How to replace the spark plugs - Mercedes S550 - m278 | 2014 - 2017 | change spark plugs 

I own a S550 W222 and this is the BEST, most comprehensive and detailed video I've seen on how to change the spark plugs. GREAT job Jose. You are to be highly commended. Your attention to detail is outstanding. This video was / is very helpful. A big thank you!

Very helpful - just changed coil pack causing misfire on my S550 with your instructions. Thank You!

youre a great teacher, very detailed and easy to understand. i will attempt this soon. thank you

Working on my 16' C217 550. Very informative DIY vid, thank you & keep up the great work!

Thank you. Very easy to follow you. I have a 2014 e550. Looks just like my engine.

Best video I have found on RU-vid covering this process. I have an E550 but it has the same engine...

You make it look so easy!

Excellent presentation

Great video very helpful thank you

Great video

Wow gracias por tu ayuda😮

Excellent

Great video! Do you have a cylinder diagram for the w222?

Hi Do you have a video on how to clean the throttle body for the same car? Thank you

Great video What kind of dressing you use on your engine covers they look clean

At what mileage do you change spark plugs? Good video. Thanks for sharing

Jose, some mechaniks make big deal about indexing direction of those plugs. What you think about ? Thank You .

How bad is it if there is slight oil on the spark or in the cylinder? On my old 09 s550 there was one cylinder that had some oil bit it never gave any issues. I have now at 13 s550 and Ill be doing the plugs shorty as they are due. Cars has 65k miles. Im got the bosch triple plats plugs since that is the last set I got for the old 550 and had no issues.

Perfect job! Please keep sharing other maintenance/repairs with us. There not many videos of M278 out there. At what kilometers you have changed spark plugs?

Great video, will be trying to do it myself. Do you recommend a 9/16in or 5/8 magnet extension plug? Thanks!

I have a 2015 s 550 it says cylinder 1 misfire. Should I change cylinder 1 or all eight plugs and coils

So many missed opportunities by MB to put a supercharger in the middle 😂

2015 Mercedes Benz S550 4 Matic- So I am changing the spark plugs, air filters and batteries. So far the batteries and the air filters are great. Thanks for your detailed instructions. However, the spark plugs are a different story. First, I have to use two different size E8 sockets to remove the coils due to the limited area to work in. Secondly you need a 14mm 12 point spark plug remover that is only available online. The regular spark plug socket will not work! Thirdly, the light colored grey latch lever that you have to pull out and press down to remove the electrical connector housing from the ignition coil is very delicate. Maybe mine was dry rotted (my car is 9 years old). Two of them broke, but I was able to still press down and push back on the housing to take it off. Upon inspection of the housing that grey latch only make the housing easier to be removed. They all were very difficult to get off and leave you with sore finger tips, lol. I am still waiting on the spark plug socket from Amazon 😊Thank you for the instructions though.

What sockets did you use for the coils?

Hello my scan tool says cylinder 7 misfire we’re is number 7 Then the 2and code says ignition coil G primary secondary circuit can you let me know where these are? Thank you

Hey man just a heads up the w221 12/13’ have the M278. I know you put 2014-2017 . But don’t forget about us man 😂 it’s a great engine I will upgrade but I won’t go to a 223, only a 2017 222

My car is 2012 E550, and very similar to your 2016 S. I made big mistake of washing the engine which was very dusty. Apparently, water settled around the spark plugs and caused a major random misfiring problem. After following easiest procedures to isolate the problem, I am now in the process of removing the coils and spark plugs which are showing corrosion effects of the water settling around the plugs from the washing of the engine. I had extreme difficulty removing the plug connectors from every one of the 8 plugs. Actually had to destroy each one in order to break them loose from the plugs. I even made the mistake of trying to spray a lube into the spark plug hole to hopefully cause the boot to break loose. That only further complicated my problem by causing the boot to separate into multiple sections. Two lessons learned with this design engine. Never spray water on it to wash and never spray liquid lube into spark plug hole to help rubber connector boot to release. I haven’t owned this particular car for very long and don’t know the maintenance history. I realize that I took a big gamble purchasing this 2012 E550 showing 180,000 miles and no maintenance history, but the unusual impressive condition inside and out along with the performance of the drive chain persuaded me to gamble and purchase it. Yes, I have learned much negative about this engine that’s kinda scary, but so far, I’ve got an open mind about learning everything out there about how to properly maintain the engine, hopefully for many more miles. I totally appreciate your detailed video of changing the spark plugs on your S series and anxious to learn from any other videos that you provide about the M278 engine.

😎👍

where did you get the fender protectors

Mercedes says swap around 100k - 120k. I do feel car a little sluggish but when i pulled a plug out it looked fine? Should i still replace at 85k. Not sure if anyone did it before me. I bought car at 55k now im at 85k.

How much time does the change take?

Where are you located?

Way easier the doing spark plugs on a m276 2013 e350 ima trade this in for a e550

Absolute hell. I can’t reach the backmost screws to loosen the coils. On top of that, whoever worked on my spark plugs last, stripped one of my screws. Absolute disaster.

You better read this: The W222 engine is worst engine ever built by Mercedes Benz MY2013 - MY 2016 or 2013 to 2020 S class V 8 “The exhaust valve assembly might not work properly etc. this means you need a new Cylinder head or both! The Water thermostat open at 217 Fahrenheit, Water Boil at 212 Fahrenheit you must remove the coolant to clean the coolant back flow. The temperature reading in the car display never goes aver 200 Fahrenheit I check the engine temperature was 217 to 225 Fahrenheit without any fan coming on (Back flow) the manual warning on page 295 if the coolant temperature is above 257 Fahrenheit do not drive. The rigged the software “wrote a CALL” like they did in the Mercedes Benz Diesel Engine. The exhaust valve problem trigger “Fuel system monitor not completed” 17 states in the USA DO NOT PASS inspection to drive the car “Done” and you cannot do anything about.

nothing special

You have to mark spark plugs an make sure they point right direction. Fail to do so will damage your engine. Research Mercedes spark plugs indexing. All Mercedes turbo engines spark plugs have to point directly to injectors. This video is misleading.