Beatmatcher247

P0300 Random Cylinder Missfire Detected
P0301 Cylinder 1 missfire
P0309 Cylidner 9 missfire
P0310 Cylinder 10 missfire
P0743 Torque Converter Clutch Circuit Electrical

After a fun day of driving and jumping the lip of a small round about about 3-4" when i took its electronic stability control off (will not do that again), it started throwing these codes.

I picked up a Foxwell NT530 multi scan tool with optional mercedes software suite and am able to reset the codes. it does not run roughly.
Upon shut down and restart it will throw the codes again.

Up until this point it has been well maintained from what I can tell from its service records, it has about 69,000 miles.
Any of you more technical folks have any ideas what this could be ?

BOTUS

check some other posts - V12 misfire is normal and very expensive (in later life its more likely to have a misfire than it is to run without one)
search on this forum work really well compared to many others - never assume you are the first with the issue many thousands will have been their first

https://mbworld.org/forums/s-class-w...2-misfire.html read vettekb and review the link provided

BOTUS

odd the link doesn't work - here it is with https at the front https://www.v12icpack.com/

vettebk

Thanks, Botus. My bad. I added an s to the website address in error. v12icpack.com no s.

vettebk

You may have two problems. You have misfires reported on both banks which is unusual. I am guessing both of your packs are bad especially at 69K miles. You may also have a problem with the Voltage Transformer and you can resolve that also with Clark Rupp. I would contact him. He has a rental program, sort of a try it and if it fixes the problem, buy it and if not, send it back and pay a minimal fee.

Good Luck and Keep us posted.

BOTUS

last night spent 2 hours watching that guys videos of what goes wrong...

the iron core inside each of the 24 OEM coil sticks breakdowns with time (not mileage), often randomly with any of the 24 coil sticks dying around the 11 year mark, as this fails the windings short and can send voltage spikes round the system that often blows the brains out of the voltage transformer and or the whole banks coil pack. So one ageing coil stick starting to breakdown starts a chain of events introducing the possibility of three major issues

its quite an odd get up - rather than a coil on top of each plug with its own 12v power supply like the V8s get - the V12 mercs have "two coils sticks per cyl" that swap duties back and forth each spark. One spark its being a 180v main coil, then next spark its an emission clean up spark coming fractionally late to the party as a 23v coil. To achieve the magic spark fest, each bank of 12 coil sticks are part of a complex electronic circuit board making one bank's (6 cyls) coil pack.

so the issue usually starts with an owner exercising the car, which makes life harder for any of the coils, and that often brings in a random one cyl coil stick failure. But that can blow the whole coil packs circuit board taking out multiple cyls on one bank. And or blowing the brains in the separate voltage transformer - this VT is what gets the required 180v / 23v power supply change. Thus one coil stick starting to age, often ends up giving a two or three cyl misfire as the voltage transformer gets damaged.

However even with good coil packs the voltage transformer can get cooked to death from normal engine heat over time, and this can bring down the whole set up in a costly disaster

Usual scenario, one coil stick ageing can bring down the whole lot, and even when the whole 12 stick coil pack on one bank is replaced, a damaged VT (caused as the first stick died) often ends up killing the replacement coil pack and its a circle of expensive hell and head scratching

so the fix is three opportunities for a mortgage

remove your voltage transformer (VT) today and exchange it for one of his upgraded longer lasting overhauled VT OEM boxes now with two fuses you can replace - to stop a complaining coil stick sending back a spike and blowing up the Merc OEM $800 VT unit

then if brave and stupid you can buy a faulty coil stick on ebay and likely trash the whole bank trying to fit one new budget fake coil stick for a cyl you identify as playing up, OR swap out the whole group of coil sticks (made in house via china) with his upgraded coil pack where all sticks have been replaced and re-soldered carefully to the refreshed circuit board

alternate option replace the OEM VT and fit his upgraded remote located (for a cooler location) more sophisticated VT box which I guess can cope in solid state with coil sticks throwing teddies and you don't need to play swapping fuses in the rain at the side of the road...

Allegedly the VT, both coil packs, and a set of 24 spark plugs - at circa $7k - should be swapped around the 70k miles and or every 7 year mark


https://www.v12icpack.com/




.

JohnLane

Damn.... Glad to have traded the 275 powered car for one equipped with the 279. I just ‘get’ to replace spark plugs with two dozen ‘connectors’ (plug wires) as there is seemingly no removing them without knowing which of them got damaged. We pay to play!

vettebk

I have to say I love my V12. Yes, it is finicky with this weird ignition setup; but I have to say mine runs really well. I do like Clark Rupp's coil packs and voltage transformer over OEM parts. I think his products withstand the heat in the engine bay better.

In my opinion, a well maintained Mercedes S class is the finest motorcar in the World.

JohnLane

I’m another who has quite the man crush for the force-fed bent-12.

I expect to be driving (obviously used) S-65’s for the rest of my days.

Beatmatcher247

Thank you for the very valuable information, Botus and Vettebk.

Beatmatcher247

I'm in love with it too. Guys like us must like to get kicked in the ***** once in a while. LOL

Beatmatcher247

I think we might have a issue with the solenoid valve body with conductor plate

Replacing the main and auxiliary batteries as it is probably time anyway. (Is unlikely this will help, just preventative maintenance)