E63 caput @ 43k šŸ™„

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If you are going to push ā€œthe devilā€™s numberā€, (my recommended max on stock rods) Iā€™d halve the time/mileage that mercedes say. 6 months/5000 miles sounds ideal for oil. 10k for plugs max
Cheers!
10k for plugs šŸ˜³
 
They get pretty coked up on the m157 as standard. Always surprise me how fouled they can be when you remove them. Often unevenly fouled too.
Misfires are known to kill these engines. Cheap insurance
Would that not be an indicator of a further problem like burning oil or poor combustion or tune perhaps rather than anything wrong with the plug.

Would the new plug not just get coked up again or if you cleaned the old one up and put it back its fine. Symptom rather than cause. šŸ¤·ā€ā™‚ļø
 
Would that not be an indicator of a further problem like burning oil or poor combustion or tune perhaps rather than anything wrong with the plug.

Would the new plug not just get coked up again or if you cleaned the old one up and put it back its fine. Symptom rather than cause. šŸ¤·ā€ā™‚ļø
I think much like AMG engines of old, they are mapped quite rich at the top end from the factory.
 
Yes like Ā£2000 a year thatā€™s why a lot of people get third party warranty but again not sure if itā€™s worth the paper itā€™s written on.
Iv spoken to loads of AMG/Merc Specialists long as you let everything warm up before booting and cool down before turning the car off with doing services as scheduled you ā€œ shouldā€ be fine
My car will run cooling fans after i turn the car of.
E63 2012
 
I think much like AMG engines of old, they are mapped quite rich at the top end from the factory.
If so maybe its a safety thing so the engine runs a little cooler and ensure it never goes lean
 
My car will run cooling fans after i turn the car of.
E63 2012

My 6.2 E63 runs cooling fans also. If I've just had say an enthusiastic run in my car and the engine oil is still on the high side say 115degrees I always let the car idle for 5/10 minutes for the oil to cool a little. Most times I stop the enthusiastic drive a little before I'm home. But I don't always remember as it's so much fun lol. But I normally shut it off at around the 105 degree mark. But it's quite normal for the fans to run for a little after shut down.
 
My 33K mile M157 is Ā£2850 for 1 year warranty. I believe C63's are a similar price.



Mercedes wouldn't entertain any claim on an engine problem if its been remapped.
Ye sorry was a bit off the price I remember it being Ā£2000 and something and just put that figure out there
 
They get pretty coked up on the m157 as standard. Always surprise me how fouled they can be when you remove them. Often unevenly fouled too.
At least one of those failed engines had soft carbon on the piston crown and a disgusting accumulation of carbon at the top of the bore where the rings don't sweep. Soft though - not baked. Looked to me like too many faff about (in and out of the garage to wash the car) cold starts without subsequent bringing to full temp.
Misfires are known to kill these engines. Cheap insurance
I'm curious - what happens when they start missing?
 
Conrods may bend. Some of mine did...
 
Conrods may bend. Some of mine did...
This video highlights the conrod issue
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And to show its not just the M157
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This video highlights the conrod issue
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And to show its not just the M157
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Might avoid watching these šŸ˜‰
 
This video highlights the conrod issue
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And to show its not just the M157
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Keep em oem, no grief.
 
It's not obvious how a misfire bends rods though.
This is just a guess off the top of my head

If a cylinder misfires there is a momentary loss of power. I think this could result in increased load on the crank and in turn the conrods when the next cylinder fires correctly. I think this is only an issue under full load and wouldn't be an issue at slow speeds or not accelerating. Conrods must be the week link in the chain and can't withstand the increased load.

No idea if that's the reason but would sound a reasonable theory to me.
 
It's not obvious how a misfire bends rods though.
Hereā€™s what I think happens. The piston rises to the top of the bore on a compression stroke. The direct injector is ready to go, squirts in the fuel. The spark plug fails to fire. The air fuel mix stays there as the piston is dragged down by the rest of the engine. Piston begins to be driven up by the con rod for the exhaust stroke carrying the unburned charge still there in the chamber. The instant the exhaust valve opens, even the tiniest smidge, the charge is lit by exposure to the hot contents of the exhaust manifold. But the piston is still coming up the bore hard to push out the spent exhaust that should be there. The narrow top of the con rod doesnā€™t help here. The rod is exposed to uneven pressure from an uncontrolled burn and it tweaks.
 
Hereā€™s what I think happens. The piston rises to the top of the bore on a compression stroke. The direct injector is ready to go, squirts in the fuel. The spark plug fails to fire. The air fuel mix stays there as the piston is dragged down by the rest of the engine. Piston begins to be driven up by the con rod for the exhaust stroke carrying the unburned charge still there in the chamber. The instant the exhaust valve opens, even the tiniest smidge, the charge is lit by exposure to the hot contents of the exhaust manifold. But the piston is still coming up the bore hard to push out the spent exhaust that should be there. The narrow top of the con rod doesnā€™t help here. The rod is exposed to uneven pressure from an uncontrolled burn and it tweaks.
Anti lag systems create this effect intentionally to keep the turbo spooled up but maybe that's different because it's not under full load
 
The misfire occurs at high revs with full throttle, initially only in one of the two hottest-running cylinders, No. 1 or No. 5. The cylinder I had to have bored out and linered, with the most bent conrod, was No. 5.
 

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