Thank you for the LMM tip

Just wanted to say thank you for the tip about drilling holes in the mass airflow sensor housing to counteract age-related issues with the MAF sensor (article: Mass Airflow Sensor: An expensive weak point on TDI engines).

My AJM showed a reduced and undulating acceleration. After drilling a hole with a diameter of 2.5 mm, the symptoms disappeared .
'I wasn't able to check the size of the hole using VAG-COM (it showed 450 mg/hub at idle...), and it displayed 250 mg/hub both before and after drilling the hole.'

pepe wrote:

I just wanted to say thank you for the tip about drilling the air mass sensor housing to counteract age-related issues with the air mass sensor (article: Air Mass Sensor: expensive weak point on TDI engines). . . . My AJM showed reduced and erratic acceleration. After drilling a hole with a diameter of 2.5 mm, the symptoms disappeared .

You're welcome .

Quote:

Nur die Kontrolle der Größe des Loches mit Vag-Com (im leerlauf 450mg/hub...) war bei mir nicht möglich, es zeigte vor und nach bohren des Loches 250mg/hub an.

Did you disable the EGR valve before taking the measurement?
The value of 250 suggests this. Then, the AGR (Abgasrückführung - Exhaust Gas Recirculation) constantly adjusts this value.

She had been previously discredited, so I probably misunderstood the text!

'Quote from a scientific article:'
'With an inactive EGR valve (which switches between active and inactive every few seconds), the air mass value for the 1.9L engine should be between approximately 450 and 500 mg/stroke at idle.'
If this area is not reached, increase the opening.
This test naturally requires a completely functional EGR system.

The last sentence prompted me to get the AGR working again... anyway, I'll measure it with the deactivated AGR soon!

pepe wrote:

"For an EGR valve that is intermittently switching between active and inactive (every few seconds), the air mass value for the 1.9L engine should be approximately between 450 and 500 mg/stroke at idle." If this area is not reached, increase the opening. This test naturally requires a completely functional EGR system. Der letzte Satz hat mich veranlasst die AGR wieder fit zu machen...egal...dann werd ich das bald mal mit wieder stillgelegter AGR messen!

Okay, I understand. Please provide the German text you want me to translate into English. I will only give you the translation.

Quote:

dazu im Grundeinstellungs-Modus den AGR-Meßwerteblock aufrufen. Bein inaktiver AGR (alle paar sec. wird zwischen aktiv und inaktiv umgeschaltet) sollte der Luftmassenwert beim 1,9 l Motor im Leerlauf zwischen etwa 450 und 500 mg/Hub liegen.

Your (constant!) value of 250 mg likely wasn't measured in the default setting mode, because that mode produces fluctuating values.

I only suggested the test because you have to use VAGCOM anyway, and the basic settings mode repeatedly closes the EGR valve for a few seconds.
The higher LMM value occurs at the moment when the EGR system is closed.

Deactivating the AGR is essentially just as good for measurements, but it's more complicated (unless the AGR is already permanently deactivated).