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M275 V12 Bi-Turbo Platform Technical discussion relating to models sharing the M275 V12 Bi-Turbo (V12 TT). Including SL600, SL65 AMG, CL600, CL65 AMG, S600, S65 AMG.
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Misfiring

 
Old 12-23-2014, 10:02 PM
  #101  
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if you search online i believe you will be able to find an accelerator pedal for less than a few hundred dollars. possibly oemdiscount.com
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Old 03-13-2015, 02:30 PM
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04 sl 600
I have the same issue

Originally Posted by Oxygen View Post
Interesting, thanks for the great information.

I have a spare ignition module I may try out... right now I misfire on the passenger side above 4K RPM and while under boost.

Same story as always... CEL, limp mode, restart, back to 12.
I have the same issue what was ur fix
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Old 06-19-2015, 11:51 PM
  #103  
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2005 SL600, 2016 ES300h, 2012 Hayabusa
Well my warranty ran out 11 days ago so now my car throws p0300. I did my own plugs 3 years ago but didn't do the insulators so I plan to inspect it all this weekend. Only things to change recently were today I was running errands and got closer to E than I normally go and the oil was changed about 500 miles ago.
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Old 06-19-2015, 11:52 PM
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It would rock if someone was able to make a thread on how to test these three fairly spendy parts
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Old 06-21-2015, 11:22 AM
  #105  
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And on my S65 The hole row 7-12 shut down. Found some oil in one plug hole. Cleaned it all out and replaced the plugs and installed a new coilpack. After that is run great for about 2 hours. I Went into a parkinglot and sat on idle for about 2 minutes and it shut down and after that I tried to start and it Went into limpmode and Check Engine is on again. Now when I reset it with star diagnose it missfires right away when I start it and goes back in limp and now it also sometimes give me a fault code on the Voltage converter. ECI. I will replace it this week to see if that fix the problem. Otherwise I am totally lost.

Last edited by Chris The Swede; 06-21-2015 at 11:24 AM.
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Old 06-21-2015, 11:55 AM
  #106  
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W212 E63 wagon, ML350, GLK 350
Some pic of Star diagnose.
Attached Thumbnails Misfiring-2015-06-20-16.02.22.jpg   Misfiring-2015-06-20-16.03.00.jpg  
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Old 06-22-2015, 10:10 PM
  #107  
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For everyone's info I had misfires right after I changed the plugs. It ended up being that the gap was too wide and would misfire under boost. I tightened the gap up to the small end of the spec and have never had a misfire since. My mistake for not checking the gap prior to the initial install.
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Old 06-23-2015, 07:22 AM
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What gap?
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Old 06-23-2015, 03:17 PM
  #109  
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I believe the factory spark plug gap is .7mm or about 0.027 inches. The plugs that I was using out of the box were a bit over .040 inch and would not fire across the gap at high boost. Make sure to check before installation.

For reference I was using the Autolite iridiums.

Last edited by Flight Test; 06-23-2015 at 08:51 PM. Reason: Mislabeled .040 as mm instead of inches.
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Old 06-27-2015, 01:22 PM
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Has anyone tried taking the top off of the coil pack and testing out what fried? I know you can get MOSFETs for reasonable money and solder them in, but I'm not sure if that is what gets cooked in these things to make them randomly die off.
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Old 06-27-2015, 03:50 PM
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They are totaly glued..It often breakes when trying. I changed the ECI now and so far it works.
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Old 06-28-2015, 07:54 AM
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Originally Posted by NEMES1S View Post
Has anyone tried taking the top off of the coil pack and testing out what fried? I know you can get MOSFETs for reasonable money and solder them in, but I'm not sure if that is what gets cooked in these things to make them randomly die off.
Howard reported that in his maintenance thread. He fixed his coil pack and I believe its still running strong.

https://mbworld.org/forums/s-class-w...2003-s600.html

1000 posts - yahoo! Now I'm officially a fanatic.

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Old 06-28-2015, 10:40 PM
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1000 posts - yahoo! Now I'm officially a fanatic.

Nick[/QUOTE]

Congrats Nick!!

and I will be the first to ask a lots of questions about this Coil Pack issues tomorrow after taken some Pic.

Last edited by fisherman123; 06-29-2015 at 12:23 AM.
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Old 06-30-2015, 03:41 PM
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Yea,I too have a problem with my Left Coil pack.
Miss fires on all six,codes are P0300(random) and 307-312.
It runs fine on a cold start for about two minutes and that's that, check engine light comes on and miss fire badly. I have to admit that besides regular oil changes and top up with oil in between I haven't do anything to maintain it.

Thanks to the Forum here with another DIY instruction to remove and replace the coil pack, I was able to pull the pack out with minimum effort.
I attached some Pic below,
Coil pack is nice and clean by only looking at it, No arcing/burn marks/separation on the tube. too bad there is noway to test it out?
Red insulate boots are kind dry but not cracking.
Spark plugs are something else, I bet you guys have never seen anything this bad.
I did notice that I need a Valve cove gasket replacement as well,you'll see it in the photo, my question is do you think it's because the Valve cover leaking and oil drips down then slowly ruined the plugs and coil pack? but all the Red boots are clean without any trace of oil. Some Plugs threads are covered with oil, I don't know if it's just the oil just sitting/collected outside the plug and when I unscrew them and oil got on them?


Attached Thumbnails Misfiring-v12-coil-pack-007.jpg   Misfiring-v12-coil-pack-008.jpg   Misfiring-v12-coil-pack-009.jpg  

Last edited by fisherman123; 06-30-2015 at 04:25 PM.
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Old 06-30-2015, 03:50 PM
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04 S600 12 Honda

a little closeup





Attached Thumbnails Misfiring-v12-coil-pack-012.jpg   Misfiring-v12-coil-pack-011.jpg   Misfiring-v12-coil-pack-014.jpg   Misfiring-v12-coil-pack-015.jpg  

Last edited by fisherman123; 06-30-2015 at 04:51 PM.
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Old 06-30-2015, 04:55 PM
  #116  
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it's possible it's your ignition module. had similar problem and the ignition module solved it. good luck.
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Old 06-30-2015, 05:32 PM
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04 S600 12 Honda
Thanks Biker! Sorry,My bad, I forgot to mention I already swapped out mine with a known good one from my Indy and that didn't help,at this point he thinks it's the pack and of course he doesn't have an extra pack for me to play with.

Last edited by fisherman123; 06-30-2015 at 05:51 PM.
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Old 08-28-2018, 01:04 AM
  #118  
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Digging up this thread, my turn

Had misfire, scanned the code and got Cylinder 3 and 4 misfiring. Turned off the car, turned it back on and all was normal, this was 2 weeks ago. Drove 100 miles in two weeks, today, drove from home to the gym, hit the weights, came back out and started the car and had a misfire, same cylinders, 3 and 4. Turned off the car, turned back on and back to normal.

Can we for sure say it's the coil packs?
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Old 08-28-2018, 08:54 AM
  #119  
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See previous posts above ......Could also be ignition transformer module that sits on top of engine - $1500. It also sounds like coil is shot. Are your coils upgraded to new part number? Once I changed the ignition transformer module, all plugs and both coils my problem was solved for 2 years then I replaced them all again then sold the car and gave up on the V-12.....this is an update from post above...was disappointed to sell the car...got 40k at Car max when MB would only give me 30k several years ago......drove it a total of 5 years - 30k miles and lost 5k a year in depreciation and probably another 5k in repairs...expensive car to maintain - also motor mounts were shot which required engine out and I gave up - Car needed about 12k in out of warranty repairs to keep it on the road after coil debacles.....

At 58k miles sold it - differential discs shot, another ABC struts failing and ABC hydraulic lines having to be replaced because pressure constantly exceeded the specs MB designed in weak lines....needless to say I learned lots about AMG - will not buy another - went Porsche GT Cars....

Last edited by abiazis; 08-28-2018 at 09:07 AM.
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Old 08-28-2018, 11:01 PM
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Originally Posted by abiazis View Post
See previous posts above ......Could also be ignition transformer module that sits on top of engine - $1500. It also sounds like coil is shot. Are your coils upgraded to new part number? Once I changed the ignition transformer module, all plugs and both coils my problem was solved for 2 years then I replaced them all again then sold the car and gave up on the V-12.....this is an update from post above...was disappointed to sell the car...got 40k at Car max when MB would only give me 30k several years ago......drove it a total of 5 years - 30k miles and lost 5k a year in depreciation and probably another 5k in repairs...expensive car to maintain - also motor mounts were shot which required engine out and I gave up - Car needed about 12k in out of warranty repairs to keep it on the road after coil debacles.....

At 58k miles sold it - differential discs shot, another ABC struts failing and ABC hydraulic lines having to be replaced because pressure constantly exceeded the specs MB designed in weak lines....needless to say I learned lots about AMG - will not buy another - went Porsche GT Cars....
$1500 is a lot to shell out, even 1200 for coilpacks is steel, but I guess i'm going to have to do that. Most of the time, misfiring are caused by bad coils on any other "normal" cars that has an individual coil firing the plug...this design is terrible, most coils cost about 50-70 on normal cars. This car has 6 on each side, most MB should charge is $600.
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Old 08-29-2018, 09:29 AM
  #121  
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I have had 5 V12s now and NEVER again. Trouble with ALL of them!! They use the same **** since like 1998.And never improves them..You have echange services for them as well. Like 360 each..
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Old 08-29-2018, 09:19 PM
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Originally Posted by Chris The Swede View Post
I have had 5 V12s now and NEVER again. Trouble with ALL of them!! They use the same **** since like 1998.And never improves them..You have echange services for them as well. Like 360 each..

Fool me once...lol

5 times? Oh well, live and learn right, this is my first and last V12 as well. The power delivery is incredible but the maintenance and how tight everything is crammed into the car, is discouraging even for a mechanic like me.
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