Date registered: Jun 2018
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Hissing noise when I accelerate
Hi, I recently had routine maintenance performed on my 2014 SLK250 Carbon Edition, and ever since then everytime I *release* the accelerator the car makes a hissing sound. It sounds like someone is opening a bottle of soda. If I accelerate a little, when I release the accelerator it hisses a short 'ppsss', if I accelerate quickly for example while merging onto the freeway, when I release the accelerator it makes a hissing sound which is a bit longer. The loudness of the hissing does not vary. I believe the engine is 4 cylinder Turbo.
I purchased the car used, and did not notice any such noise when I bought it, or over the past 6 months that I have been driving it. I am wondering, is the hissing sound normal? Does it have something to do with the turbo? Did my mechanic fix something that I didn't know needed fixing?
My mechanic performed the following actions:
1. changed the air filter
2. changed the oil, used good German oil
3. changed the brake pads, replaced with new Mercedes brakes pads
4. rotated the wheels