Engine Revs Briefly on Its Own?

Hello,

'I mentioned this problem here some time ago, but unfortunately, the previous posts didn't offer any helpful solutions. I have a Passat TDI with a 130 hp AVF engine.'
Occasionally, the car accelerates on its own while driving. It's only for a very short time, causing the car to briefly accelerate sharply and lurch forward (maybe for about 1 second).
das macht er auch wenn ich mich rollen lasse oder bremse, also bei Schubabschaltung. Ich habe festgestellt, daß dies nur bei bestimmten Drehzahlbereichen (ungefähr lt. Drehzahlmesser) passiert: bei 1600, 2000, 2600 und 3200 U/min. Aber nicht immer. Die Verbrauchsanzeige zeigt in diesem Moment auch einen Verbrauch an so zwischen 0,5 - 1,1 l/100km, wohlgemerkt bei Schubabschaltung, wo ja eigentlich kein Sprit befördert werden dürfte. Der Fehlerspeiche sagt nichts. Hhelp!!!

Best regards, Arne.

Okay, I just skimmed the old thread. As you mentioned, you've already replaced the coolant temperature sensor.

I'm afraid this error will only be resolved with a lot of research effort.

Several sources could be causing the error, so the only solution is to log data and hope that an outlier will appear long enough to identify it.

Can you somehow trigger the error?

"... that sounds so much like the G62 that, if I were you, I would exchange it again..."

It's possible that a new part could be defective, or perhaps there's an issue with the wiring to the G62.



It's better to waste 25 euros than spend forever searching for something.



Sven.

Hello,

I can't reproduce the error on demand. It only occurs when I drive for a long time within the specified RPM ranges. I only have a trial version of VAGcom, and unfortunately, I don't have a laptop to log data while driving. What else can I do?

Best regards, Arne.

It's possible that the ESP isn't fully recalibrating...
The consumption display also receives its data from the energy management system (EMS)/control unit.
Possibly the point machine is dirty or slightly misaligned.

It's just a guess; I had the same problem with my old Passat sometimes, but it was sold before I could find the cause.

Regards,
macro

Even if the G62 were defective, it should under no circumstances inject fuel at speeds far above idle and without the accelerator pedal being pressed. My suspicion leans more towards a faulty throttle potentiometer or wiring.

Hati wrote:

Even if the G62 were defective, it should under no circumstances inject fuel at speeds far above idle and without the accelerator pedal being pressed. My suspicion leans more towards a faulty throttle potentiometer or wiring.

...which can also be observed using a VAG-COM device or a multimeter.
However, I would choose an analog multimeter in that case, if a VAG-COM diagnostic tool is not available.

Regards,
macro

[Translating...]

Quote:

Könnte sein, dass die ESP nicht ganz zurückregelt... Die Verbrauchsanzeige bezieht ihre Daten ja auch von der ESP/Regelung. Evtl. ist das Mengenstellwerk verdreckt oder leicht verstellt.

Er hat keine ESP und auch kein Mengenstellwerk...

Regeldifferenzen vom MSW die so grob sind, daß das Fahrzeug von alleine beschleunigt gäben mit ziemlicher Sicherheit einen Fehlereintrag.
Was das Mengenstellwerk angeht ist die EDC ziemlich penibel. Schau Dir die Tolenranzen vom Vollast-/ Stopanschlag in MWB 19 an...