2011 C250 4Matic (C300) M272 Runs rough and sputters at speed
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Joined: Sep 2019
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2011 C250
2011 C250 4Matic (C300) M272 Runs rough and sputters at speed
Before I bring it back in to the shop I thought I’d check with all of you.
2011 C250 4Matic (Canada only, same engine as the C300)
Symptoms
Runs rough and sputters at 1600-2200 rpms, even worse up a hill.
Seems to run fine when cold, first few min.
Runs smooth while idling
Not throwing any codes or pending codes.
Replaced all the plugs, 4 Camshaft Adjusters, air filters and the intake manifold actuator (was broken)
Thinking maybe I should replace the Coils and the Fuel filter… Grasping at straws here…
2011 C250 4Matic (Canada only, same engine as the C300)
Symptoms
Runs rough and sputters at 1600-2200 rpms, even worse up a hill.
Seems to run fine when cold, first few min.
Runs smooth while idling
Not throwing any codes or pending codes.
Replaced all the plugs, 4 Camshaft Adjusters, air filters and the intake manifold actuator (was broken)
Thinking maybe I should replace the Coils and the Fuel filter… Grasping at straws here…
Super Member
Joined: Jun 2016
Posts: 562
Likes: 75
Mercedes w204 4matic sport
Before I bring it back in to the shop I thought I’d check with all of you.
2011 C250 4Matic (Canada only, same engine as the C300)
Symptoms
Runs rough and sputters at 1600-2200 rpms, even worse up a hill.
Seems to run fine when cold, first few min.
Runs smooth while idling
Not throwing any codes or pending codes.
Replaced all the plugs, 4 Camshaft Adjusters, air filters and the intake manifold actuator (was broken)
Thinking maybe I should replace the Coils and the Fuel filter… Grasping at straws here…
2011 C250 4Matic (Canada only, same engine as the C300)
Symptoms
Runs rough and sputters at 1600-2200 rpms, even worse up a hill.
Seems to run fine when cold, first few min.
Runs smooth while idling
Not throwing any codes or pending codes.
Replaced all the plugs, 4 Camshaft Adjusters, air filters and the intake manifold actuator (was broken)
Thinking maybe I should replace the Coils and the Fuel filter… Grasping at straws here…
Super Member
Joined: Sep 2015
Posts: 848
Likes: 87
From: Milwaukee, WI USA
2012 C300 4Matic
Joined: Nov 2016
Posts: 7,847
Likes: 3,496
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
You say “no codes”, but what did you use to scan? P0300 and associated cylinder codes for misfires should have shown up.
I can’t imagine a fuel filter being that clogged at only 180k.
I can’t imagine a fuel filter being that clogged at only 180k.
Last edited by JettaRed; Sep 12, 2019 at 08:04 AM. Reason: Change DTC to P0300
Thread Starter
Newbie
Joined: Sep 2019
Posts: 4
Likes: 0
2011 C250
180k kilometers, yes in Canada.
I've used a standard OBD2 reader as well as Toadscan, both show no codes.
I put in mid grade fuel 89 octane.
Never changed the fuel filter, don't mind as they're only $50 or so.
Thanks again for all the help guys.
I've used a standard OBD2 reader as well as Toadscan, both show no codes.
I put in mid grade fuel 89 octane.
Never changed the fuel filter, don't mind as they're only $50 or so.
Thanks again for all the help guys.
Joined: Nov 2016
Posts: 7,847
Likes: 3,496
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
What grade fuel does the gas cap say to use? If it’s 91 or higher, and you put in 89, that could definitely be your problem, especially if it gets worse under load.
Even though mine is designed to allow for e85 fuel, it still says 91 octane for normal gas.
Drive gently until you you get the 89 stuff out of the system.
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Joined: Nov 2016
Posts: 7,847
Likes: 3,496
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Do you have a 722.9 7G-Tronic tranny? You may want to check www.fdt-online.com as an option. Complete rebuilt 7G transmissions for US$3000.
https://fdt-online.com/722-9.html
https://fdt-online.com/722-9.html
Last edited by JettaRed; Oct 8, 2019 at 08:56 AM. Reason: Direct link to 722.9 tranny
