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Mercedes C230 2005 engine making a noise and shutting off when off the throttle

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Old Dec 23, 2021 | 01:25 PM
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Mercedes C230 2005
Post Mercedes C230 2005 engine making a noise and shutting off when off the throttle

I have a Mercedes C230 2005 and today it started making a weird noise coming from the engine today. Moreover, whenever I am slowing down in traffic or at a stoplight and take my foot off the throttle for few seconds and powers off and I have to put it into park and turn it on again, most mechanics are closed right now due to Christmas holidays so it is not possible to immediately take it.

Issues it had recently that might or might not be related:
Rough idle (RPM unstable), same applies when the car is stopped anywhere or going slowly in traffic
Issues with one of the ignition coils

Any help would be appreciated.
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Old Dec 23, 2021 | 01:59 PM
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not a merc
Check intake for leaks
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Old Dec 23, 2021 | 02:07 PM
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Mercedes C230 2005
I will try to! Is there any other possibility?
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Old Dec 23, 2021 | 11:01 PM
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2005 C230 Kompressor Sedan, 2003 CLK55 AMG, 2021 GLC300
Did it throw any codes? Check engine light on?

In my experience rough idles are typically a vacuum leak which in your car can be in a few different places assuming it's the m271 engine the one that would most difficult would be the PCV which you can do a search on the forum for $12 hose.

Best of luck
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Old Dec 24, 2021 | 08:09 AM
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Check the $12 hose and associated bits.

Read both the link in the thread as well as the link inside the post itself.
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Old Dec 26, 2021 | 01:36 AM
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You need to state engine code to be helped properly. in the case of M271 definitely check valve timing!
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Old Dec 27, 2021 | 04:51 AM
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Mercedes C230 2005
I checked the engine code and there was nothing related to it (check engine light was on because of some electrical stuff related to lightings and ESP), I cleared them and will try to drive it again so I can check it if it comes up. My main issue is the sound coming from the engine, I don't think that it is something minor like just a vacuum leak, I checked the latter and it was fine anyway. I am just afraid to drive it so I don't make things worse
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Old Dec 27, 2021 | 10:26 AM
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Mate! Engine code =Engine number!
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Old Jan 1, 2022 | 04:36 AM
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Mercedes C230 2005
Thanks for the info Russel, got confused and thought it was fault codes.
Anyway, turns out the vanos needed replacement, the mechanic replaced it and it is fine now
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