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M272 Spark Plug Replacement
Thread Starter
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Joined: Dec 2006
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From: Camas, WA
2007 C230SS; 2014 ML350 BT
M272 Spark Plug Replacement
Attached are the WIS documents for spark plug replacement on the M272 engine. I am at 85K now so I am getting ready to replace them.
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Joined: Jan 2011
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From: Metro ATL
2001 E55 AMG (sold)
Are you going to buy the special Mercedes spark plug wrench or try it with a standard plug socket and a u-joint? Let us know how it goes either way.
Thanks for posting these. I've got awhile before I need to do mine, but its nice to know the docs are here.
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Joined: Mar 2004
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From: Boston, MA
'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
In the Spark Plug replacement WIS, step 1 is "Turn key in ignition switch into position 0". I wonder why they want you to keep the key in position 0. I would've thought to remove the key entirely from the ignition since you 'd be working with the spark plug cables and ignition coils.
I was expecting the step 1 to be "make sure the keys are not in the ignition".
I was expecting the step 1 to be "make sure the keys are not in the ignition".
Thread Starter
Super Moderator
Joined: Dec 2006
Posts: 2,403
Likes: 64
From: Camas, WA
2007 C230SS; 2014 ML350 BT
In the Spark Plug replacement WIS, step 1 is "Turn key in ignition switch into position 0". I wonder why they want you to keep the key in position 0. I would've thought to remove the key entirely from the ignition since you 'd be working with the spark plug cables and ignition coils.
I was expecting the step 1 to be "make sure the keys are not in the ignition".
I was expecting the step 1 to be "make sure the keys are not in the ignition".
I will probably replace the spark plug connectors too just in case.
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Joined: Jun 2002
Posts: 7,268
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From: So. Oregon Coast
C230 Sport Coup + 2006 W164 ML350 + 99 Ford Escort RIP
So, out of curiousity are there 6 plugs or 12?
Ha, you have the CP's right on top of the plug like the M111.
Well, you don't need wires, but the CP's get cooked from the heat.
Ha, you have the CP's right on top of the plug like the M111.
Well, you don't need wires, but the CP's get cooked from the heat.
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Joined: Nov 2008
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From: Wa
05 c230
In the Spark Plug replacement WIS, step 1 is "Turn key in ignition switch into position 0". I wonder why they want you to keep the key in position 0. I would've thought to remove the key entirely from the ignition since you 'd be working with the spark plug cables and ignition coils.
I was expecting the step 1 to be "make sure the keys are not in the ignition".
I was expecting the step 1 to be "make sure the keys are not in the ignition".
I just replaced my plugs last month with the keys out, the car seems fine. Do you know why it would have to be in position 0?
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MBWorld Fanatic!
Joined: Mar 2004
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From: Boston, MA
'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
I see no other reason to have the key in the ignition (even in postion 0) while replacing the spark plugs.
Out Of Control!!
Joined: Nov 2005
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From: OC
a quarter mile at a time
Spark plug replacement on the M272 is very easy and straightforward without the need of any special tools or equipment beyond what every DIY'er should already have.
M272 only requires 1 plug per cylinder.
M272 only requires 1 plug per cylinder.
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Joined: Mar 2004
Posts: 1,175
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From: Boston, MA
'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
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From: NYC
2007 C280 4Matic
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From: Boston
2006 C230 SS
Unfortunately I can't add any more than has been added above, but after looking at the set up, it does not look like it would be very hard to do at all. I love how much room there is to work with the 272 engine.
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
They are good for 100K if you run them in the self cleaning range for most of their life. If you potter around town & do many short trips they will not go that distance.
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From: Aventura, Fl
2006 C230, 2006 BMW M3, bye bye C55:(
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2006 C230 SS
2006 C230. I'm at 46,500 miles and it's time for Service B. A indy quote me $500 for service B and change of spark plugs.
Is it time for me to change my spark plugs also? I've seen thread where people replace it at higher mileages.
Thanks
Is it time for me to change my spark plugs also? I've seen thread where people replace it at higher mileages.
Thanks
Thread Starter
Super Moderator
Joined: Dec 2006
Posts: 2,403
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From: Camas, WA
2007 C230SS; 2014 ML350 BT
As Glyn pointed out if you run mostly highway you can get 100K out of them. I have 100K on mine in my 07, and they look damn good, so I have yet to replace them. Plan on replacing them shortly though.
Last edited by johnand; Apr 9, 2012 at 03:23 PM.
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From: Northeast PA-Poconos
2014 E350, 2006 C350 Sport(made it to 280k, loved it!), 1990 300E
For some strange reason MB lists 06 C-class with a 5year/78K change interval and 07 C-Class as a 5year/91K change interval. Even though there was no major changes from 06-07 on the M272 engines, and both 06 and 07 use the same spark plug number.
As Glyn pointed out if you run mostly highway you can get 100K out of them. I have 100K on mine in my 07, and they look damn good, so I have yet to replace them. Plan on replacing them shortly though.
As Glyn pointed out if you run mostly highway you can get 100K out of them. I have 100K on mine in my 07, and they look damn good, so I have yet to replace them. Plan on replacing them shortly though.
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2010 SLK350
I had one bunk downstream oxygen sensor that was causing the opposite bank to run pig rich, at a ST fuel trim of -25%!!
Anyway, even at only 70k miles, it didn't take long of it running that rich for it to foul one entire bank's worth of plugs in a hurry!
Replaced with OEM Bosch, something like $80 for all 6 (ouch!).
And then of course the 15 minutes it took to change was a breeze.
Anyway, even at only 70k miles, it didn't take long of it running that rich for it to foul one entire bank's worth of plugs in a hurry!
Replaced with OEM Bosch, something like $80 for all 6 (ouch!).
And then of course the 15 minutes it took to change was a breeze.
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Joined: Jun 2007
Posts: 33
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From: Phoenix, AZ
2005 C230K Sport Sedan
In the Spark Plug replacement WIS, step 1 is "Turn key in ignition switch into position 0". I wonder why they want you to keep the key in position 0. I would've thought to remove the key entirely from the ignition since you 'd be working with the spark plug cables and ignition coils.
I was expecting the step 1 to be "make sure the keys are not in the ignition".
I was expecting the step 1 to be "make sure the keys are not in the ignition".
This is super old, but I was wondering why as well. Then it dawned on me. This is a service program, so the customers' keys stay in the ignition I'm sure.
