Hissing noise when I accelerate - Mercedes-Benz Forum
 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 06-22-2018, 08:04 AM Thread Starter
BenzWorld Newbie
 
Date registered: Jun 2018
Posts: 1
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
(Thread Starter)
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

Thanks!
babypbenz is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 06-22-2018, 03:12 PM
BenzWorld Member
 
Date registered: Mar 2008
Vehicle: 1998 , SLK 230
Location: Melbourne, Australia
Posts: 208
Mentioned: 0 Post(s)
Quoted: 27 Post(s)
This is the R170 forum for older SLK's. If it was my 1998 model I'd make sure the top was securely replaced on the filter airbox, and check the hoses around the airbox.

But you might get a better answer on your model's section of Benzworld.
Mike C 3039 is offline  
post #3 of 6 (permalink) Old 07-18-2018, 05:13 AM
BenzWorld Member
 
rpiotro's Avatar
 
Date registered: Sep 2007
Vehicle: 2012 SLK350
Location: 4257'34"N 8803'05"W
Posts: 398
Mentioned: 0 Post(s)
Quoted: 5 Post(s)
Quote:
Originally Posted by Mike C 3039 View Post
This is the R170 forum for older SLK's. If it was my 1998 model I'd make sure the top was securely replaced on the filter airbox, and check the hoses around the airbox.

But you might get a better answer on your model's section of Benzworld.
This IS the R172 forum. Where are YOU?
rpiotro is offline  
Sponsored Links
Advertisement
 
post #4 of 6 (permalink) Old 07-18-2018, 05:17 AM
BenzWorld Member
 
rpiotro's Avatar
 
Date registered: Sep 2007
Vehicle: 2012 SLK350
Location: 4257'34"N 8803'05"W
Posts: 398
Mentioned: 0 Post(s)
Quoted: 5 Post(s)
Quote:
Originally Posted by babypbenz View Post
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

Thanks!
I would have to hear the car to make a determination. Those kinds of sounds are consistent with a turbocharged engine. Best take it back to your mechanic that did the work for a second opinion.

BTW, what is "German oil"?
rpiotro is offline  
post #5 of 6 (permalink) Old 07-23-2018, 04:27 AM
BenzWorld Member
 
Date registered: Dec 2007
Vehicle: 2011 E 350 4matic
Location: Monroe Ct
Posts: 239
Mentioned: 0 Post(s)
Quoted: 21 Post(s)
I'm not a mechanic but, agree, "Those kinds of sounds are consistent with a turbocharged engine." The turbocharger forces air into the engine and is driven by the exhaust. the more exhaust the faster the turbo spins the more air forced in the engine. When the oil was changed maybe something was moved or disconnected.
rpiotro likes this.
B15M is offline  
post #6 of 6 (permalink) Old 02-05-2019, 05:24 AM
BenzWorld Member
 
Date registered: Dec 2011
Vehicle: 82 380SL. Past: 75 450SL, 59 TR3A, 64 TR4, 66 250SL, 69 280SE, 75 450Sl, 79 450SEL
Location: Phoenix
Posts: 245
Mentioned: 1 Post(s)
Quoted: 8 Post(s)
I have the same car in Arizona. The car is turbocharged. To reduce, but not entirely eliminate turbo lag, the turbo is constantly spinning (at about 80% and spins faster on acceleration). Mine hisses on acceleration. When I don’t want to enjoy the hissing sound, I turn the radio up.
rpiotro likes this.
sdichter is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Roadster Forums > R172 SLK-Class

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 

Title goes here

close
video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome