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2008 B200
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Discussion Starter · #1 ·
Our 2008 B200 will stumble quite often after a morning cold start. The engine rpm will drop very low and the engine will almost die. It does this intermittently, the car once went into limp home stage. We brought it to the dealer and they haven't found anything. Anyone have this experience.
 

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06 White B200T
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Is it a manual or CVT?

Anthony
 

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2008 B200
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I also have the same problem with my 2008 B200 w/CVT. Have to let the engine (tranny?) warm up quite a bit if I don't want it to stall. It doesn't even have to be that cold, say +5 to 10 degrees celcius or less. Haven't seen my dealer yet, but will have to soon, as temperatures are getting colder, and problem getting worse. This only started this past October, and I have only 24k on it. Anyone have any ideas on this?
 

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B 180
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Can I ask is the actual battery in good shape? Does the car start up after the first half second crank or does it wheeze and sound like a 70's MG?
With lower temps batteries are working very hard to generate the amps, and if you just manage to get the car started it maybe the alternator hasn't got the revs to charge and keep the electrics all on at the same time.

The CVT oil getting to thick with the temps shouldn't be a problem don't MB spend millions on climate testing?
 

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2008 B200
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Thanks for your reply. I just had a B service and was told my battery was in top shape. I tried turning everything on, including both heated seats, rear window defroster, etc) and had the same result as if everything was turned off. The engine starts at lightening fast speed, so I'm pretty sure it's not the battery. It really feels like the gas isn't getting to the cylinders. If you pump the gas pedal just right it helps, but only sometimes. For now, out of fear of being seen stalling my Benz, I just let it warm up more than usual. Shouldn't have to...
 

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2008 B200
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Discussion Starter · #7 ·
Same exact symptoms as mine, coincidentally it's in the shop today, hopefully they find something because they didn't the last time. I'm pretty sure it's tranny related.
 

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B 180
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For me I just don't think the CVT is the culprit for a stationary car to want to stall, I mean if the car isn't moving why would the gearbox be spinning?
I would think it would be the fuel system delivery, could be more to do with the air intake side of things, faulty MAF?

Norm let us know what the garage diagnoses.

Cheers
 

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The Drehmomentwandler (torque converter) would put a drag on the engine at idle, so the interface between CVT software and engine software may not be smooth enough.
 

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2008 B200
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Discussion Starter · #11 ·
The car was loosing fuel pressure, they found a defective o-ring on the fuel pump and feel this was the problem. Time will tell.
 

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Fascinating, and that did not trigger a check engine light?

Even my 1966 Peugeot has a fuel pressure warning light!

Anyway, I am glad they found the problem for you!
 

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2008 B200
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I stopped by my dealer last night to have a headlamp bulb changed and mentioned this problem. The two mechanics there said they had never heard of this and that I should book an appointment to have them plug it into their diagnostics computer. It is now getting colder (nearing freezing point everyday now) and the problem is getting worse. Since the revolutions go to 1,000 nearly instantly after start, I have to depress gas pedal to keep it at 1,600 to 1,800 for a while before I can drive off. We sometimes have temperatures go down to minus 30 degrees celcius in Ottawa in winter, so I guess I have no choice to get it looked at.
 

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2008 B200
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Discussion Starter · #16 ·
They didn't find anything wrong with mine through the diagnostic, it was only when they put the fuel pressure gauge on it that they noticed.
 

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I found a trick that will let me drive away faster than if I just wait for it to really warm up. I start engine, let it warm up a normal amount of time (depends on how cold it is outside), then I put it in Drive and don't let go of the brake for at least three seconds. At first it stumbles and coughs, but after that magic tree seconds the RPM goes to normal and I can drive off as normal.
 
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