tarmacshredder

Plenty written here on the subject and we have all paid big money for these things, "my question has anyone actually taken one apart or tried to fault find the issue, might be a more cost effective solution to these woes?.

freestylebiker3

I wish I knew how also. Because I just sent my coil rail to 4-mercedes.com. They are v12 specialist who can repair these coils with ease....

biker349

how much to rebuild?

freestylebiker3

Around $260 to rebuild a coil rail

Oxygen

I not sure if I would trust a $260 rebuild coil... I feel like they wouldn't last too long.

My S65 blew the driver's side coil and I went with an OEM replacement... took about 50 minutes to install and all was great. I think the OEM coils last about 50K miles or so. Mine blew it at around 22K miles. Not sure why...

I'd like to replace all the spark plugs soon.

freestylebiker3

Ok this 4-mercedes place is B/S. Do not send anything to them. I regret sending my stuff to them..

1995E320Cab

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What happened ?

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freestylebiker3

after sending my parts in.. the shop never called me when they got my parts. so they never knew what to do with them.. so after 2 days i called them and spoke to a lady, which could not find my parts.. after 10 min she found them and told me some one will call you tomorrow for a update.. so 3 days later still no call.. i call them back and speak to the same lady and she ask for my number so someone can call me back ASAP.. well 2 day goes by still no call.. i call back 5 times and no responce. the next day they answer and i speak to a guy and explane whats going on and they tell me they dont know where my parts are.. so im put on hold and they find my parts again and ask me what is wrong with my parts... they have my parts for 1 week and they still dont know what to do with it.. so i told the guy i want them fix ect ect.. and he promised me he will call me tomorrow for a update.. 4 days later no calll back so i called them today pissed off and told them that they pretty much suck and i wasted my time with them and for them to send my parts back... 2 weeks goes by and they still havent touched my parts... and the funny thing is today the same guy asked me, "well how much money did you want for your parts" how much money im not selling my parts i told you i need them fix..... so i got pissed and told them just send it back, so his responce was "ok i will. call tomorrow for tracking number"


these guys suck big time!!!!!!! i wish i saw there google and yelp review before i sent my parts

tarmacshredder

Yes not a lot of good feedback regarding these people, trying to get a old unit to let my Electronic boffin of a Uncle here in the UK take a look see if he can throw some light on these things, he says there not that complicated and will be down to a few dimes worth of semiconductor or resistor failing, it;s just finding it, keep you posted.

04S600AMG

People, there really isn't much to a coilpack. I haven't torn one of these specific units apart yet however I have nearly 30 years of Electronic Systems maintenance and repair experience not to mention I have personally rebuilt about every type of engine, transmission and mechanical unit in a vehicle. Just by looking at them I can conclude the coil pack either batch fires all 6 cylinders at once each time the computer says one of those cylinders is at it's TDC or there is some kind of logic board inside the coilpack which takes commands from the computer to send the spark to a specific cylinder. If these are batch fire coilpacks then it greatly simplifies troubleshooting and fault isolation. However if there is some logic board within the coilpack it could get complicated, not impossible, just complicated. The coil itself is NOT, or at least should not be an expensive item. There really isn't much technology in an ignition coil. The grade of the materials may drive up the cost but not nearly to these rediculous levels. I must say that I am shocked that some of the more prevalent aftermarket coil companies such as MSD or Accell haven't tried to capitalize on this.

Speedriven1

Well I have taken a couple of the coil packs apart and nothing really stands out as a common point of failure. Keep in mind that on the M275 engine the coilpacks do more than just fire a spark plug. They are deffinetly not batch fire. Matter of fact not sure if you are aware but this particualr motor has 2 spark plugs per cylinder and the coil will fire the plugs at the same time or up to 14degrees apart. Also more importantly the coil pack has circuitry in it that monitors combustion temperature to control knock before the knock sensors even pick it up. M137 engine which use same coil packs did not even have a knock sensor, the ecu strictly used the coilpack inputs to determine knock. This is why these cars are so sensitive to fuel grade and pick up tremendous power from race gas without the need for a high octane tune.

Benz-O-Rama

WOW, Jo! This is Grade-A information. I never would've thought that the coil packs do so much in this car. Thanks for the info, and education. Partially explains the price on these packs....

mkhurley

I agree completely, I cracked open the one I had replaced and there was nothing that stood out as obvious unless the tubes are rotated even slightly. A typical coil this is not....pic below.

When I had you all upgrade my ECU/TCU we discussed that a coil might follow soon, I had already had the drivers side replaced, well last night the passenger side started acting up. I'm heading to Hawaii next weekend so I'll deal with it when I get back.....

NEMES1S

so to remove the coil pack, did you use an extra set of hands to pull it straight off or some sort of tool? My big fear is with the size of it, I don't want to have any flex on the center and damage the board. I'm also looking for input on plugs, I think I bought half of the correct size NGK's on an ebay auction, but don't know if I want to go that route or OEM

mkhurley

I was told by a tech I spoke with that the easiest way was to wedge it off a little at a time between the valve cover bolts and the coilpack, once it's out about 1/4" or so you should be able to just pull it right out. Worked fine for me.....

I used NGK's, same numbers as the stock MB plugs.....IFR6Q-G

NEMES1S

pretty sure those are the plugs I have as well, glad to hear I didn't waste money on them. got them for around 3.xx a plug shipped from amazon, they didn't have all 24 available at the time though

NCE500

I did my own plugs last Summer; pulling the packs entails patience, ie remove everything on top of them, then everything connected to them, wires, cable ties etc. Then gently pry up one end, I started at the front of engine on both sides, and once it is loose, gradually work your way back until the entire pack is loose. Both came off and went back on without mishap.

Driver side was harder than passenger side due to fuel line etc., but neither was insurmountable with a little patience. I also used the OEM replacement plugs

Very educational info about octane and the packs. I will try some high octane fuel in the Spring for a little fun.

1995E320Cab

Has anyone tried this?

What grade would we need to use to tell a difference ?

Also how fast does it adjust to the higher grade fuel ?

04S600AMG

So what is the latest on these coil packs and the possibility of repairing them. If anybody out there has a failed unit I would be willing to give it a once over. I'm a retired U.S. Navy Radar Electronics technician and I now work for a major Aerospace company. If I can't figure these things out I'm pretty sure I can find somebody here that can. Wouldn't you rather replace a few dollars in components than spend over $1000 each time these things go out? Let me know.

Sgt. Schultz

someone on the W220 forum repaired theirs and it worked - briefly

something like a month or so until failed again

I've got a passenger bank unit you could have for shipping cost, the last spark plug 'boot is missing due to my hamfistedness and it had failed internally prior to my hamfistedness.

Interesting data on the sophistication of these units - helps explain the astronomical sums they command 8-/. Thanks for sharing that detail...

NRL

Anyone know how to test out the coil pack?
I think the hard part is to confirm they are working well at higher voltage simulating wide open throttle..
For now Im wondering if there is anything can be tested out with a multimeter.


I'm Putting on extra dielectric grease in and around those red insulators and some in coil holes..

TheGrandmaDee

Hello:

I THINK I got a batch of bad gas. The car started going in and out of the normal high performance mode and ran rough at times. A couple of times it stalled. I filled up with 1/3 tank of Premium Ultra Sunoco and the shaking stopped and car is drivable. NO performance though. I PULLED the driver's side plug on the coil pack after getting codes for 7,8,9,10,11,12 misfiring.

The car ran (!) and idled smoothly on just the right bank!

I saw a post about "how long does it take" to see results from X high octane fuel, but no answer... my question being, will crappy gas cause a pack / side to not function? The car seems to be running better and better and I am ready to fill it with X Prem Sunoco.

Is it possible that the gas was SO bad the coil pack would not respond to it?

Will O2 sensors (2 per bank?) shut down a coil pack?

Is the Thruway / Ecconomy mode the same (shutting down 1 bank)?

Are the Coil Packs FUSED?

I VERY much appreciate your answers. Thanks. Tom