Whistling noise and high crack case vacuum

kylerwinters · 12-12-2017, 01:44 PM

Hi guys. I have a 335i and I have had a whistling noise get worse and worse. For a while I thought my transmission was going out. That was my thought until I tried to add oil when it was running. The oil fill cap wouldn't open, it was stuck! I pried on it and it opened with a swoosh of air and the whistling noise went away. This video exactly describes my situation. What failure could be causing this? I just replaced my valve cover but neglected to replace my pcv valve.

Edit: here is a video of my engine. Link

RocketSurgeon · 12-13-2017, 02:21 AM

That's an unusual problem. It could be caused by a bad PCV valve, or a damaged valve cover. I would check the PCV first.

mfractal · 12-13-2017, 03:20 AM

Yep. Sounds like a pcv valve gone bad.
BTW - Extremely common on VAG TFSI engines with same symptoms. Just had this happen to my Q5.

mojobmw_e90 · 12-13-2017, 06:47 AM

Bad pcv valve or the if you have the rb pcv valve male sure the rubber peace is in there. If not that will causes issues. I have had it happen to me

Rob@RBTurbo · 12-13-2017, 08:25 AM

Quote:

Originally Posted by mojobmw_e90

Bad pcv valve or the if you have the rb pcv valve male sure the rubber peace is in there. If not that will causes issues. I have had it happen to me

Definitely sounds like the PCV Valve and we'd also suggest a new vent hose/flapper assembly as well.

Regarding our PCV valve the above user likely had our earlier valve offering which we refer to as the "Grommet Style". These were the same actual valve and did well but the Grommet could separate especially if tinkered with often and would need resealing if it did. So over 2 years ago we revised the RB Valves adapter to an OEM like "O-Ring style" that installs nicer and they seem to be very bullet proof even when serviced regularly. In short that shouldn't have been any issue for quite a long time now.

Rob

mojobmw_e90 · 12-14-2017, 07:58 AM

Quote:

Originally Posted by Rob@RBTurbo

Definitely sounds like the PCV Valve and we'd also suggest a new vent hose/flapper assembly as well.

Regarding our PCV valve the above user likely had our earlier valve offering which we refer to as the "Grommet Style". These were the same actual valve and did well but the Grommet could separate especially if tinkered with often and would need resealing if it did. So over 2 years ago we revised the RB Valves adapter to an OEM like "O-Ring style" that installs nicer and they seem to be very bullet proof even when serviced regularly. In short that shouldn't have been any issue for quite a long time now.

Rob

Damn been that long since I did my pcv valve lol.. Might be time to replace mine. Only got like 10k on it hehe

kylerwinters · 12-14-2017, 08:04 PM

Thank you guys for the responses. I'll try replacing the pcv valve and possibly the vent hose along with it if I'm not strapped for cash. Could this cause misfires?

Sgop335 · 12-15-2017, 12:43 PM

Quote:

Originally Posted by Rob@RBTurbo

Definitely sounds like the PCV Valve and we'd also suggest a new vent hose/flapper assembly as well.

Regarding our PCV valve the above user likely had our earlier valve offering which we refer to as the "Grommet Style". These were the same actual valve and did well but the Grommet could separate especially if tinkered with often and would need resealing if it did. So over 2 years ago we revised the RB Valves adapter to an OEM like "O-Ring style" that installs nicer and they seem to be very bullet proof even when serviced regularly. In short that shouldn't have been any issue for quite a long time now.

Rob

Rob, I have the old style valve. Do you recommend I get your new one with the o-ring? it is a better design.

Rob@RBTurbo · 12-15-2017, 02:44 PM

Quote:

Originally Posted by Sgop335

Rob, I have the old style valve. Do you recommend I get your new one with the o-ring? it is a better design.

Both are same valves the newer O-ring style is just more "tamper" resistant. If you think the grommet of the older style has come unsealed (which usually only happens when removing after having been installed- if at all); you can either reseal it or order the complete new style. With time and age of course it is worth replacing them in general- they are a maintenance item after all.

Thanks,
Rob

Sgop335 · 12-15-2017, 06:17 PM

Quote:

Originally Posted by Rob@RBTurbo

Both are same valves the newer O-ring style is just more "tamper" resistant. If you think the grommet of the older style has come unsealed (which usually only happens when removing after having been installed- if at all); you can either reseal it or order the complete new style. With time and age of course it is worth replacing them in general- they are a maintenance item after all.

Thanks,
Rob

Yes it has come unsealed. Will order one. The oring is a better design.
It is interesting to see another player the bms pcv.

12-12-2017, 01:44 PM	#1
kylerwinters New Member 10 Rep 24 Posts Drives: E92 335xi Join Date: Jan 2017 Location: USA iTrader: (0)	Whistling noise and high crack case vacuum Hi guys. I have a 335i and I have had a whistling noise get worse and worse. For a while I thought my transmission was going out. That was my thought until I tried to add oil when it was running. The oil fill cap wouldn't open, it was stuck! I pried on it and it opened with a swoosh of air and the whistling noise went away. This video exactly describes my situation. What failure could be causing this? I just replaced my valve cover but neglected to replace my pcv valve. Edit: here is a video of my engine. Link Last edited by kylerwinters; 12-12-2017 at 01:51 PM.. Reason: Adding link to video
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12-13-2017, 02:21 AM	#2
RocketSurgeon Lieutenant 264 Rep 459 Posts Drives: 2008 135i Manual, CBR650F Join Date: Jan 2017 Location: NC iTrader: (0)	That's an unusual problem. It could be caused by a bad PCV valve, or a damaged valve cover. I would check the PCV first.
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12-13-2017, 03:20 AM	#3
mfractal VAG Survivor $mfractal's Avatar$ 40 Rep 150 Posts Drives: E90 335i Join Date: Aug 2015 Location: BR iTrader: (1)	Yep. Sounds like a pcv valve gone bad. BTW - Extremely common on VAG TFSI engines with same symptoms. Just had this happen to my Q5. __________________ F10 535i LCI, Hybrid Turbo, Custom Inlet, Spool FX-150 Pump HPFP, TI Automotive LPFP, DV+, Phoenix IC, FTP CP, High Flow Cat, M5 Mufflers, Custom Tuned By David Shoup.
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12-13-2017, 06:47 AM	#4
mojobmw_e90 Major 380 Rep 1,497 Posts Drives: 2014 E63S Join Date: Oct 2014 Location: Chicago IL iTrader: (3)	Bad pcv valve or the if you have the rb pcv valve male sure the rubber peace is in there. If not that will causes issues. I have had it happen to me
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12-14-2017, 08:04 PM	#7
kylerwinters New Member 10 Rep 24 Posts Drives: E92 335xi Join Date: Jan 2017 Location: USA iTrader: (0)	Thank you guys for the responses. I'll try replacing the pcv valve and possibly the vent hose along with it if I'm not strapped for cash. Could this cause misfires?
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