CLK-Class (W209) 2003 on: CLK 270 CDI, CLK 200K, CLK 200 CGI, CLK 240, CLK 320, CLK 350, CLK 500, CLK 550 [Coupes & Cabriolets]

Something really weird just happened.

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Old Sep 27, 2016 | 12:49 PM
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Something really weird just happened.

OK true story, over the past two days my 2004 320CLK started to crank a little slower, almost as if the battery was low. There were no indicators in dash of a battery or any other condition and no check engine light. After about two times starting up and cranking slow, it decided not to crank at all. I was able to jump start the car and drove home that day fine. I go to start it today and first attempt it does not start as expected because i figure the battery is going out right? Well, after connecting the ODB scanner to the laptop and verifying no codes are present, i left the key in the ON position for a couple minutes and low and behold it started up after that a little slow but it cranked hard enough to start.

So I'm confused. If it was the battery then how could it sort of build up a charge after a minute or two and then crank? Makes no sense.

Does this sounds like it could be a starter or is there some other relay or what not involved?

Anyone run into this before?

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Old Sep 27, 2016 | 02:33 PM
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2006 E55, 2012 GLK350 & 1992 190e sportline
They way I see it you have 2 options. Have it scanned on STAR or get a new battery.

I prefer to have my car scanned if I am hunting an electrical problem but depending on the battery age you might just want to swap it anyway.
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Old Sep 27, 2016 | 05:36 PM
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270 cdi w209
I had similar symptoms before I got a new battery.
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Old Sep 27, 2016 | 05:50 PM
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W204 C63 AMG, W212 E250 CGI, C207 E250 CGI
my moneys on a new battery.
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Old Sep 27, 2016 | 08:59 PM
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Battery. If you are in the USA, I recommend the Advance Auto Platinum. It's an AGM (glass-mat) and will last longer than traditional lead acid.
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Old Sep 28, 2016 | 04:43 AM
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Thanks everyone - I will go by the advanced auto parts store near my house and have them check the battery. If I do need one, sounds like Bosch S6588B S6 Flat Plate AGM Battery would be the winner
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