W203 C240 dies in traffic - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 03-23-2012, 09:28 AM Thread Starter
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W203 C240 dies in traffic

Yesterday was the second and third time my C240 just died pulling away from a traffic light (or 4-way stop). It runs out 1st gear, then right when it SHOULD shift, the engine sputters and the dash lights up like a christmas tree, until the engine cuts off. I have checked the info panel, no malfunctions. I ran an Actron code scanner, no codes. I used a high quality battery tester, good static voltage, good standby voltage, AND the alternator seems to be (at idle) putting out proper voltage AND amperage.

HELP PLEASE!
Thank you in advance.
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post #2 of 4 (permalink) Old 03-23-2012, 10:55 AM
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Welcome. Please take a minute to click user cp and edit details to add your vehicle and location information as it can be helpful information when you're seeking assistance.

When this happens does it restart right away? Or do you have to wait a few minutes? On the restart is it right away or is it kind of hard to start?

What happens if you put it in W mode (starting in second gear)?

Does it matter how hard you are accelerating?

Can you get real-time values for fuel trim from your scanner? If so what are they?

You might also post this into the forum for your car (W203) instead of just this general one, which is really more for generic stuff about all things MB, not specific car issues.

Good luck!

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #3 of 4 (permalink) Old 03-23-2012, 11:34 AM Thread Starter
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(Thread Starter)
Trying to answer Q's in order:

-When it dies, the started spins the engine over right away, but it takes 10-12 revolutions for the engine to fire, like fuel or spark isn't being immediately present.

-Haven't tried "W" mode. I'll try it next time.
Living in Florida, "W" mode is like heated leather
seat's... don't see needing them. For that matter
I refrain from using manual mode for concern of
excessively wearing the internal components.

-Happens when accelerating away from a traffic light or 4-way stop. Compared to my Mustangs, I am rather tame in how I pull away, but it's all relative. I'm a little sensitive to "caning" it unnecessarily.

-I have not tried scanning for real time values in fuel trim. My Actron OBD-II scanner supports that function, but it's usually home in the garage. Additionally, the placement of the OBD port under the dash puts it in my way for normal driving. I'll connect it tonight and take a little drive... What are "normal" numbers? I'll post what I see.

Thank you!
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post #4 of 4 (permalink) Old 03-25-2012, 07:33 PM
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Check fuel pressure...may have a bad fuel filter (pressure regulator built-in) or a bad fuel pump! Fuel pressure must be at least 3.7 bar.

I'M A FACTORY-TRAINED MERCEDES-BENZ MASTER SYSTEMS TECHNICIAN, ASE (AUTOMOTIVE SERVICE OF EXCELLENCE) MASTER AUTOMOBILE TECHNICIAN, BOSCH MASTER TECHNICIAN, MECP (MOBILE ELECTRONICS CERTIFIED PROFESSIONALS) MASTER TECHNICIAN, AND A L1 ASE & BOSCH ADVANCED ENGINE PERFORMANCE SPECIALIST WITH A MASTER'S IN BUSINESS ADMINISTRATION.
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