E220 over fueling
- RavzSa
- S Class
- Posts: 85
- Joined: Tue 05 Mar, 2019 4:32 am
- Model you own: w124
- Region: Other (please specify below)
- Location: South Africa
E220 over fueling
Hi All,
Took the car out for a drive this weekend after a few months and noticed that the car is burning rich. I can distinctly smell a strong petrol smell from the exhaust.
From what I understand the ECU controls all of the fueling with info from the MAF. Fuel consumption was also pretty high.
I checked for error codes and didn't pick up any.
Could the MAF be faulty without reporting an error and could there be any other item that could cause this?
Thanks
R
Took the car out for a drive this weekend after a few months and noticed that the car is burning rich. I can distinctly smell a strong petrol smell from the exhaust.
From what I understand the ECU controls all of the fueling with info from the MAF. Fuel consumption was also pretty high.
I checked for error codes and didn't pick up any.
Could the MAF be faulty without reporting an error and could there be any other item that could cause this?
Thanks
R
1993 | W124 | 220E / E220 | WDB1240226B970861 | 230 000km
- Bartman4800
- SLS AMG
- Posts: 2786
- Joined: Fri 10 Oct, 2008 12:10 am
- Model you own: w111
- Location: Perth WA
Re: E220 over fueling
Try some injector cleaner first, poor atomization leads to black smoke.
Can you send some pictures under the bonnet? Earlier W124 had CIS, but yours might have multi point injection...
Bart
Can you send some pictures under the bonnet? Earlier W124 had CIS, but yours might have multi point injection...
Bart
Last edited by Bartman4800 on Fri 18 Nov, 2022 12:25 pm, edited 1 time in total.
1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
2012 W212 E250CDI
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
2012 W212 E250CDI
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)
- RavzSa
- S Class
- Posts: 85
- Joined: Tue 05 Mar, 2019 4:32 am
- Model you own: w124
- Region: Other (please specify below)
- Location: South Africa
Re: E220 over fueling
Hi,
Thanks, I shall try the injector cleaner.
Do you think theres any benefit in using a MAF cleaner as well?
Photos of engine bay below
Thanks, I shall try the injector cleaner.
Do you think theres any benefit in using a MAF cleaner as well?
Photos of engine bay below
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1993 | W124 | 220E / E220 | WDB1240226B970861 | 230 000km
- Bartman4800
- SLS AMG
- Posts: 2786
- Joined: Fri 10 Oct, 2008 12:10 am
- Model you own: w111
- Location: Perth WA
Re: E220 over fueling
Yes, the MAF sensor is situated just behind the air filter box. Buy some sensor cleaner; if it does not help, there's nothing lost
1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
2012 W212 E250CDI
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
2012 W212 E250CDI
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)
- John Green
- Mercedes Demigod
- Posts: 7677
- Joined: Mon 20 Jun, 2005 3:49 am
- Model you own: w112
- Region: Australian Capital Territory
- Location: Canberra-center of the known universe
- Contact:
Re: E220 over fueling
The early HFM system didn't have a lot of error codes that were helpful. One of the first things I would check is that the engine is getting up to operating temperature quickly (87deg) and that the coolant temp sender for the HFM module is reading correctly. Either being wrong will make the HFM module think the engine is cold and keep the mixture rich. Kind of like the coke being on when it shouldn't be.
Kind regards, / Mit freundlichen Grüßen,
John Green, Member Institute Automotive Mechanical Engineers
http://mbspares.com.au - Supporting Australia's Mercedes-Benz Enthusiasts.
John Green, Member Institute Automotive Mechanical Engineers
http://mbspares.com.au - Supporting Australia's Mercedes-Benz Enthusiasts.
- RavzSa
- S Class
- Posts: 85
- Joined: Tue 05 Mar, 2019 4:32 am
- Model you own: w124
- Region: Other (please specify below)
- Location: South Africa
Re: E220 over fueling
Would you know which is the coolant sensor for the HFM, i changed to single / double pole sensor but was told there is another sensor?John Green wrote: ↑Mon 21 Nov, 2022 9:54 amThe early HFM system didn't have a lot of error codes that were helpful. One of the first things I would check is that the engine is getting up to operating temperature quickly (87deg) and that the coolant temp sender for the HFM module is reading correctly. Either being wrong will make the HFM module think the engine is cold and keep the mixture rich. Kind of like the coke being on when it shouldn't be.
1993 | W124 | 220E / E220 | WDB1240226B970861 | 230 000km
- RavzSa
- S Class
- Posts: 85
- Joined: Tue 05 Mar, 2019 4:32 am
- Model you own: w124
- Region: Other (please specify below)
- Location: South Africa
Re: E220 over fueling
Also, the cold start idle / choke, stopped working years ago... not sure if this is linked to this sensor
Even after rebuilding the throttle body it didnt work again
Even after rebuilding the throttle body it didnt work again
1993 | W124 | 220E / E220 | WDB1240226B970861 | 230 000km
- John Green
- Mercedes Demigod
- Posts: 7677
- Joined: Mon 20 Jun, 2005 3:49 am
- Model you own: w112
- Region: Australian Capital Territory
- Location: Canberra-center of the known universe
- Contact:
Re: E220 over fueling
As in you changed from a single to a double pole? If you didn't replace like for like, I would suggest that is the first thing you should correct. Sensors can be quite fussy and need to be the same and either genuine or OE quality.
Kind regards, / Mit freundlichen Grüßen,
John Green, Member Institute Automotive Mechanical Engineers
http://mbspares.com.au - Supporting Australia's Mercedes-Benz Enthusiasts.
John Green, Member Institute Automotive Mechanical Engineers
http://mbspares.com.au - Supporting Australia's Mercedes-Benz Enthusiasts.
- RavzSa
- S Class
- Posts: 85
- Joined: Tue 05 Mar, 2019 4:32 am
- Model you own: w124
- Region: Other (please specify below)
- Location: South Africa
Re: E220 over fueling
I replaced all 3 coolant sensors this weekend with OE (Topran) - like for like
Didn't seem to make a difference but at least Iis all new now
Didn't seem to make a difference but at least Iis all new now
1993 | W124 | 220E / E220 | WDB1240226B970861 | 230 000km