Misfire, spark plug or ignition coil
Thread Starter
Junior Member
Joined: Mar 2015
Posts: 28
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07 S600 (W221)
Misfire, spark plug or ignition coil
random misfire in just ONE cylinder in both banks of my 07 S600. Being that the check engine light has been intermittent; sometimes coming on/going off for several days or weeks at a time; could this be more related to plugs or would the coils need replaced? I'm getting P0306 and P0311 (cyl6 and cyl11)
Obviously, I'm hoping it's not the ignition coil as both would require replacing, any assistance is greatly appreciate
Obviously, I'm hoping it's not the ignition coil as both would require replacing, any assistance is greatly appreciate
Senior Member
Joined: Jun 2015
Posts: 257
Likes: 100
From: South Padre Is, Texas
2007 S600, 911 & XJ8
Here's a couple of my posts on the subject:
https://mbworld.org/forums/s-class-w...tion-data.html
https://mbworld.org/forums/s-class-w...placement.html
The first being about diagnosis and, the second, a How-To...
Read them both... My guess, for me, came down to a coil pack, which apparently was correct, in that, the problem hasn't returned
But, since you're getting misfire from both sides, I'd guess plugs for you. When were they last replaced? Recommended is every 60K...
Good luck and please post what you ultimately find for the rest of us.
Regards... Mark
https://mbworld.org/forums/s-class-w...tion-data.html
https://mbworld.org/forums/s-class-w...placement.html
The first being about diagnosis and, the second, a How-To...
Read them both... My guess, for me, came down to a coil pack, which apparently was correct, in that, the problem hasn't returned
But, since you're getting misfire from both sides, I'd guess plugs for you. When were they last replaced? Recommended is every 60K...
Good luck and please post what you ultimately find for the rest of us.
Regards... Mark
MBWorld Fanatic!
Joined: Dec 2004
Posts: 4,268
Likes: 253
plugs closer to the fw go first. so my guess is plugs.
mileage? the v12 is rough on plugs. they are rated for 100k miles or thereabouts but in reality they go much much sooner especially if operated in hot climates.
mileage? the v12 is rough on plugs. they are rated for 100k miles or thereabouts but in reality they go much much sooner especially if operated in hot climates.
MBWorld Fanatic!
Joined: Nov 2004
Posts: 1,691
Likes: 143
W221 S600, W220 S55 AMG Kompressor, W124 300E, W140 S320, W210 E3204M W164 ML320 Bluetec
random misfire in just ONE cylinder in both banks of my 07 S600. Being that the check engine light has been intermittent; sometimes coming on/going off for several days or weeks at a time; could this be more related to plugs or would the coils need replaced? I'm getting P0306 and P0311 (cyl6 and cyl11)
Obviously, I'm hoping it's not the ignition coil as both would require replacing, any assistance is greatly appreciate
Obviously, I'm hoping it's not the ignition coil as both would require replacing, any assistance is greatly appreciate
Once you change the plugs, (assuming you are doing it yourself) you will be familiar enough with the disassembly of the parts of the engine to easily change the coil pack if that ends up being required.
MBWorld Fanatic!
Joined: Nov 2004
Posts: 1,691
Likes: 143
W221 S600, W220 S55 AMG Kompressor, W124 300E, W140 S320, W210 E3204M W164 ML320 Bluetec
