Car won't start in the cold - Page 3 - Mercedes-Benz Forum

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post #21 of 24 (permalink) Old 01-31-2016, 06:01 PM
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btw, the C240 cranks good, but won't fire up. and when it does fire up, the C240 seems to be burning all the excess gas. :-(
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post #22 of 24 (permalink) Old 03-08-2016, 01:57 PM
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Originally Posted by Mlee1951 View Post
These days, I have to try several attempts to start the C240. Problem with the cold start started to happen late December. Can someone please shed some light regarding an update to the Engine Control Unit (I am assuming it is a software update of some sort) and a cost estimate. For the last few years, I haven't solved my cold start problem. Any suggestion will be greatly appreciated. Thanks......
I went away on vacation for 3 weeks in February and when I got back, the C240 fired up right away (probably because it wasn't a freezing day). Now, the weather has cooled again, it take a few crank to start the car. :-(
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post #23 of 24 (permalink) Old 09-03-2016, 05:46 PM
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Originally Posted by ewilson80 View Post
When you were having this problem, once the car was started did it give you any more starting problems during the day? I am having the same issue but once mine starts its good to go for the day, I can restart it no problem, just seems like its doesn't want to start first thing in the morning. It didn't do this last winter either, just noticed it this winter as it started cooling down, and it doesn't get that cold here in central valley, ca. Low around 30 @ night.
Ewilson80 - did you figure out your issue? My 2004 s500 is doing as you describe. Not responding in the mornings, but once it does, it is typically good the rest of the day. By not responding, I mean I can turn the key to the start position, but it does not turn over at all. All electronics work. After the day warms up to mid 80's or so, it seems to start without issue. Not sure why 65 to 80 degree mornings would keep it from turning over.
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post #24 of 24 (permalink) Old 09-03-2016, 11:56 PM
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When I brought the car to the dealer, they found out that the gas was seeping back into the gas tank and therefore leaving the gas line dry. Which makes it hard to start in the "winter" cold season. During the other 3 seasons, the car runs perfect. The MB mechanic recommended changing the fuel pump and the sending unit for over $5k, but they wouldn't guarantee this will fix my problem. Well, my mechanic recommended adding a fuel additive (Sea Foam) when I fill up my tank during the beginning of the winter season and during mid-season. At night, I would restart the car for a minute or so before going to bed. In the morning, I would turn on the car's ignition and wait a bit (20 seconds or so) before trying to crank over the engine. In most cases, I can start the car successfully on the first crank. Other times, it took 2 (and rarely 3) tries to start the car. Ever since I added the fuel additive, at least the car doesn't sputters that badly anymore. I have read on someone's post that the MB dealer upgraded the s/w on the computer module and it fixed their problem. When I asked the MB dealer, they didn't want to hear anything I asked them about and to leave it for their mechanic to figure it out. Well, I am not going to blow $5k and still have a problem with the car. Seems like lots of cars reported this type of problem and MB refuses to address it, which makes me pretty disappointed.
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