PCV needed?

Moe1 · 03-22-2015, 05:03 PM

When I open the oil cap, and put a bag over it the bag is getting sucked in.

Am I right in thinking That, i need a new pcv?

Any idea where I can order it from?

old grey steve · 03-22-2015, 05:20 PM

Moe sounds like you've sure got a breather valve issue they aren't unheard of and we've got a 325i in for the same issue tomorrow which we looked at te other day. On that car you pull the dip stick partly out the tube open tge filler cap and the car cuts out.

You replace the valve but I'd also replace the pipes as well (they'll be 3 or 4 pipes) the whole lot from BMW costs around £113+VAT.

Moe1 · 03-22-2015, 05:23 PM

Quote:

Originally Posted by old grey steve

Moe sounds like you've sure got a breather valve issue they aren't unheard of and we've got a 325i in for the same issue tomorrow which we looked at te other day. On that car you pull the dip stick partly out the tube open tge filler cap and the car cuts out.

You replace the valve but I'd also replace the pipes as well (they'll be 3 or 4 pipes) the whole lot from BMW costs around £113+VAT.

Do you have a part number? For the valve and pipes too?

It has an electronic dipstick only.

old grey steve · 03-22-2015, 05:29 PM

Quote:

Originally Posted by Moe1

Do you have a part number? For the valve and pipes too?

It has an electronic dipstick only.

the 325 we are getting in is an older unit but still suffers the same issues they have done for years I don't know the part numbers Moe off hand but a call to the local dealer asking for breather valve and pipes will guve you the answer.

Or using www.bmwfans.info/ put the last 7 digits of your chassis in on the parts catalogue icon on the top left then you'll be able to see the necessary diagram with part numbers

Moe1 · 03-22-2015, 05:39 PM

Quote:

Originally Posted by old grey steve

the 325 we are getting in is an older unit but still suffers the same issues they have done for years I don't know the part numbers Moe off hand but a call to the local dealer asking for breather valve and pipes will guve you the answer.

Or using www.bmwfans.info/ put the last 7 digits of your chassis in on the parts catalogue icon on the top left then you'll be able to see the necessary diagram with part numbers

Thanks mate, I have the part numbers now. Will be ordering tomorrow

essex_lad · 03-22-2015, 06:22 PM

I never knew this was an issue, wen I take my oil cap off my car sounds like it's goin to stall. Do I need to get this sorted then?

Robin330i · 03-22-2015, 07:03 PM

When you take the oil cap off it should suck in air as the crankcase should always be in depression, it's a legal requirement that all engines have a negative crankcase pressure.

The PCV is there to regulate the amount of depression - how much depression varies with different engines but the ones I develop at work run at -25mBar at idle.

By removing the oil cap you are allowing unmetered air to enter the engine which will make it run rough and in some cases will try to stall.

essex_lad · 03-23-2015, 07:10 AM

Well thanks for the detailed description it's always good to take in some new knowledge, thanks. Well glad my car is ok.

dy63 · 03-23-2015, 07:16 AM

when you open the filler cap and pull the dipstick does it rev on its own?

Moe1 · 03-23-2015, 11:15 AM

My car has no dipstick, it has an electronic one, also oil consumption is high too.

03-22-2015, 05:03 PM	#1
Moe1 Private 4 Rep 61 Posts Drives: 330 Join Date: Jan 2015 Location: London iTrader: (0)	PCV needed? When I open the oil cap, and put a bag over it the bag is getting sucked in. Am I right in thinking That, i need a new pcv? Any idea where I can order it from?
	Appreciate 0 Tweet Quote

03-22-2015, 05:20 PM	#2
old grey steve Colonel 283 Rep 2,796 Posts Drives: MK 7.5 Golf R Join Date: Oct 2012 Location: UK in Hertfordshire iTrader: (2)	Moe sounds like you've sure got a breather valve issue they aren't unheard of and we've got a 325i in for the same issue tomorrow which we looked at te other day. On that car you pull the dip stick partly out the tube open tge filler cap and the car cuts out. You replace the valve but I'd also replace the pipes as well (they'll be 3 or 4 pipes) the whole lot from BMW costs around £113+VAT. __________________
	Appreciate 0 Quote

03-22-2015, 06:22 PM	#6
essex_lad Banned 106 Rep 1,562 Posts Drives: E92 Msport N53 Stage 2 Join Date: Jun 2013 Location: Essex iTrader: (0)	I never knew this was an issue, wen I take my oil cap off my car sounds like it's goin to stall. Do I need to get this sorted then?
	Appreciate 0 Quote

03-22-2015, 07:03 PM	#7
Robin330i Lieutenant 36 Rep 512 Posts Drives: E90 330i M Sport Join Date: Jul 2012 Location: Cheshire iTrader: (2)	When you take the oil cap off it should suck in air as the crankcase should always be in depression, it's a legal requirement that all engines have a negative crankcase pressure. The PCV is there to regulate the amount of depression - how much depression varies with different engines but the ones I develop at work run at -25mBar at idle. By removing the oil cap you are allowing unmetered air to enter the engine which will make it run rough and in some cases will try to stall.
	Appreciate 0 Quote

03-23-2015, 07:10 AM	#8
essex_lad Banned 106 Rep 1,562 Posts Drives: E92 Msport N53 Stage 2 Join Date: Jun 2013 Location: Essex iTrader: (0)	Well thanks for the detailed description it's always good to take in some new knowledge, thanks. Well glad my car is ok.
	Appreciate 0 Quote

03-23-2015, 07:16 AM	#9
dy63 Colonel 160 Rep 2,399 Posts Drives: F30 Join Date: Aug 2014 Location: United Kingdom iTrader: (1)	when you open the filler cap and pull the dipstick does it rev on its own?
	Appreciate 0 Quote

03-23-2015, 11:15 AM	#10
Moe1 Private 4 Rep 61 Posts Drives: 330 Join Date: Jan 2015 Location: London iTrader: (0)	My car has no dipstick, it has an electronic one, also oil consumption is high too.
	Appreciate 0 Quote