Plug Change 2014 E350 Sedan M276
#1
Junior Member
Thread Starter
Plug Change 2014 E350 Sedan M276
Car has just over 61k miles and is due for a spark plug change. I've had the plugs on the shelf for several weeks, waiting to get motivated and warm weather. Today was the day, I was motivated after a successful front brake pad replacement completed yesterday afternoon. So let me start by saying it is possible to change the plugs without removing the intake manifold, I don't know if it saves time but it is possible.
I followed a very detailed pdf (there are links in several threads) where a guy did the plug change on the same engine in his SLK without removing the intake. Since I had the same engine I expected I could do it too.
The passenger side is easy once you remove the air filter box (clic pliers to release the clamp). You have to really pull hard on the COPs to get them to release. Make sure to torque the plugs to 17 ft/lbs.
The driver side is a bear. There was a difference in the design of the brackets on my car vs. the SLK and it took me an extra hour to figure out how to remove the bracket. Once the bracket was removed the plugs were accessible and easy to change.
Total time was 3.5 hours and I did not rush, took several breaks. Cost for my materials was about $70 for the Bosch plugs, $15 for clic pliers (Amazon), $15 for star socket set (Amazon), I already had a good torque wrench. People say the dealer charges about $800 for a plug change.
I'm not recommending this as an easy job, I would say it is moderately difficult and you need a good set of tools. But it can be done it you have some experience and confidence.
I found very little information on the internet regarding the 2014 E350 sedan as related to plugs, brakes, shocks and struts. I'm figuring it out as I go.
Next, Bilstein shocks and struts are on the way.
I followed a very detailed pdf (there are links in several threads) where a guy did the plug change on the same engine in his SLK without removing the intake. Since I had the same engine I expected I could do it too.
The passenger side is easy once you remove the air filter box (clic pliers to release the clamp). You have to really pull hard on the COPs to get them to release. Make sure to torque the plugs to 17 ft/lbs.
The driver side is a bear. There was a difference in the design of the brackets on my car vs. the SLK and it took me an extra hour to figure out how to remove the bracket. Once the bracket was removed the plugs were accessible and easy to change.
Total time was 3.5 hours and I did not rush, took several breaks. Cost for my materials was about $70 for the Bosch plugs, $15 for clic pliers (Amazon), $15 for star socket set (Amazon), I already had a good torque wrench. People say the dealer charges about $800 for a plug change.
I'm not recommending this as an easy job, I would say it is moderately difficult and you need a good set of tools. But it can be done it you have some experience and confidence.
I found very little information on the internet regarding the 2014 E350 sedan as related to plugs, brakes, shocks and struts. I'm figuring it out as I go.
Next, Bilstein shocks and struts are on the way.
#3
Junior Member
Thread Starter
Based on what I've read about removing the intake, there are a lot of hoses that need to be disconnected, throttle body controls, etc. And you have to replace the gaskets/seals on the intake runners. I've read some of the connections are back by the firewall and hard to get to. One person reported they had a throttle body malfunction light afterwards. So it might be 6 of one and half dozen of the other on which way to go. I felt more comfortable not removing the intake..so I went that direction.
The following 2 users liked this post by bumparker:
Jabberwock (03-02-2018),
rafael.assis (03-06-2020)
#4
Car has just over 61k miles and is due for a spark plug change. I've had the plugs on the shelf for several weeks, waiting to get motivated and warm weather. Today was the day, I was motivated after a successful front brake pad replacement completed yesterday afternoon. So let me start by saying it is possible to change the plugs without removing the intake manifold, I don't know if it saves time but it is possible.
I followed a very detailed pdf (there are links in several threads) where a guy did the plug change on the same engine in his SLK without removing the intake. Since I had the same engine I expected I could do it too.
The passenger side is easy once you remove the air filter box (clic pliers to release the clamp). You have to really pull hard on the COPs to get them to release. Make sure to torque the plugs to 17 ft/lbs.
The driver side is a bear. There was a difference in the design of the brackets on my car vs. the SLK and it took me an extra hour to figure out how to remove the bracket. Once the bracket was removed the plugs were accessible and easy to change.
Total time was 3.5 hours and I did not rush, took several breaks. Cost for my materials was about $70 for the Bosch plugs, $15 for clic pliers (Amazon), $15 for star socket set (Amazon), I already had a good torque wrench. People say the dealer charges about $800 for a plug change.
I'm not recommending this as an easy job, I would say it is moderately difficult and you need a good set of tools. But it can be done it you have some experience and confidence.
I found very little information on the internet regarding the 2014 E350 sedan as related to plugs, brakes, shocks and struts. I'm figuring it out as I go.
Next, Bilstein shocks and struts are on the way.
I followed a very detailed pdf (there are links in several threads) where a guy did the plug change on the same engine in his SLK without removing the intake. Since I had the same engine I expected I could do it too.
The passenger side is easy once you remove the air filter box (clic pliers to release the clamp). You have to really pull hard on the COPs to get them to release. Make sure to torque the plugs to 17 ft/lbs.
The driver side is a bear. There was a difference in the design of the brackets on my car vs. the SLK and it took me an extra hour to figure out how to remove the bracket. Once the bracket was removed the plugs were accessible and easy to change.
Total time was 3.5 hours and I did not rush, took several breaks. Cost for my materials was about $70 for the Bosch plugs, $15 for clic pliers (Amazon), $15 for star socket set (Amazon), I already had a good torque wrench. People say the dealer charges about $800 for a plug change.
I'm not recommending this as an easy job, I would say it is moderately difficult and you need a good set of tools. But it can be done it you have some experience and confidence.
I found very little information on the internet regarding the 2014 E350 sedan as related to plugs, brakes, shocks and struts. I'm figuring it out as I go.
Next, Bilstein shocks and struts are on the way.
Thanks in advance!
#5
Junior Member
Thread Starter
I used the Bosch Iridium plugs, the number on the box zr6sii3320, the box also shows the torque spec of 23nm of 17 ft/lb. The plugs are identical to the ones I removed. The plugs index by using the torque spec, they have a special one use washer that indexes the plug at 17 ft lb of torque. I was careful to torque the plugs because of this.
The following users liked this post:
Touringman (03-02-2018)
The following users liked this post:
Touringman (03-02-2018)
#7
I used the Bosch Iridium plugs, the number on the box zr6sii3320, the box also shows the torque spec of 23nm of 17 ft/lb. The plugs are identical to the ones I removed. The plugs index by using the torque spec, they have a special one use washer that indexes the plug at 17 ft lb of torque. I was careful to torque the plugs because of this.
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#8
Junior Member
Thread Starter
No, but what I've read said not to apply anything to the treads of the new plugs as they come with a factory coating. The plugs all treaded in easily, I put them in by hand initially. The plugs are really thin and I forgot to mention you need a special thin wall spark plug socket
#10
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2014 E350 4M Diamond Silver
https://www.ebay.com/itm/Mercedes-Be...item1a4ef61963
or a 10-pack from amazon:
Are these ebay ones safe to buy? Do you think we can get them for a cheaper price?
I'm at 62k and talking to my SA about bringing my own spark plugs.
or a 10-pack from amazon:
Are these ebay ones safe to buy? Do you think we can get them for a cheaper price?
I'm at 62k and talking to my SA about bringing my own spark plugs.