Initial sucking and whining sound on startup but not air pump - Mercedes Benz SLK Forum

SLK R171 General Discussion SLK 200, SLK 280, SLK 300, SLK 350, SLK 55 AMG

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#1 Old 1 Week Ago
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Initial sucking and whining sound on startup but not air pump

Hey all

So after researching on the forums that the start up whining was from the secondary air pump, I have discovered its not that. On start up I noticed that besides the whining there is a sucking/pulsing sound coming from manifold area which lasts for about 15-20 seconds.
I have had the engine check light on since I bought the car a few months back and the code was a P401 for the air pump. On disassembling this week I have discovered it is damaged internally and needs to be replaced so its definitely not the air pump that was making the noise as its still there!
Once the noise disappears I have noticed a ticking sound, but upon close inspection it sounds like it comes from the fuel rail?
Are these noises normal? The car has 160000 KM on it.

Many thanks
Gman555 is offline  
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