CAYC ruckelt nach AGR-Kühlertausch | Posts 16+

So, the problem with my car, as I described it, simply resolved itself after 5,000 km.

The car suddenly started running perfectly one day, which almost drove me crazy. After replacing the AGR valve, the car was practically undriveable. The target and actual values of the AGR control were all showing signs of the misfire. "The MSG requested that AGR implement a jerky opening and closing mechanism, which resulted in the jerking motion."

Could someone here please provide some background information on what might be causing this error?
I have several cars with the same engine, and I don't want to simply install the original VW part every time, especially since I don't know if that part would have solved the problem anyway.

Hello,

Congratulations and thank you for the feedback.
Speculation: The AGR (AdBlue Granulate Recovery) rate is likely very high, which is causing the jerking.
If the air recirculation rate (AGR) decreases slightly, or if the amount of fresh air supplied (AGR = control loop) experiences a minimal reduction due to carbon buildup on the new component, then everything is okay.

However, that is pure speculation. Just as likely, the engine control unit could detect the problem and make a slight adjustment to the control loop, although that's just speculation.

Unfortunately, something I didn't think about a few weeks ago is that, using VCDS, it's possible to reset the learned values in the engine control unit through adaptation. It would have been worth trying.

Best regards, Rainer.

Hi Rainer,
It was not possible to reset the adaptation values of the AGR (Automatic Seat Belt Retraction) using VCDS. The "AGR Anlernen" option always ends immediately with "operation failed".
I also tried to perform this adaptation process using a Delphi tester, but it only listed the control unit functions that were actually functional. The AGR (Abgasrückführung - Exhaust Gas Recirculation) was not included. However, with LMM etc., everything could be reset.
Could it be that the AGR (Abgasrückführung) learning process is not supported by the Conti/Simos engine control units (which are installed here)?

Best regards,

Hello,

I am not familiar with the process of specifically resetting AGR learning values, and I am not aware of any vehicle where this is necessary.
"Resetting learned values" referred to the general learned values stored in the engine control unit (ECU).

If the engine control unit doesn't offer that option, it might simply not have it.

Best regards, Rainer.

Hello Rainer,

So, the "adaptation" of a new AGR valve is the standard procedure for many VAG vehicles when replacing a faulty valve. The Simos control unit operates in a completely different way compared to the familiar Bosch control units, so this function is simply not available in this type of control unit.

Unfortunately, the cause of the stuttering/jerking seems to remain a mystery.
And the uncertainty whether the same jerking would have occurred with an original VW AGR valve...

Best regards,

Hello, I'm experiencing the same problem with my CAYE engine. After replacing the EGR valve, I'm getting a rough idle around 2000 RPM. There are no error codes or anything else showing up. Basic settings via VCDS unsuccessful (it always displays "No active fault code").
Does anyone have a solution?
Best regards,
Alex.

Alexhelm281 wrote:

Hello, I'm experiencing the same problem with my CAYE engine. After replacing the EGR valve, I have a misfire at approximately 2000 RPM. There are no error codes or anything else. Basic settings via VCDS unsuccessful (it always displays "No active fault code"). Does anyone have a solution? Best regards, Alex

Autoscan Babe.