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Cold Start Question

Old 07-27-2009, 12:39 PM
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2011 W212 E550
Smile Cold Start Question

I have '09 C350 appx 7000 miles.....morning cold engine start (ambient temp appx 65 deg F) I will hear a somewhat unusual sound - - low pitch "growl" in front crank area----it will last for a minute or two----then goes away. Oil level normal and no messages/lights/etc. Anyone else experience this please? Thanks for your review Love the car!....Ralph Tucker
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Old 07-27-2009, 02:03 PM
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I am almost positive my car has that same sound on startup
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Old 07-27-2009, 06:36 PM
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C300 4matic Sport, CBR 954
could be a normal thing but i dont have that, granted my car is in the garage, but to be sure u should take it to the dealer and have it looked at just in case.
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Old 07-27-2009, 11:05 PM
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On a cold start, all modern engines are doing everything they can to get the cats as hot as fast as they can to reduce emissions - a cold engine pollutes alot, until the converters warm up.
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