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Old 08-25-2005, 11:15 AM
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Join Date: Aug 2005
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Hard Starting Problems 2000 C230

I have 2000 C230 4 cylinder model with 50,000K miles. Just recently it has been starting hard. I have spent over $400 for new plugs, fuel system flush and filter. I have also spent over $500 for a new mass air flow sensor. It now starts fine after previously running but still starts a little hard when starting after it has been sitting for a while like overnight. The mass air flow sensor was the only code reading under the diagnostic which is why it was replaced. The technician's seem stumped. Any ideas?

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Old 08-25-2005, 09:41 PM
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Join Date: Feb 2002
Location: east coast
Posts: 1,255
who did and what is a fuel system flush.

has the fuel pressure been tested? like first thing in morning

How old is your battery? those suckers like to be changed ( or tested and serviced ) every four years
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Old 08-25-2005, 09:49 PM
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Join Date: Aug 2005
Posts: 64
I would put a fuel pressure tester on the thing and let it sit over night. Most likely it is losing fuel pressure after sitting for an extended period of time. Maybe a bad o ring in the fuel pump/sender assembly. I've seen this on the newer c class cars, and have replaced both the left and the right fuel senders to resolve the problem.

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