S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Fuel Starvation around corners 2012 S550

Old Apr 24, 2025 | 12:47 PM
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Fuel Starvation around corners 2012 S550

I now have an S550 with 65K miles and I was going around a left corner and the whole engine shut down for about 4 seconds then came back.
Anyone else have this issue. My E class also did this sometimes though less dramatic.

Assuming its fuel pump or something?
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Old Apr 24, 2025 | 01:09 PM
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2010 E550, 273 Engine: 2012 S550, 278 Engine
Originally Posted by Surfer69E500
I now have an S550 with 65K miles and I was going around a left corner and the whole engine shut down for about 4 seconds then came back.
Anyone else have this issue. My E class also did this sometimes though less dramatic.

Assuming its fuel pump or something?
I have the same car with the same problem but not for four seconds, perhaps just one second. It happens if I make too fast tight turn with power and I was thinking it is the "slip control". Sharp turn will lift inside wheel up and with too much power the wheel will slip and cause the engine to bog down. I want to try the sharp turn with the slip control off but keep forgetting to do it. It should show the warning light in the cluster though that I have not seen...

The other thing I was thinking is the safety feature from the accelerometers that control power based on lateral "g" the car measures. I have noticed that with cruise control on the car slows down in curves that feel kind of tight. There is no warning from these of any kind, the car just slows down.

I don't think it is the fuel pump as the engine would shut down and for sure if you experience it for four seconds it cannot be the pump. Engine would be totally dead.

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Old Apr 24, 2025 | 01:16 PM
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simple (if risky) test for both of you - bung in dyno mode try same corner over again - if you crash it was the ESP trying to keep you on the road

distronic plus - will rein in throttle and then brake if you throw it at a corner with cruise active

Last edited by BOTUS; Apr 24, 2025 at 01:17 PM.
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Old Apr 26, 2025 | 02:43 AM
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Car is trying to keep itself from visiting the scenery at speed.

Turn off the safety nannies and see if the car was right... hmmm.

FWIW the ‘safety systems’ that pull throttle and apply brakes tend to intervene early, abruptly, and often. There tends to be a pretty big margin between between the car having a fit and a close call.

Best to try this somewhere with some runoff space.
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Old Apr 26, 2025 | 04:54 AM
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the only skill needed to drive a car fast was throttle control - the rest was bravery or stupidity

now the nannies are at it all the time they are all just awful to drive...

those same nannies, in the engineers need to get them to work, has led to solid damping to try and allow the grip at each wheel to be consistent enough the electronics can ruin everything - they did such a thorough job of it, walking is now more pleasant than driving modern cars...

Real cars go around corners like this




Last edited by BOTUS; Apr 26, 2025 at 04:58 AM.
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Old Apr 26, 2025 | 10:29 PM
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Originally Posted by BOTUS

Real cars go around corners like this


Fun Pork being treated appropriately. Love it!
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