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post #1 of 7 (permalink) Old 04-12-2019, 03:08 PM Thread Starter
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Suddenly Misfiring all over

2004 SL600 V12 twin turbo, 87K Miles, car is like new inside and out, I've put 2K miles on it in the last 15 months. Driving today, all perfect as usual, Suddenly check engine light came on and noticeable loss of power. I was a mile from home so drove gently and parked. Using generic code reader as I don't have an SDS... Codes: P0307, P0309, P0311, P0308, P0310, P0300. Looks like a lot of misfires have become the order of the day. Could it be that I need an ignition coil pack? That would be one side of the engine. Or maybe there is another cause? It can't be spark plugs or wires since this all came on so suddenly. Or possible fuel issue? Any help is always appreciated.

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post #2 of 7 (permalink) Old 04-12-2019, 03:56 PM
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Betting 10:1 it is the coil packs. There are threads on how to fix them. If above your skill, there are others that can fix them for you too.
I don't have a V12 so I don't know the diagnostics required. I'm sure others will know.
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post #3 of 7 (permalink) Old 04-13-2019, 05:38 AM
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Betting 10:1 it is the coil packs. There are threads on how to fix them. If above your skill, there are others that can fix them for you too.
I don't have a V12 so I don't know the diagnostics required. I'm sure others will know.
I agree. I just went through a similar situation on my '03 Jag. After 15 years those coil packs (one per cylinder) in your SL600 can and do get tired. I doubt more than two are toast. Easy fix for you if you've got some tools. Don't want to play around under the hood? Get the car to a well known/quality repair shop and let them do it for you. Coil pack replacement is easy and one of the low cost repairs older cars, even Mercedes, get to try out sooner or later.
If you drive the car in 'limp mode' to a shop that's within a mile or so you'll do no damage but going much further has the potential to mess up your catalytic converters - those aren't inexpensive . Call for a car transporter .
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post #4 of 7 (permalink) Old 04-14-2019, 05:30 PM
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I agree. I just went through a similar situation on my '03 Jag. After 15 years those coil packs (one per cylinder) in your SL600 can and do get tired. I doubt more than two are toast. Easy fix for you if you've got some tools. Don't want to play around under the hood? Get the car to a well known/quality repair shop and let them do it for you. Coil pack replacement is easy and one of the low cost repairs older cars, even Mercedes, get to try out sooner or later.
If you drive the car in 'limp mode' to a shop that's within a mile or so you'll do no damage but going much further has the potential to mess up your catalytic converters - those aren't inexpensive . Call for a car transporter .
I also doubt more than two are bad since there are only two

They are also not a low cost repair. Each side has one common coil and they run around $1200 each.

I'm guessing one of the coil packs. There is a company that will send you a loaner to test it out with an option to buy. I forget who it is but they sounded decent and I think a quick search on here should help locate them. If it is a coil, I suggest checking the other side as well. That is if you are gentle and not ham fisted.

If you can methodically and gingerly pull the good coil it is worth replacing the insulators. They are made of silicone and dry out and crack and cause the coils to absorb more heat than they should which can lead to failure. I would bet the bad coil, if it is in fact bad, will have deteriorated silicone insulators.

Also, you don't have spark plug cables on your engine.
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post #5 of 7 (permalink) Old 04-17-2019, 08:21 AM
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Here is your recommended next stop:

V12icpack, Mercedes S600 ignition coil pack repair, ECU, misfires V12 engines - Home

Ask for Clark. He's AWESOME and will save you a bunch of $$$$.
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post #6 of 7 (permalink) Old 04-18-2019, 05:03 AM
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post #7 of 7 (permalink) Old Today, 05:29 AM
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Originally Posted by Triple cranks View Post
I also doubt more than two are bad since there are only two

They are also not a low cost repair. Each side has one common coil and they run around $1200 each.

I'm guessing one of the coil packs. There is a company that will send you a loaner to test it out with an option to buy. I forget who it is but they sounded decent and I think a quick search on here should help locate them. If it is a coil, I suggest checking the other side as well. That is if you are gentle and not ham fisted.

If you can methodically and gingerly pull the good coil it is worth replacing the insulators. They are made of silicone and dry out and crack and cause the coils to absorb more heat than they should which can lead to failure. I would bet the bad coil, if it is in fact bad, will have deteriorated silicone insulators.

Also, you don't have spark plug cables on your engine.


Been traveling so pardon the slow response. Thanks for the education on engine coils used on an SL600 V12. I, obviously, have never had my hands on a SL600 engine and made the mistake of assuming the SL600 V12 was sparked like my SL550, Jag XK8 4.2 or my old Jag XKS V12. Wrong. I'll know better next time

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