2014 E350 PCV issue?
Thread Starter
Newbie
Joined: Aug 2022
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2014 E350 Cabriolet
2014 E350 PCV issue?
Hi all!
I had a quick question about the PCV/CCV system on my 2014 MB E350 Convertible M276 engine. 91k miles.
I noticed that I have a medium/heavy vacuum suction at my oil filler cap. Is this normal? I placed a tissue over it with the engine warmed up and it did create a suction. I can actually hear it sucking in from the cap, like a vacuum. I have no visible leaks or fluid on the ground to indicate clogging. Engine runs strong. I saw some people saying that having any vacuum at the oil filler cap was bad, but I always thought this was normal? Am I missing something? Is this indicate of a clogged CCV system? Any insight would be appreciated. Thanks!
Timothy
I had a quick question about the PCV/CCV system on my 2014 MB E350 Convertible M276 engine. 91k miles.
I noticed that I have a medium/heavy vacuum suction at my oil filler cap. Is this normal? I placed a tissue over it with the engine warmed up and it did create a suction. I can actually hear it sucking in from the cap, like a vacuum. I have no visible leaks or fluid on the ground to indicate clogging. Engine runs strong. I saw some people saying that having any vacuum at the oil filler cap was bad, but I always thought this was normal? Am I missing something? Is this indicate of a clogged CCV system? Any insight would be appreciated. Thanks!
Timothy
Out Of Control!!
Joined: Sep 2018
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From: unbegrenzt
2017 GLE350 4MATIC
Seems in the realm of normal. Do you have check engine light, misfire or missing at idle?
Read below.
https://mbworld.org/forums/glk-class...m-oil-cap.html
Read below.
https://mbworld.org/forums/glk-class...m-oil-cap.html
Thread Starter
Newbie
Joined: Aug 2022
Posts: 3
Likes: 1
2014 E350 Cabriolet
No CEL, misfire, or anything else. Seems to be normal. Just read some conflicting things haha. I remember thinking vacuum was normal. I have a 97 Volvo that’s notorious for PCV clogging and the telltale sign is when you put a baggie or a glove over the oil cap and it inflates, when it is supposed to suck in.
Junior Member
Joined: Jan 2014
Posts: 18
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From: Toronto, Canada
2013 E350 4-Matic, 2008 B200 (sold), 1998 E200K, 1983 200
Late to the party, but for others stumbling upon this thread:
Some vacuum at the cap is normal. Too much vacuum is if you have trouble removing the cap because you have that much vacuum. Also, a whistling sound that goes away when you remove the cap is another sign. Usually means the oil separator at the back of the camshaft on the passenger side (left hand drive) has the small internal seal worn. Not the o-ring at the housing. That usually leaks oil if bad.
Some vacuum at the cap is normal. Too much vacuum is if you have trouble removing the cap because you have that much vacuum. Also, a whistling sound that goes away when you remove the cap is another sign. Usually means the oil separator at the back of the camshaft on the passenger side (left hand drive) has the small internal seal worn. Not the o-ring at the housing. That usually leaks oil if bad.
