newton22

Mercedes needs to do more research. Stock plugs burn a tad too hot. This is why many people report good things about switching to Iridium plugs, specifically the Denso IK16, which is colder.



At 30,000 miles. I'm going Denso IK16 soon, and would advise everyone else to do so when changing their plugs.

1phd1jd

I would hate to think how much a spark plug job would cost at the dealership................

schwarz

newton22, is it possible to change the spark plugs by yourself instead of bringing the car to the dealership?

newton22

Of course. It's what I am doing, but it takes a lot longer than changing spark plugs in other conventional cars (one plug/cyl). I don't even know if you can insist the dealer to use non OEM plugs.

Regardless, I'm pretty sure Mercedes engine dynos these motors with the Bosch plugs. So its perfectly possible for our engines to recover and GAIN power from using other plugs.

By the way schwarz, your S has a great stance! And its weird how our sig pics both depict the car at the same angle.

schwarz

i think i might have to tinker with my car a little bit to do it myself then. hehe.

about the sig, thanks for your comment. and i've seen your sig but when i put mine on i just realised how much it look like yours. :p let me know if you mind so i can change it.

bamberger_1

@Newton 22
is the picture really showing a W220 spark plug??? Mine look completely different. I have the Platnium plugs, which are required for this engine, and they looked still quiet ok, when I changed them after 50,000 mls.

kjb55

Your spark plug actually looks quite good with a normal operating result. The burn pattern and operating tempurature are normal, with very little electrode erosion.

Attached are untouched photos of spark plugs that are subjected to too much heat.

newton22

Those are pictures of pretty extreme overheating. Though my spark plugs are fine, they're just a bit hot. Spark plugs a bit hot can slightly decrease mpg and power, so the motor isn't performing optimally.

Yup, the stock Bosch plugs. I have a year 2000. Not sure if Mercedes uses different ones throughout the w220 production line.

No, not at all. Your W220 looks better than mine.

Oxygen

I just bought 16 IK16 Spark Plugs for $140.00 including shipping.

Here is a diagram for those of you who want to know how to pull yours you.

What if I don't have a torque wrench... is it a big deal?

PA55AMG

Those plugs are not indicating hot at all for UNLEADED fuel.

In fact, it looks as though you just shut the car off , as opposed to doing a proper plug chop.

newton22

A torque wrench is recommended. Though if you have a good feel for a regular rachet, just tighten it enough in there. Where did you get 16 for $140?

Oxygen

http://cgi.ebay.com/ebaymotors/ws/eB...tem=8076539245

newton22

Good deal. Let me know if you feel any kind of difference after putting them in.

Oxygen

I want the AMG 200MPH speedo!

http://www.amgkit.com/EBMS/Catalog/P...ProductId=4431

StapleGun

I used the Denso's, they're great!!! See my post, it's a two hour DIY job, see #8 on this post LINK

johnlovescar

If your car take 16 spark plugs. Then I am assuming that my V12 will require 24 spark plugs, when I do have to change them (is this right)? How hard is it to change the spark plugs on the V12? I was told they are MUCH HARDER than the V8 (any help?).

Thanks.....

my06clk

I'm not a fan of one plug over the other.. But, I will say that there could be a million reason why spark plugs look certain ways.

1. fuel quality
2. mixture control
3. driving characteristics
4. Engine...

these are a few but how can you say the plug you show in the pic is hot?

by what degree or percentage for that engine setup?

I'd say that if a plug is designed to go 100K between changes and you need to change them at 30K you should investigate possible engine anomolies.

there are a lot of factors besides the maker of a plug that determine what is "optimal" for an engines performance.

Saying that is just like saying that all you need to do to get more Hp is to add a certain type of air filter and you are all of a sudden in the high performance catagory...

You must consider all of the factors involved..

Normally in the Aviation world ( where I'm from ) in the land of zero tolerance high performance engines, the spark plug is examined because it reveals tell tell signs of what is going on internally with the engine so you know what needs to be addressed. Not to be misconstrued as " well look at these things, I think its time to find a new brand of plug ".

MBVzla

I need Help, how I can take out the electronic speed limit?
I changed for Copper ACCEL because the Nitrous system, and becarefull on coil pack removal the tubes can split and wont going back easy

AsianML

Probably because of a tighter engine bay, but what do I know.

S500 Man

http://cgi.ebay.com/ebaymotors/4-DEN...Q5fAccessories


would ik20 be any good?

DTMLGND

This link worked for me!!
I used Bosch 7422's. My old plugs looked pretty good actually. Mileage is 86K.
Took about 4.5 hours taking my time. Snapped one 3/8" drive universal joint half-way through, then switched to 1/2" drive(should have went 1/2"drive from get-go). Did it without removing coil packs!!.

I can tell a difference just in the idle, it is better. Acceleration is nicer as well.

Thanks!

M-bENZ

How ?

Andy

my06clk

There is no law that say's the coil packs MUST be removed. In my case they were only unbolted and rolled out of the way to make removing the plug wires easier. BUT if you can manage to work the plug wire loose and be able to snap it back into place when you install the new plugs, there is no real reason to remove the coil packs.

I can't believe someone dug up a 3 1/2 year old thread to talk about plugs.. why not just make a new post??

DTMLGND

Believe this....Alot people use the 'search' function to find help in DIY or whatever they need. I posted to credit the helpful reference LINK in the thread.

my06clk

As do I. But as you can see by this example, sometimes post take on a life of their own and end up with a lot dialog within the threads not having much to do with the original post.

Sometimes it just makes sense at some point to make fresh thread focused on the subject at hand. Search still works in that case also.