Help me fix this please !
Thread Starter
Newbie
Joined: Nov 2024
Posts: 1
Likes: 0
Help me fix this please !
2013 Mercedes C-300 4matic
CODES : P0507 P2279
-LOUD SQUEALING SOUND AFTER WARM UP
-NOISE WILL GO AWAY WHEN OIL CAP REMOVED (feels like high suction at oil cap)
Should I replace the centrifugal cover behind the engine passenger side ? Easy job
or should I remove entire intake manifold and replace ventilation pcv valve ? Hard job
CODES : P0507 P2279
-LOUD SQUEALING SOUND AFTER WARM UP
-NOISE WILL GO AWAY WHEN OIL CAP REMOVED (feels like high suction at oil cap)
Should I replace the centrifugal cover behind the engine passenger side ? Easy job
or should I remove entire intake manifold and replace ventilation pcv valve ? Hard job
Out Of Control!!
Joined: Apr 2019
Posts: 11,812
Likes: 6,707
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
2013 Mercedes C-300 4matic
CODES : P0507 P2279
-LOUD SQUEALING SOUND AFTER WARM UP
-NOISE WILL GO AWAY WHEN OIL CAP REMOVED (feels like high suction at oil cap)
Should I replace the centrifugal cover behind the engine passenger side ? Easy job
or should I remove entire intake manifold and replace ventilation pcv valve ? Hard job
CODES : P0507 P2279
-LOUD SQUEALING SOUND AFTER WARM UP
-NOISE WILL GO AWAY WHEN OIL CAP REMOVED (feels like high suction at oil cap)
Should I replace the centrifugal cover behind the engine passenger side ? Easy job
or should I remove entire intake manifold and replace ventilation pcv valve ? Hard job
It does sound like it's the failed PCV that needs replacement. This is a standard failure of plastics under extreme heat.
MBWorld Fanatic!
Joined: Jun 2014
Posts: 1,084
Likes: 440
From: Melbourne, Australia
2010 ML550 VIN WDC1641722A564750, 2010 B180
PO507 is Engine idle speed higher than expected?
P2279 Intake Air System Leak?
I'd start with looking for vaccum leakes given the P2279 and a smoke test would assit with that. There's a chance you have 2 seperate issues happening at the same time - Too much blow by caused by PCV not functioning and then a vaccum leak as well. Does the fuel trim data show anything that looks like a lean mixture? I'd try and reoving as many variables as possible first - clean the MAF sensor as a priority. Check your O2 sensors to sse what voltage they are throwing out and then maybe the EGR after that.
Noting the P0507 - have you noticed anything with the idle speed?
Replacing the centrifigal valve on the back of the head should be a maintenace item anyway, and is reasonably inexpensive. If you need to then replace anything further on that system, you'll want to change the centrifigal valve anyway.
P2279 Intake Air System Leak?
I'd start with looking for vaccum leakes given the P2279 and a smoke test would assit with that. There's a chance you have 2 seperate issues happening at the same time - Too much blow by caused by PCV not functioning and then a vaccum leak as well. Does the fuel trim data show anything that looks like a lean mixture? I'd try and reoving as many variables as possible first - clean the MAF sensor as a priority. Check your O2 sensors to sse what voltage they are throwing out and then maybe the EGR after that.
Noting the P0507 - have you noticed anything with the idle speed?
Replacing the centrifigal valve on the back of the head should be a maintenace item anyway, and is reasonably inexpensive. If you need to then replace anything further on that system, you'll want to change the centrifigal valve anyway.
Last edited by BlackML550; Dec 2, 2024 at 06:43 AM.
Super Member
Joined: May 2024
Posts: 503
Likes: 121
From: Northern Indiana
2014 c300 w204.080 3.5 v6
Yes the squeal is from a failed centrifugal valve also called pcv system. It has a diaphragm that will tear and squeel terrible when warm. Fix that and three squeal will be gone
