replacement of spark plugs wires 2001 C240 - Mercedes-Benz Forum
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#1 (permalink) Old 07-19-2010, 08:49 AM
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replacement of spark plugs wires 2001 C240

I need help on replacement of spark plugs wires on 2001 c240. The dealer wants 1200.00 to do this which is crazy. Please help....
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#2 (permalink) Old 07-27-2010, 12:43 AM
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Replacing plug wires C240 (M112 - V6)

Hello Nushram - This is a very easy project - all you need is a number 25 Torx socket to loosen up the coils and a 17 or 18 mm open ended wrench to pry (carefully!) the plug connectors off. You could probably get it done in less than an hour.

The wires ( there are 12, 2 per cylinder ) themselves run about $120 to $300 depending on the brand (Bosch, Beru, NGK, Champion or Bremi are the most common, but there are othres...) .

Personnaly, I usually stick with a German OEM supplior and I believe that would be Bosch, Bremi or Beru.

There are a couple of well documented DIY articles on changing the spark plugs AND the wires, but if it's just the wires, it's really very fast & simple.

Having said that, I suspect that your MBZ Stealership is quoting $1,200 for replacing both the plugs AND the wires.

Do some searching and I'm sure you'le find the DIY post on replacing spark plugs on the alloy V6 and V8 which is not much different.

Cheers, Michael
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#3 (permalink) Old 07-27-2010, 10:56 AM
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Thanks for the info. You are correct on the stealership they want to replace the plugs and wires. I am having a hard time tring to remove the plug connector. I am now looking for a 17mm spanner wrench to remove those connectors because I found info on how to remove the plugs. However no one seems to know where to get one. I also need help on the plugs also. I need info on how far to gap them.
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#4 (permalink) Old 07-27-2010, 11:18 PM
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What, you can't find a simple 17mm open end spanner ? Where are you located, on a deserted island or maybe the South pole ??????
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#5 (permalink) Old 07-28-2010, 09:18 AM
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Jacksonville, Fl.. I went to Auto Zone, Home Depot, Napa, Advanced Auto, ect.... They all did not have it I even took a pic to them and they still did not know or have what I needed. Habor FreightmTools is my next stop.
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#6 (permalink) Old 07-28-2010, 09:41 AM
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No, that can't be right, we are talking about the most basic tool there is.

Listen ANY 17MM OPEN END WRENCH WILL DO !

They are available EVERYWHERE and here's one at Autozone :

Great Neck/17 mm. combination wrench | Wrench | AutoZone.com

You are missing something here ...
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#7 (permalink) Old 07-28-2010, 09:44 AM
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Harbor Freight tools has the following set for $9.99.
Item Number is 99993.
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#8 (permalink) Old 07-28-2010, 09:46 AM
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Those WILL NOT work - that particular type of semi-closed head (forgot what they're called) will NOT slip over the connector - you need a plain old 2 sided open ended wrench for christ's sakes, nothing fancy 'bout that !
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#9 (permalink) Old 07-28-2010, 11:42 AM
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WELL WHEN I SHOWED THEM A PIC THEY ACTED LIKE I was an from outerspace!However since you have proved them wrong I will go back and try again....

THANKS and calm down hoss...lol
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#10 (permalink) Old 07-28-2010, 12:21 PM
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What did you show them a picture of ? The Mercedes 17mm valve adjustment wrench that was shown in one of the DIY articles on the web on how to change the plugs ? Sure that particular spanner is abit different than a normal eeryday open end wrench but believe me, any old wrench will do !

BTW: If you don't already have the most basic tools then maybe you really should'nt be fool'n 'round under the hood in the first place ...
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