Mercedes c 180 start up problem

Asked by Barnie2 Feb 18, 2020 at 03:41 PM about the 2009 Mercedes-Benz C-Class

Question type: Maintenance & Repair

My c180 have a very rough and irregular cold start.
The engine is misfiring, idle irregular, jerking,
almost shuts down then fires back up. This lasts
for about 30 - 40 seconds then engine smooths
out and runs normal. It feels/sounds like a
switch/valve/sensor that kicks in after 30-40
seconds where after it runs normal. This only
happens once a day, usually in the morning or
after about 8 hours since last start.
Can someone please help?

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