2007 C230 - would crank for 4 -6 seconds before it starts. It wasnt like this before. It would usually start right away. Anybody experienced this?

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'85 300D Cal 280,000 miles
'14 GLK 350 60000 miles

Might be an alternator issue. Check out the tech article that I linked to below; hopefully it'll help you troubleshoot the issue. If you have any more questions, feel free to post a Comment just below the article and someone will get back to you with more detailed info...Best of luck!

Mercedes-Benz W203 Alternator Replacement - (2001-2007) C230, C280, C350, C240, C320 | Pelican Parts DIY Maintenance Article


-Dmitry

Alternator? Hmmmmmm..............I'd start by checking the fuel pressure

You're right! Probably should have started with the fuel pressure first.

-Dmitry