EGR switches randomly - loss of power Mercedes C200CDI W202

[alexander jeitler]

Hallo zusammen, mein AGR (Unterdrucksystem) schließt manchmal nicht (Rückstauklappe und AGR bleiben beim Gasgeben geöffnet) Die Folge: Qualm und null Leistung. Ursprünglich waren die Drallklappen ausgehängt und verharrten in einer Teiloffen-Stellung, daher gabs Probleme beim Abgastest. Ich habe die Klappe eingehängt und die AGR-Mischkammer gereinigt, beim Warmlauf begann die Rückstauklappe gelegentlich zu "sägen" Abgastest war dann aber mehr als ok. Nur begann dann ab und an das AGR offen zu bleiben, als ich beschleunigen wollte. Das Symptom dauerte mehrere Minuten, dann lief er wieder normal, bloß das Symptom kam dann wieder. Fehler hat er keine abgespeichert. Mit einer anderen, gebrauchten AGR machte er genau das Gleiche, neue Druckwandler brachten auch nichts, der Tausch des Ladedrucksensors gegen einen Gebrauchten ebenso wenig. Luftmassenmesser kam vorher schon neu (Bosch) Die Drallklappen öffnen manchmal etwas verzögert, aber nie so, das man es praktisch merkt. Ich habe nun einfach den Schlauch vom Druckwandler der AGR abgenommen, um wenigstens im Notlauf fahren zu können.​

BEREITS ÜBERPRÜFT
Turbolader vor 10tkm getauscht Druckwandler AGR, Turbo und Drallklappen neu, AGR-Mischer gereinigt, Vakuumpumpe neu, Ladedrucksensor getauscht gegen gebraucht und Kanal ausgereinigt

Hello everyone, my EGR (vacuum system) sometimes does not close (backflow flap and EGR remain open when I accelerate) The result: smoke and zero performance. Originally, the swirl flaps were unhooked and remained in a partially open position, which is why there were problems with the exhaust gas test. I hung up the flap and cleaned the EGR mixing chamber, during warm-up the backflow flap occasionally began to "saw" but the exhaust gas test was then more than ok. Only then the EGR started to stay open from time to time when I wanted to accelerate. The symptom lasted several minutes, then it went back to normal, only the symptom then came back. He didn't save any mistakes. He did exactly the same thing with another, used EGR, new pressure converters didn't help either, and exchanging the boost pressure sensor for a used one didn't help either. Air mass meter was already new (Bosch) The tumble flaps open sometimes with a delay, but never in such a way that you practically notice it. I have now simply removed the hose from the pressure converter of the EGR in order to be able to at least drive in emergency mode.

ALREADY CHECKED
Turbocharger exchanged 10,000 km ago Pressure converter EGR, turbo and swirl flaps new, EGR mixer cleaned, vacuum pump new, boost pressure sensor exchanged for used one and channel cleaned

 

[Blobcat]

Hello everyone, my EGR (vacuum system) sometimes does not close (backflow flap and EGR remain open when I accelerate) The result: smoke and zero performance. Originally, the swirl flaps were unhooked and remained in a partially open position, which is why there were problems with the exhaust gas test. I hung up the flap and cleaned the EGR mixing chamber, during warm-up the backflow flap occasionally began to "saw" but the exhaust gas test was then more than ok. Only then the EGR started to stay open from time to time when I wanted to accelerate. The symptom lasted several minutes, then it went back to normal, only the symptom then came back. He didn't save any mistakes. He did exactly the same thing with another, used EGR, new pressure converters didn't help either, and exchanging the boost pressure sensor for a used one didn't help either. Air mass meter was already new (Bosch) The tumble flaps open sometimes with a delay, but never in such a way that you practically notice it. I have now simply removed the hose from the pressure converter of the EGR in order to be able to at least drive in emergency mode.

ALREADY CHECKED
Turbocharger exchanged 10,000 km ago Pressure converter EGR, turbo and swirl flaps new, EGR mixer cleaned, vacuum pump new, boost pressure sensor exchanged for used one and channel cleaned

Hello and welcome,

Please post in English as we’re a UK based forum and we ‘re well known for not speaking any other languages…

You can use Google translate

 

[alexander jeitler]

Hallo und Willkommen,

Bitte posten Sie auf Englisch, da wir ein britisches Forum sind und dafür bekannt sind, keine anderen Sprachen zu sprechen…:mit den Augenrollen:

Du kannst Google Translate benutzen

I an sorry, i will do it from now on.
I had the problem, that my browser was translating all in German. But he didn´t translate it back
Sorry and many thanks

 

[Blobcat]

Uh, sorry, I'll do it right away.
I hope my text can now be read in English, my browser translates everything into German.

No problem, we’re here to help but we‘re not much use if we don’t understand the issue…

 

[onefortheroad]

No problem, we’re here to help but we‘re not much use if we don’t understand the issue…

Mayswell chat to a Glaswegian

 

[oigle]

It is not uncommon for the egr piston to develop chatter marks that can cause it to stick open fractionally. Doesn't take much to upset the system. Maybe your used egr might have had a similar issue?

 

[alexander jeitler]

It is not uncommon for the egr piston to develop chatter marks that can cause it to stick open fractionally. Doesn't take much to upset the system. Maybe your used egr might have had a similar issue?

Both valves need a lot of vacuum power to open, the springs from valve and throttle are strong and the valves in a good condition, they will not act without a command from the ecu.

 

[oigle]

My 2003 270 motor is similar in egr function and I had the issue I outlined. Worth checking....

 

[mattkh]

. Ich habe nun einfach den Schlauch vom Druckwandler der AGR abgenommen, um wenigstens im Notlauf fahren zu können.​

What is a pressure converter in the EGR..?
Please put up some photos.

 

[alexander jeitler]

What is a pressure converter in the EGR..?
Please put up some photos.

 

[alexander jeitler]

The electropneumatic valve which is responsible for opening and closing the EGR, maybe my translation is irritating, we here in Austria call it Druckwandler which means pressure converter.

 

[alexander jeitler]

My 2003 270 motor is similar in egr function and I had the issue I outlined. Worth checking....

Best regards to Australia, and i have read the thread to delete the EGR. You can´t imagine, how i like to read such a thread, where only senseful comments and explainations are given. In the german speaking world, 3500 people would write: That is forbidden, bla, bla, bla.
I have to thank you and you have my respect.

 

[alexander jeitler]

In the moment the problem has gone.
I removed the brand new Bosch-MAF-Sensor and replaced it with a one year old Pierburg MAF-Sensor.
I do not know, if it is the final solution of the case, but now it works.

 

[mattkh]

In the moment the problem has gone.
I removed the brand new Bosch-MAF-Sensor and replaced it with a one year old Pierburg MAF-Sensor.
I do not know, if it is the final solution of the case, but now it works.

 

[mattkh]

Wunderbahr.
I did not know that Pierburg also make MAF sensors.

 

[alexander jeitler]

Wunderbahr.
Ich wusste nicht, dass Pierburg auch MAF-Sensoren herstellt.

Öh yes, they do so. I heard yesterday in one of the Mercedesgroups at facebook, that some other guys had problems with Bosch sensors and changed to pierburg.

 

[oigle]

Mine has a Pierburg. From what I have read, they are longer lasting than the Bosch.