An engine running at 2000rpm cruising down the road means the spark plug has high energy ignition voltage arcing across the spark plug gap 1500 times per minute on a 6 cycle engine. Every time an electric current arcs across two metal surfaces one electrode (anode) loses material and the other electrode (cathode) gains carbon from the arcing. A very small amount of current passes through a spark plug so the arcing is not a problem in the short term. In addition, the explosion of combustion also wears away the spark plug electrodes over time. As the spark plug gap widens the heat generated by the spark becomes weaker and has a harder time igniting the air / fuel mixture. This leads to inefficient combustion, which reduces fuel economy, increases emissions and reduces power output.

Replacing the spark plugs on your W211 is part of routine maintenance. Mercedes-Benz recommends replacing the spark plugs on 6-cylinder models every 100,000 miles or every 5 years. With all the major engine design changes over the years, spark plugs now last up to three times as long as they did in years past. This is good and bad. It means you save money and time not having to service them so frequently, but run the risk of a spark plug seizing in the cylinder head. I suggest replacing your spark plugs every three years regardless of mileage. If the last time they were serviced is unknown, replace them right away.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

When servicing your spark plugs be sure the engine is cool and leave yourself about an hour to do the job. Be careful not to drop a spark plug. If you do, replace it. The spark plug insulator can crack and can lead to an engine misfire.

Read the Full Article: https://www.pelicanparts.com/techarticles/Mercedes-W211/53-ENGINE-Spark_Plugs_Ignition_Wires_Coils_Replacement/53-ENGINE-Spark_Plugs_Ignition_Wires_Coils_Replacement.htm

Time: 2 hours
Tab: $150
Tools: T30 Torx :https://www.pelicanparts.com/Mercedes-Benz/catalog/tools/torx-sockets-bits.htm, 5/8 spark plug socket :https://www.pelicanparts.com/Mercedes-Benz/catalog/tools/sockets-ratchets-drive.htm, torque wrench
Applicable Models: Mercedes-Benz W211 (2003-09) :https://www.pelicanparts.com/catalog/SuperCat/W211_catalog.htm
Parts Required: Spark plugs :https://www.pelicanparts.com/cgi-bin/supertech/catalog.cgi?action=frameset&return-url=/cgi-bin/supertech/catalog.cgi%3Faction%3Dframeback%26page%3D2590&catalog-url=https%3A%2F%2Fwww.pelicanparts.com%2Fcatalog%2FSuperCat%2F3827%2FMBZ_3827_ELIGNT_pg1.htm%23item1, ignitions coils :https://www.pelicanparts.com/cgi-bin/supertech/catalog.cgi?action=frameset&return-url=/cgi-bin/supertech/catalog.cgi%3Faction%3Dframeback%26page%3D2590&catalog-url=https%3A%2F%2Fwww.pelicanparts.com%2Fcatalog%2FSuperCat%2F3827%2FMBZ_3827_BASTUN_pg2.htm%23item6, ignition wire set :https://www.pelicanparts.com/cgi-bin/supertech/catalog.cgi?action=frameset&return-url=/cgi-bin/supertech/catalog.cgi%3Faction%3Dframeback%26page%3D2590&catalog-url=https%3A%2F%2Fwww.pelicanparts.com%2Fcatalog%2FSuperCat%2F3827%2FMBZ_3827_BASTUN_pg1.htm%23item4
Hot Tip: Work with a cool engine
Performance Gain: Engine runs well
Complementary Modification: Replace ignition wires

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