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wolfusor wolfusor is offline
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Default Intake/boost leak inside the valve cover - 04-28-2019, 10:00 PM

2007 n54. No fault codes, just slow very boost build up and some overboost when off the gas pedal. I've set up the system for boost/intake leak test (Little to no boost? Read this thread first... - N54Tech.com - International Turbo Racing Discussion), capped the PCV pipe. As soon as start pumping in pressure, I can hear hissing sound coming from inside the engine valves cover, more audible when I open the oil cap. Any ideas would be appreciated.


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arkie6 arkie6 is offline
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Default 05-16-2019, 11:16 AM

Maybe the PCV valve inside the valve cover is leaking? Either that or the valve cover gasket around the intake PCV ports is leaking or the valve cover is cracked.
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wolfusor wolfusor is offline
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Default 05-17-2019, 12:52 PM

Thanks for your reply arkie6.
It's weird that I put a decent amount of smoke inside and for the life of me couldn't see where it comes out. It doesn't come through the oil cap and not even through the exhaust. I suspect it may be the rear turbo inlet hose that's hard to see. Will take down ********* for better visibility and repeat the process. If it's the valve cover gasket or PCV valve leak, wouldn't there be other symptoms? The only things I can complain now is slow spool and periodically idle is a little rough


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iminhell1 iminhell1 is offline
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Default 05-17-2019, 01:35 PM

What I assume you're hearing is the air going through the head ports,

PCV, how does the block breath? - N54Tech.com - International Turbo Racing Discussion


2010 135i auto, MHD E40 tune, Fuel-It stg 2 pump, best 1/4 mile 11.863 @ 119.17 mph
new mods this year, VRSF 5" stepped IC, RB EVO inlets, CP-e/Tial CP, 1320 **'s, xhp stg 3 trans tune, E-85 tune
Best 1/8 mile: 7.469 @ 98.56, 1.769 60'
Best 1/4 mile: 11.480 @ 121.79 1.802 60'
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wolfusor wolfusor is offline
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Default 05-17-2019, 11:28 PM

This PCV and valve cover stuff is all new to me so it'll be a while until I make sense of it. I wonder why there is no mentioning about it in this tread about boost leak testing?
Little to no boost? Read this thread first... - N54Tech.com - International Turbo Racing Discussion
Am I the only one who has this problem?


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E92 MT
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Turbohugh Turbohugh is offline
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Default 05-19-2019, 09:55 AM

Quote:
Originally Posted by iminhell1
What I assume you're hearing is the air going through the head ports,

PCV, how does the block breath? - N54Tech.com - International Turbo Racing Discussion
Don't those ports cycle back to the intake tract ? If so if a valve is open you would hear it .. Depending on the position of the cams you could get that if I'm understanding our PCV system correctly. (Which I hate btw)
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wolfusor wolfusor is offline
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Default 05-19-2019, 11:58 AM

I keep reading about it but all the info about PCV is scattered around and controversial. Wish there was a post that explains it in details starting with basics.


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Turbohugh Turbohugh is offline
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Default 05-19-2019, 01:33 PM

Try this..

Start at page 10
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File Type: pdf 2007 ENGINE MECHANICAL.pdf (528.2 KB, 19 views)
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Domino_86 Domino_86 is offline
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Default 05-24-2019, 07:56 PM

You will need to plug the head ports. My rear main seal pushed itself out rubbing the flywheel. And I'm pretty sure the pressure ruined my oil pan gasket as well. What I have done to fix the prob is plugged the head ports and run an external pcv by RB. But since you're pulling the valve cover might as well replace it. Another option in addition with plugging the ports is to run the Vader Solutions pcv plug and Vader solutions occ. BMS is coming out with their setup as well. One of those three will work but plugging the ports will stop over pressurization of the crankcase.
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wolfusor wolfusor is offline
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Default 05-25-2019, 09:39 AM

Thanks Domino_86. I only ran map1 Jb4 so far. At this time did't notice any oil leaks and was thinking to deal with the crankcase pressure later. But since plugging ports and the external OCC doesn't cost that much, i might as well do it and save myself some headache further down the road.


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