Spark Plug Comparison
MBWorld Fanatic!
Joined: Nov 2007
Posts: 3,681
Likes: 39
From: San Diego
E55
I just ordered the spark plugs (ILFR6A) from amazon. Total was $154.80 delivered to my door. I will be replacing them this weekend. Don't expect it to take more than a couple of hours. I called the stealership just to get an estimate and was quoted below.
Parts: $292.00
Labor: $520.00
Total: $812.00
Not only that, I also ordered the supercharger and the v-belt from primeparts. Cost me total of $88.00 delivered. Dealer quoted $314.00 total.
So if I went with the dealer, the total cost would've been $1126.00. BIG Thanks to mbworld AND the folks that have posted the DIYs, it'll only cost me $242.80 and a few hours on Saturday.
Parts: $292.00
Labor: $520.00
Total: $812.00
Not only that, I also ordered the supercharger and the v-belt from primeparts. Cost me total of $88.00 delivered. Dealer quoted $314.00 total.
So if I went with the dealer, the total cost would've been $1126.00. BIG Thanks to mbworld AND the folks that have posted the DIYs, it'll only cost me $242.80 and a few hours on Saturday.
Senior Member
Joined: Oct 2006
Posts: 300
Likes: 0
just the plugs. People have difference of opinion on wires, but I am not changing mine since they should last a lot longer than the plugs themselves (unless handled incorrectly and not using proper tools) and the manual does not call for them to be changed either.
MBWorld Fanatic!
Joined: Nov 2007
Posts: 1,339
Likes: 11
From: Gulf Coast but not Florida
GLK350, SL63 AMG
Plug wires
No doubt many stealers replace "defective"plug wires rather than performing this venerable procedure.
We used a dab of anti seize on the plug threads and a dab of dielectric grease on the boot wire to plug connection.
Finally, after all this, if you get a misfire try switching spark packs from one cylinder to another. Be careful because the wires and packs have an interchangeability order, they are not all the same. I took a before picture of both banks as well as looking at the diagram on
www.mymercedesparts.com
For a further reference to the M113K engine.
Just some tips. Comment: The spark packs on the m113 and m113k v8 are epoxy sealed and should be quite rugged vs the infamous v12 packs in the turbo environment.
Senior Member
Joined: Oct 2006
Posts: 300
Likes: 0
What we did was unplug the wires from the coil pack and then replug them. This wipes any corrosion buildup on the connection.
No doubt many stealers replace "defective"plug wires rather than performing this venerable procedure.
We used a dab of anti seize on the plug threads and a dab of dielectric grease on the boot wire to plug connection.
Finally, after all this, if you get a misfire try switching spark packs from one cylinder to another. Be careful because the wires and packs have an interchangeability order, they are not all the same. I took a before picture of both banks as well as looking at the diagram on
www.mymercedesparts.com
For a further reference to the M113K engine.
Just some tips. Comment: The spark packs on the m113 and m113k v8 are epoxy sealed and should be quite rugged vs the infamous v12 packs in the turbo environment.
No doubt many stealers replace "defective"plug wires rather than performing this venerable procedure.
We used a dab of anti seize on the plug threads and a dab of dielectric grease on the boot wire to plug connection.
Finally, after all this, if you get a misfire try switching spark packs from one cylinder to another. Be careful because the wires and packs have an interchangeability order, they are not all the same. I took a before picture of both banks as well as looking at the diagram on
www.mymercedesparts.com
For a further reference to the M113K engine.
Just some tips. Comment: The spark packs on the m113 and m113k v8 are epoxy sealed and should be quite rugged vs the infamous v12 packs in the turbo environment.
Super Member
Joined: Jan 2007
Posts: 852
Likes: 3
From: Sleepy Hollow, IL
65 Chevelle Wagon w/ C5 frame, 08 ML63, 04 S600, 04 E55,(sold) 00 ML55,(sold) 98 C43-55K Swap
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MBWorld Fanatic!
Joined: Dec 2011
Posts: 4,066
Likes: 37
From: Folsom, CA
2005 E55 AMG
here's a good pictorial of what happens to plugs
http://www.ngksparkplugs.com/tech_su...qs/faqread.asp
Super Member
Joined: Jan 2012
Posts: 526
Likes: 4
From: ChiTown
e46 m3, w211 e55
MBWorld Fanatic!
Joined: Mar 2011
Posts: 1,879
Likes: 22
From: Orange County, CA.
one car at a time
You should get a wideband installed (Zeitronix and Innovate are the leaders) or find someone with a portable wideband and drive around and log....I am sure you'll see the box tune is very conservative (rich). Although the plugs don't look bad, they do look like you are running a tad rich (I have seen much worse).
Senior Member
Joined: Mar 2016
Posts: 432
Likes: 34
From: Sandy Eggo
2006 CLS55
2006 cls500 manual says .039"
hope this helps clarify
Junior Member
Joined: Aug 2008
Posts: 48
Likes: 0
From: NoVA
2005 E55
Regarding gaps, my 2005 E55 manual says 0.031" or 0.8 mm.
Based on my small sample of NGKs, I recommend checking the gaps on new plugs rather than assuming they are all accurately set at a predetermined gap. I just bought and gapped 18 of the NGK LFR6AIX-11 plugs. Yes, it's a small sample, but the gaps were definitely not consistent across the batch. Three of the 18 were at the gap I was setting (I used 0.032), and the rest were closer to 0.040.
Based on my small sample of NGKs, I recommend checking the gaps on new plugs rather than assuming they are all accurately set at a predetermined gap. I just bought and gapped 18 of the NGK LFR6AIX-11 plugs. Yes, it's a small sample, but the gaps were definitely not consistent across the batch. Three of the 18 were at the gap I was setting (I used 0.032), and the rest were closer to 0.040.
Super Member
Joined: Nov 2017
Posts: 930
Likes: 166
From: Virginia
N/A
Super Member
Joined: Mar 2017
Posts: 770
Likes: 71
From: Utah
2003 Mercedes E55 AMG
But maybe some of our cars dont like the colder plugs mine loves em and it drives, idles, and cruises exactly like it did with the stockers heck even my mileage is same.
Super Member
Joined: Jan 2017
Posts: 860
Likes: 80
From: Christchurch, New Zealand
CLS55
My daily commute is like 1.5 miles (5min in traffick) from home to work and back. I don't really get all the way up to op temp and I think this contributes to my plugs fouling a little. The idle for me really smooths up when I've been beating on it, until then its a bit rough. It could be my injectors though? I am putting a new set of 1 step colders in. I have one bank done last night the other bank today and I'll let you guys know if its smoother from the change. Everything else, MAP, IAT, o2, coil packs and wires are all replaced within the last couple of years. My thought is if you are on stock you will have problems with plugs fouling up and slightly rougher idle. NGK recommend going to one sop colder when increasing power by 75-150 hp if I remember correctly.
You must be fast to get all 16 plugs done in an hour! I spent a good hour getting one side done, but I didn't copper grease the plugs last time so I have to turn it like 7 times before it starts loosening up and turning easily :P. Also I don't have a good extension length and have to work around with too short and too long
.
You must be fast to get all 16 plugs done in an hour! I spent a good hour getting one side done, but I didn't copper grease the plugs last time so I have to turn it like 7 times before it starts loosening up and turning easily :P. Also I don't have a good extension length and have to work around with too short and too long
.
Super Member
Joined: Jan 2017
Posts: 860
Likes: 80
From: Christchurch, New Zealand
CLS55
I find my idle is more temperamental with the colder plugs I think it is because my daily commute to work is like 2.5km and car barely reaches OP temp. I do my best to smash the pedal on longer drives but I think the plugs foul up quicker, figure since hes stock no point changing to get potential headaches for no real benefit ngk said every 75-150hp go one step colder if I remember.
Maybe my idle is the injectors we will see I have new plugs going in now did one bank last night do the other bank tonight.
You must be fast to get them done in an hour, I have to struggle against the plug for like 7 full rotations before it starts easing up on me. Probably should put some copper Q1qQQwzQqqqqqwww²grea222w3w33a2qq in grease on. I also am a bit short on appropriate extensions and either have too short or long so am working around that lol
Maybe my idle is the injectors we will see I have new plugs going in now did one bank last night do the other bank tonight.
You must be fast to get them done in an hour, I have to struggle against the plug for like 7 full rotations before it starts easing up on me. Probably should put some copper Q1qQQwzQqqqqqwww²grea222w3w33a2qq in grease on. I also am a bit short on appropriate extensions and either have too short or long so am working around that lol
