colleague at Audi while having a work discussion, and the Q employee gave me the tip.

The fact is that he runs better when the AGR (air-fuel ratio) rate is reduced in the range of idle to 1800 rpm, which is noticeably and demonstrably so. Previously, he would stall when turning in 3rd gear. Walking around the city, even with full throttle, feels almost nothing.

By increasing the injection amount, he noticeably accelerates and responds more eagerly to the gas pedal.
He also seems to be able to rev the engine more freely (subjectively?).

Due to both measures, the 'turboloch' is no longer so pronounced.

Just give it a try, nothing can go wrong.

Thomas K. wrote:

The fact is that he runs better when the AGR rate is reduced in the range of idle to 1800 rpm.

Hi Thomas,

I have also reduced my AGR rate to the maximum (= adapted the air/fuel ratio to maximum), but I haven't noticed any improvement in throttle response so far.

Unfortunately, the numerical range of adaptation compared to the AFN is significantly reduced: The ASZ motor computer does not accept such high numbers, which likely restricts the adjustment options accordingly (this would be typical -> the newer the software, the less room for DIY enthusiasts).

Unless the "resolution" is lower, so that a larger change in air mass is hidden behind each individual step.
I had previously documented the adaptation range of the AFN, but not yet that of the ASZ. . .

Thomas K. wrote:

By increasing the injection amount, he noticeably accelerates and responds more eagerly to the gas pedal. He also seems to breathe easier when he's really pushing (subjectively?).

Does this measure result in increased consumption? If so, to what extent?

Hello Ulf,

'No, it seems like reducing the AGR rate didn't have any effect for you; your AGR is still functioning '

Basically, I was missing some emissions values due to a faulty AGR, and I was able to largely compensate for this by reducing the AGR value.

I've also noticed an increase in fuel consumption, at least in my daily driving cycle (80% on the highway at a fairly high speed). I still average around 7.2 liters / 100km.

@ garth :
Okay,



Does anyone perhaps have acceleration and elasticity values, especially from higher speed ranges, e.g., 140 km/h - 180 km/h?

What is the normal speed of the car according to the speedometer?

Golf IV 115 PS TDI PD AJM 6-Gang, Year of Manufacture 2/01

Greetings

Frank


To obtain the original elasticity values, you can refer to the article.
to keep in mind, unfortunately it costs 1.50€ (pdf file).
Or someone has the Gute-Fahrt issue 2/2000.

http://www.gute-fahrt.de/gf/test/VW/Golf/GolfGF200b.html
(relates to the Golf IV AJM 115hp TDI)

There are definitely some elasticity values (e.g., 10) specified there.


hello

Hello Thomas or anyone else

I have been searching for terms like "Adaption, Anpassungskanäle usw." in the search function for a long time, but nowhere is it described exactly how it works in practice, step by step. Therefore, I have the following questions:
Do you need the full VAG-Com version or is the demo version sufficient?
Logincode MSG?
Adjust values to what?
What should be considered?

Maybe someone has a link where it is described in more detail.

Thank you in advance.
Michi3


Drive a Passat AJM, which means 115 hp and 285 Nm of power from a Powerbox by PSI.

Hi,

The full version of VAG-COM is required.
http://shop.dieselschrauber.de/product_info.php/products_id/46

Login: 12233

What to consider:
- Record old values
- Don't start spraying too early

Is everything actually found using the search function? I would like to strongly advise against the careless experimentation with the adaptation channels!
Follow the corresponding repair guide and know what each change achieves before you perform it!

Hello, Rainer

Hello,

for the AJM in Channel 01, the fuel injection amount is set to 32780, and in Channel 03, the AGR rate is set to 33368.

No liability for damages caused by trying it.

...means reversing the number on channel 03 to 33638

Also, ich habe immer noch das gleiche Problem wie Max, und sogar den Eindruck, dass das Auto immer langsamer läuft. Selbst bergab, wenn ich vollgas gebe, erreicht es nicht einmal 190 km/h???
I'll probably go to the workshop tomorrow, with mixed feelings, because I've never been to one before and don't know who to talk to or what I can ask for without having to pay.
I hope that, after that, I will have clarity.

Best regards, Markus