Loose Vacuum Line Causing Rough Idle?
Thread Starter
Newbie
Joined: Dec 2016
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CLK320
Loose Vacuum Line Causing Rough Idle?
Hey there, this is a wonderful first post to make, but my CLK320 is currently idling rather roughly as well as shaking at low speeds, this has happened once before but I'd rather not run back to the dealership just for them to tighten a hose back up again.
When the car is running there's an audible hissing noise towards the windshield/headlamp washing fluid container and I just wanted to see if someone might be able to walk me through a hopefully easy fix.
When the car is running there's an audible hissing noise towards the windshield/headlamp washing fluid container and I just wanted to see if someone might be able to walk me through a hopefully easy fix.
MBWorld Fanatic!
Joined: May 2015
Posts: 4,037
Likes: 1,011
From: Miami, FL
2003 CL 600
Check back in that area, there are hoses that run from the rear of the valve covers to just below the throttle body for PCV functions. They get oil on them and degrade, or just get old and hard and crack, and allow air to leak in after the TB and cause the rough running. Get in there and see where exactly the hissing is coming from, you will find a broken hose most likely. Replace it and see if it gets better.
MBWorld Fanatic!
Joined: Sep 2016
Posts: 1,189
Likes: 187
From: TX
2023 GLE3502W, 2024 GLC3002W, 1967 Pontiac GTO 4 sp (sold...sniff)
Check back in that area, there are hoses that run from the rear of the valve covers to just below the throttle body for PCV functions. They get oil on them and degrade, or just get old and hard and crack, and allow air to leak in after the TB and cause the rough running. Get in there and see where exactly the hissing is coming from, you will find a broken hose most likely. Replace it and see if it gets better.
Senior Member
Joined: Apr 2016
Posts: 279
Likes: 36
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Mine also has developed quite the hiss around the throttle body. Is yours similar?
