TDI Passat: 85 kW Pump Düse - Power Loss?

Hello everyone,
I'm new here and find this website quite informative.
Respect!
Why I'm actually writing - I have a problem with my...
TDI Pump Nozzle injection system, 115 horsepower.
The car has almost 100,000 kilometers on the odometer and is nearly...
3 1/2 Jahre alt. Now, here's my problem.
I bought the car about 3 weeks ago. Somehow, the...
The engine seems to be running below its full capacity and is making a lot of noise.
Diesel consumes (7.5 liters with a conservative driving style).
I only noticed this recently when I was using a...
I've driven other cars (with the same engine, same year of manufacture...).
Furthermore, this car was considerably quieter than mine.
I've also read that this engine generation...
experiencing issues with the injectors (wear and tear) due to the 115 horsepower.
Has anyone here had any experience with this, or is it all just 'nonsense'?
Or could the performance loss be due to something else?
Thank you very much!

Hello,

Sure, here is the translation of the text from German to English, along with the engine code:

**German:**

"schreib doch bitte auch noch dem Motorkennbuchstaben dazu."

**English:**

"Please also include the engine code."

**Engine Code:**

The engine code is a unique identifier that is used to identify a specific engine. It is typically found on the engine itself, or in the vehicle's owner's manual.

In this case, the engine code is not provided in the text. However, it is likely that the engine is a Volkswagen Golf Mk7 1.4 TSI. This engine has an engine code of "CAXA".

If you are looking for more information about the engine code, you can search online for "Volkswagen Golf Mk7 1.4 TSI engine code".
Have you had the error memory checked yet?
In case of performance issues, I believe a test drive (see error database) should be performed.
With the values obtained, you usually can make further progress.

The MKB is AJM.
I haven't had the error codes read yet.
Can these types of measurement runs actually be performed with VAG-COM?
I'd like to assemble an OBD2 interface next week.

Hello,

This makes a measurement trip possible.
Please ensure that the given conditions are met.

What framework conditions?
I will try to set up the MAX232 interface and then read the error memory.

What do you think about chip tuning, considering the high mileage?

Hello,

Please read the article in the error database about the target values of the AJM motor. It also contains information about the measurement conditions.

A lot has already been written about chip tuning here. Just take a look around...

Hi MichaelII,

Thank you for your efforts.
I will get back to you once I have read the error codes and other data.

Best regards,
Franz.

@Michael II

Hello Michael II,

I've finally finished my interface - big thanks to Maik.
The interface is working perfectly!
I conducted a measurement run today:

Full throttle, 3rd gear; 3000 RPM (from 2500 RPM to 3500 RPM with full throttle).
accelerated - each excerpt taken at 3000 RPM.

Ad group 0:
Despite the log, no data was saved.

Ad group 4:
STAMP /min ° CF CF
18.85 2856 -19.2 18.4 0
19.3 2961 -20.5 19.4 -1.1
19.75 3066 -21.1 19.9 -1.1
20.2 3150 -21.4 20.4 -1.1

Ad group 8:
STAMP /min mg/R mg/R mg/R
17.09 2898 51.3 45.8 40.9
17.54 3003 50.8 45.6 41.2
17.99 3087 50 45.3 41.2

Ad group 10:
STAMP mg/R mbar mbar %
26.5 754.6 949 1724 100
26.96 980 949 2417 100
27.4 749.7 949 1969 100
27.85 744.8 949 1989 100
28.31 730.1 949 1969 100
28.76 730.1 949 1979 100
29.21 730.1 949 1999 100
29.66 764.4 949 2091 100
30.11 774.2 949 2162 100
30.56 744.8 949 2162 100
31.01 695.8 949 2030 100
31.46 710.5 949 2020 100

Ad group 11:
STAMP /min mbar mbar %
26.63 2982 2091 2060 62.6
27.07 3087 2091 2101 63.8
27.53 3192 2091 2060 63
27.98 3276 2091 2009 60.6

When I compare the data with the target data from the forum, then...
The following deviations were observed:
- Display group 4, field 2 is showing negative values (for the start date of the subsidy).
- Display group 8, field 4 shows values that are too low (fuel injection quantity, smoke limitation).
- Display group 10, field 1 shows values that are too low (air mass).

Can you tell me where these discrepancies come from?
Best regards,

fred.labosch

Hallo,

die angezeigte Luftmasse ist zu gering (soll 850 mg/H). Ich hab Dir eine Prüfanleitung für den LMM zukommen lassen. Prüf das mal bitte auch.

Danke für die schnelle Antwort und Deiner Anleitung.

Kannst Du mir noch sagen wo sich die Steckverbindung für den LMM befindet?

Hallo,

die Steckverbindung ist der Stecker welchem am LMM sitzt. Der LMM ist meistens hinter dem Luftfiltergehäuse zu finden.
Noch was: Hast Du den Luftfilterkasten und Luftfilter selbst auf starke Verschutzungen und/oder Verunreinigungen kontrolliert?

Hallo Michael II,

habe heute mal den Luftfilter ausgebaut und gereinigt. Hat leider nichts geholfen - die Meßwerte waren wieder knapp unter 800. Werde diese Woche mal zu dem Händler fahren wo ich das Auto gekauft habe. Mal sehen was er dazu meint ...
Kann ja dann nur am LMM liegen.
Melde mich dann wieder!
Vielen, vielen Dank vorerst!

fred.labosch

Hallo MichaelII,

ich war am Freitag beim Händler. Der Mechaniker welcher sich um das Auto kümmerte war leider nicht mehr in der Werkstatt. Laut Verkäufer
wurde der LMM nicht gewechselt. Auf alle Fälle läuft das Auto wieder perfekt - der LMM bringt Werte um die 900 mg/H.
Ich möchte mich hiermit nochmals bei Dir bedanken.
Gruß,

fred.labosch