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

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post #21 of 29 (permalink) Old 01-31-2016, 05:01 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 29 (permalink) Old 03-08-2016, 12:57 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 29 (permalink) Old 09-03-2016, 04:46 PM
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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 29 (permalink) Old 09-03-2016, 10:56 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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post #25 of 29 (permalink) Old 01-15-2017, 07:07 PM
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Just another with the same problem. This is my ladyfriend's car - '07 C230 with ~70Kmi. It did this last year near the end of winter, and after a new battery all was OK. Now the problem's back. Wouldn't start next morning after visiting her mother 40mi away. Mechanic put in new plugs, it seemed to start fine, then the temp went below freezing last night and again no start. Grasping at straws, I don't suppose the green button on what looks like the computer inside the glove box is a reset that might have any effect?

Anything under the hood that aiming a heat gun at might help? If it'll start once it warms up again I'll try a gas-drying additive.

Thanks!
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post #26 of 29 (permalink) Old 01-16-2017, 12:34 AM
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This cold start problem happens when the weather is near freezing mid-30's degrees. I also suspect it has something to do with the winter blend gas because it was quite cold during November and the car fired right up every time. Sometime later in December, the car started to show problem with the morning cold starts. My friend recommended I add a gas additive Sea Foam the next time I filled up. It seems to help a bit, but it still didn't completely solve my problem. I have also tried all the top-tier gas and it didn't help. I also notice that when I start up the car in the afternoon, it seems to start a whole lot better.

When I start the car, I turn on the key to the "on" position and let it sit for a bit (20-30 seconds) and then try to crank the car over.

BTW, the MB dealer recommended I change the fuel pump and this other part associated with the fuel pump. Dealer wanted over $3,200 to replace it and they won't guarantee this will fix my problem. :-(
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post #27 of 29 (permalink) Old 01-18-2017, 07:51 PM
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Just a question, do these no start usually happen under frigid weather? One thing I've come across is that the exhaust system doesn't drain well, usually happens a lot with vehicles that idle a lot or that are driven very gently (as in, not usually driven aggressively on the high way). What happens in this case is that the excess water in the exhaust (usually the muffler) freezes, causing excessive back pressure. One simple way to see if this is the issue, is to drill a small hole on the lowest part of the muffler and see if water comes out.

I'm not saying this is the issue, but it's something to keep in mind.
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post #28 of 29 (permalink) Old 01-18-2017, 07:56 PM
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Originally Posted by W210_fury View Post
Just a question, do these no start usually happen under frigid weather? One thing I've come across is that the exhaust system doesn't drain well, usually happens a lot with vehicles that idle a lot or that are driven very gently (as in, not usually driven aggressively on the high way). What happens in this case is that the excess water in the exhaust (usually the muffler) freezes, causing excessive back pressure. One simple way to see if this is the issue, is to drill a small hole on the lowest part of the muffler and see if water comes out.

I'm not saying this is the issue, but it's something to keep in mind.
Note: this would be a crank no start condition
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post #29 of 29 (permalink) Old 01-30-2017, 11:49 AM
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Car won't start in the cold

Further to my comment (#26) with an '07 C230, the problem persists after two rounds of adding dry gas (we had a warmup, but then it went below freezing again). Yesterday I got it going in ~34 deg weather by covering the motor with moving pads and first putting a space heater in front of the radiator. 20min of running that did nothing, nor did a shot of starting ether. Then I aimed a heat gun at a distribution manifold of some sort up on the front left (driver's side) corner that I assume must be fuel distribution since there are six lines coming out of it. Nothing. Then I aimed the heat gun at the front right of the motor, down and toward the center, for maybe 5min, and it started without much trouble.
Admittedly this is just a single data point, but is there anything up front there that might correlate with the result? And what might that say about what t the source of the difficulty is?
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