Dickster
MB Enthusiast
Hi there,
I've had my SL55 since May 2019, and hadn't really stretched its legs until recently.
So, it practically redlined through the gears, and was running great. Then all of a sudden it changes up a gear, then back down, and appeared to be down on power.
At the same time I hear a continuous "whooshing noise", not unlike air escaping from a tyre - I had the window slightly open.
I slow down. Gradually, the noise disappears. Now, under 30 mph I got no noise. But over 30/35 I get a regular release of air from somewhere - the intermittent release increases with speed.
Otherwise, the car starts and runs fine. No warning lights.
The sound is not quite the same as a wastegate, but that's the nearest I can think of.
Any ideas? Bypass valve?
I did think it was a split hose, but note that the intercooler is W/C!!
Thanks
Rich
I've had my SL55 since May 2019, and hadn't really stretched its legs until recently.
So, it practically redlined through the gears, and was running great. Then all of a sudden it changes up a gear, then back down, and appeared to be down on power.
At the same time I hear a continuous "whooshing noise", not unlike air escaping from a tyre - I had the window slightly open.
I slow down. Gradually, the noise disappears. Now, under 30 mph I got no noise. But over 30/35 I get a regular release of air from somewhere - the intermittent release increases with speed.
Otherwise, the car starts and runs fine. No warning lights.
The sound is not quite the same as a wastegate, but that's the nearest I can think of.
Any ideas? Bypass valve?
I did think it was a split hose, but note that the intercooler is W/C!!
Thanks
Rich