CLK200 Noisy on start up

[AAPete]

When I start the car (Petrol) sounds really raspy like an exhaust blowing
once driving for a matter of minutes it sounds nice and smooth any ideas?
The car is only 2 years old....

 

[molar]

My CLK 230K is the same. I am assuming it is normal.

 

[landover]

It may be a leaking joint and when warm it expands and seals.

Check all joints for any sign of black sooty deposits.

This will let you know if there is a leak hope this helps. :idea:

 

[69Coupe]

This is actually normal, it is the auxilary air pump which is used to lower emissions when the engine is cold and using a richer mixture.

 

[piestore]

hi

Hi

69coupe is dead right its due to secondary air injection, if you lift the bonnet then fire the angine up (from cold) and stand next to the engine and listen you will hear the exhaust blowing noise as described for between 30 secs and 1 minute it will then switch off and the engine goes quite