11of12 ain’t good!!
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Joined: Sep 2017
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2007 S600
11of12 ain’t good!!
Hello Benz family! I have an issue and I hope I can find the answer here. I own a 2007 S600 and I have a misfire on cylinder 6. New, correct plugs, new coil, newish but working voltage transformer and new O2 sensors.
What am I missing? What else could cause a misfire on just one cylinder?
What am I missing? What else could cause a misfire on just one cylinder?
Junior Member
Joined: Dec 2021
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From: Al Raha Beach. Abu Dhabi
Silver 2013 S500 AMG. 4.7 litre V8 Bi Turbo 7 Speed Gearbox
Also swap that coil pack with another and see if the fault moves to the cylinder with the suspect lead ?
Quick way to fault find....
Quick way to fault find....
Super Member
Joined: May 2019
Posts: 671
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From: Omaha, NE
2007 S600
It would be, but you can't really do that on an S600. Each bank has a single coil pack for 12 plugs (6 cylinders) and they're not interchangeable. Or cheap.
Last edited by DaleB; Mar 22, 2022 at 08:58 AM.
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2007 S550 4Matic 2013 S550 Base
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From: Albuquerque
'10 CL550, '12 GL550
What else can cause a misfire?
… a fuel/air mixture so weak or so rich it cannot be ignited. This is obviously not an ignition system problem, but can be something like a vacuum leak, malfunctioning MAF sensor, etc.
Given what merikuns call multipoint injection, fueling mechanics are not so likely, but it’s certainly possible for not all cylinders to be equally mechanically sound and a weak one may be susceptible to misfiring (first). Perhaps think testing compression.
… a fuel/air mixture so weak or so rich it cannot be ignited. This is obviously not an ignition system problem, but can be something like a vacuum leak, malfunctioning MAF sensor, etc.
Given what merikuns call multipoint injection, fueling mechanics are not so likely, but it’s certainly possible for not all cylinders to be equally mechanically sound and a weak one may be susceptible to misfiring (first). Perhaps think testing compression.
Last edited by lkchris; Mar 24, 2022 at 01:55 AM.
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Joined: May 2019
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From: Omaha, NE
2007 S600
It is possible that he could have a bad injector, a burned valve, a worn cam lobe or something of that sort. The body of data available for this particular instance (early production S600 with a single cylinder misfire) would indicate it's likely a coil pack. I had a persistent #9 misfire... shipped both packs off to Clark for rebuild, replaced the VT, still had a #9 misfire that I spent months trying to troubleshoot because, hey, I couldn't have possibly gotten TWO coil packs failing on #9, right?
Finally shipped the left bank pack back to Clark. Intermittent #9 failure, he fixed it under warranty, I wrote off the months of trying to fix a nonexistent fuel or air problem. On the bright side, I did find and fix a few bad vacuum lines along the way, and installed some silicone turbo-intercooler hoses that were much better than stock, so there's that.
To the OP, if you haven't run a few bottles of injector cleaner through it yet, you could try that.
Finally shipped the left bank pack back to Clark. Intermittent #9 failure, he fixed it under warranty, I wrote off the months of trying to fix a nonexistent fuel or air problem. On the bright side, I did find and fix a few bad vacuum lines along the way, and installed some silicone turbo-intercooler hoses that were much better than stock, so there's that.
To the OP, if you haven't run a few bottles of injector cleaner through it yet, you could try that.
