m271 rich fuel mixture with adaptation in plus 201c P0172
#1
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C230K USA 1.8 192hp engine 271.948 w203.040
m271 rich fuel mixture with adaptation in plus 201c P0172
Hi guys, Im' from Moscow, this is my first post here on mbworld. I call in for your help as i can't find solution among our service society on our forums. I drive C230K sport sedan imported from California.
So I've got a problem with mixture, as a result I have heavy on fuel and errors 201C P0172 - rich fuel mixture. I've spent too much time muself and in services to find the reason and have alredy replaced all possible things which could cause the problem.
I prepared to this post and made huge service work in advance (stop oil leakage to the harness, cam shaft magnets replacement, first O2 sensor replacement on new one, air flow sendor replacement on original new one, checked all connections in intake for some kinds of air leaks, system of recycling crankcase gases replaced: houses, valves, vacuum houses of cat heating system replaced)
For your information catalisators deleted from the system and O2 sensor after catalisator turned off electronically.
So what i have as of today:
-Low voltage on first O2 sensor 1000 mV istead 1500 mV (means rich mixture)
-big fuel consumption especially on idle and low speeds in traffic jams especially.
-self adaptations on idle and partial loads in plus
-fuel pressure 3,75 stable on idle rev
-idle rev is stable 750 rpm +-5
So the most hard for understanding is unlogical behaviour of ECM. We have as given by O2 sensor data - rich mixture and at the same time we see that ECM (ECU) trying to rich misture more
I have conducted some experiment where i arranged air leak inside the system and got high voltage of O2 sensor, and arranged air leak out and got low voltage o2 senser
Below some screenshots form StarDiag and my ELM327 of current data
Did anybody faced with such behaviour? What else i should check in your opinion?
P.S. sorry for mistakes in text and big pictures is it possible to make spoilers for pictures here?
So I've got a problem with mixture, as a result I have heavy on fuel and errors 201C P0172 - rich fuel mixture. I've spent too much time muself and in services to find the reason and have alredy replaced all possible things which could cause the problem.
I prepared to this post and made huge service work in advance (stop oil leakage to the harness, cam shaft magnets replacement, first O2 sensor replacement on new one, air flow sendor replacement on original new one, checked all connections in intake for some kinds of air leaks, system of recycling crankcase gases replaced: houses, valves, vacuum houses of cat heating system replaced)
For your information catalisators deleted from the system and O2 sensor after catalisator turned off electronically.
So what i have as of today:
-Low voltage on first O2 sensor 1000 mV istead 1500 mV (means rich mixture)
-big fuel consumption especially on idle and low speeds in traffic jams especially.
-self adaptations on idle and partial loads in plus
-fuel pressure 3,75 stable on idle rev
-idle rev is stable 750 rpm +-5
So the most hard for understanding is unlogical behaviour of ECM. We have as given by O2 sensor data - rich mixture and at the same time we see that ECM (ECU) trying to rich misture more
I have conducted some experiment where i arranged air leak inside the system and got high voltage of O2 sensor, and arranged air leak out and got low voltage o2 senser
Below some screenshots form StarDiag and my ELM327 of current data
Did anybody faced with such behaviour? What else i should check in your opinion?
P.S. sorry for mistakes in text and big pictures is it possible to make spoilers for pictures here?
Last edited by Gramm; 03-26-2016 at 06:25 AM.
#3
Hi guys, Im' from Moscow, this is my first post here on mbworld. I call in for your help as i can't find solution among our service society on our forums. I drive C230K sport sedan imported from California.
So I've got a problem with mixture, as a result I have heavy on fuel and errors 201C P0172 - rich fuel mixture. I've spent too much time muself and in services to find the reason and have alredy replaced all possible things which could cause the problem.
I prepared to this post and made huge service work in advance (stop oil leakage to the harness, cam shaft magnets replacement, first O2 sensor replacement on new one, air flow sendor replacement on original new one, checked all connections in intake for some kinds of air leaks, system of recycling crankcase gases replaced: houses, valves, vacuum houses of cat heating system replaced)
For your information catalisators deleted from the system and O2 sensor after catalisator turned off electronically.
So what i have as of today:
-Low voltage on first O2 sensor 1000 mV istead 1500 mV (means rich mixture)
-big fuel consumption especially on idle and low speeds in traffic jams especially.
-self adaptations on idle and partial loads in plus
-fuel pressure 3,75 stable on idle rev
-idle rev is stable 750 rpm +-5
So the most hard for understanding is unlogical behaviour of ECM. We have as given by O2 sensor data - rich mixture and at the same time we see that ECM (ECU) trying to rich misture more
I have conducted some experiment where i arranged air leak inside the system and got high voltage of O2 sensor, and arranged air leak out and got low voltage o2 senser
Below some screenshots form StarDiag and my ELM327 of current data
Did anybody faced with such behaviour? What else i should check in your opinion?
P.S. sorry for mistakes in text and big pictures is it possible to make spoilers for pictures here?
So I've got a problem with mixture, as a result I have heavy on fuel and errors 201C P0172 - rich fuel mixture. I've spent too much time muself and in services to find the reason and have alredy replaced all possible things which could cause the problem.
I prepared to this post and made huge service work in advance (stop oil leakage to the harness, cam shaft magnets replacement, first O2 sensor replacement on new one, air flow sendor replacement on original new one, checked all connections in intake for some kinds of air leaks, system of recycling crankcase gases replaced: houses, valves, vacuum houses of cat heating system replaced)
For your information catalisators deleted from the system and O2 sensor after catalisator turned off electronically.
So what i have as of today:
-Low voltage on first O2 sensor 1000 mV istead 1500 mV (means rich mixture)
-big fuel consumption especially on idle and low speeds in traffic jams especially.
-self adaptations on idle and partial loads in plus
-fuel pressure 3,75 stable on idle rev
-idle rev is stable 750 rpm +-5
So the most hard for understanding is unlogical behaviour of ECM. We have as given by O2 sensor data - rich mixture and at the same time we see that ECM (ECU) trying to rich misture more
I have conducted some experiment where i arranged air leak inside the system and got high voltage of O2 sensor, and arranged air leak out and got low voltage o2 senser
Below some screenshots form StarDiag and my ELM327 of current data
Did anybody faced with such behaviour? What else i should check in your opinion?
P.S. sorry for mistakes in text and big pictures is it possible to make spoilers for pictures here?
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Besbenz (04-14-2022)
#4
MBWorld Fanatic!
Firstly how did you delete the o2 sensors electronically?
Secondly if you have in fact switched off closed loop. Why are you bothering to read o2 sensor values?
Secondly if you have in fact switched off closed loop. Why are you bothering to read o2 sensor values?
#6
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Mercedes Benz C180 Kompressor sports coupe M271
Seems a common problem, got it aswell. I think it might be the 12$ hose beneath the airbox, going to change it and see if it makes a difference. Doesn't look like it has any cracks or tears in it.
#7
In the meantime, a solution has been found. The failure was with the second catalyst. He collapsed and clogged the exhaust.
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#12
Same codes P2029-002 and P201C-001 mb203 c230k 2005
these codes also appear to me. who solved the problem? I have all the vacuum lines in order! Thanks whoever answers
#13
Same codes P2029-002 and P201C-001 mb203 c230k 2005
these codes also appear to me. who solved the problem? I have all the vacuum lines in order! Thanks whoever answers