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 Old 09-10-2011, 05:39 PM   #1
 
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Default Boost leak at this sensor by oil cap??

I was doing a boost leak test on my car today and had a few small holes around some of the welds in my intake. I jb welded them and fixed the holes. After I fixed the holes a new leak occured and not sure if this is normal or not but there is a sensor next to the oil cap and connections to the first ignition coil and tons of air is coming through this when i charge my system up to about 15psi. Is this normal or not?

I've attached a picture of the sensor. It leaks air weather the sensor is plugged in or left unplugged. If this needs to be replaced what is the part number and what is this sensor called? No clue why it's leaking air because it wasn't leaking earlier today and now it is.

Is it safe to drive my car with this leak? There's a pretty significant amount of air coming through there.

Picture attached.
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File Type: jpg boostleak.jpg (82.2 KB, 108 views)
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 Old 09-10-2011, 05:40 PM   #2
 
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you are not supposed to fill the valve cover with pressurized air or am i missing something
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 Old 09-10-2011, 05:42 PM   #3
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how did you manage to pressurize your crankcase?
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 Old 09-10-2011, 05:43 PM   #4
 
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**whether
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 Old 09-10-2011, 05:46 PM   #5
 
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no clue why there is air in there. I hooked up the boost leak tester I made the end of my intake. I removed the filter and connected it there and pressurized the system. Ive been testing all morning and part of the afternoon repair a bunch of small hair pin holes all over my cp-e CAI around the MAF sensor. I had 2 clamps that were loose but majority were around the MAF sensor on my CAI.

If the crankcase is pressurized is that bad? Maybe i've done to many tests and it's entered that part of the engine, not exactly sure. How else would it get in there?
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 Old 09-10-2011, 05:48 PM   #6
 
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its fine, mine does that too, not from that sensor, but you have the breather on the back of the cover for that specific reason. you may want to put a new gasket on that sensor if you can get one, but i wouldnt stress about it
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 Old 09-10-2011, 05:50 PM   #7
 
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Originally Posted by TWOptSL0W View Post
its fine, mine does that too, not from that sensor, but you have the breather on the back of the cover for that specific reason. you may want to put a new gasket on that sensor if you can get one, but i wouldnt stress about it
what about the crankcase getting air in it, is that a problem? Like I said this never started happening until after all of my other boost leaks were fixed.
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 Old 09-10-2011, 05:53 PM   #8
 
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yea im not sure why it happens. sometimes i get it sometimes i dont. it could be through the pcv system
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 Old 09-10-2011, 06:00 PM   #9
 
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ok cool
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 Old 09-10-2011, 06:02 PM   #10
 
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you should plug the bpv hose
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 Old 09-10-2011, 06:18 PM   #11
 
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Originally Posted by bmorrisj View Post
you should plug the bpv hose
Ya I did take it off the bpv but i didn't have anything laying around to plug it. I need to find something to plug it. I want to test my bpv to make sure it's not leaking as well. I have the HKS SSQV2 which are known to leak. I'll test that another time once I have something to plug the recirc hose.
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 Old 09-10-2011, 06:24 PM   #12
 
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Cap the valve cover vent line while testing.
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 Old 09-10-2011, 06:36 PM   #13
 
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Originally Posted by kmac View Post
Cap the valve cover vent line while testing.
Where is that at?
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 Old 09-10-2011, 06:40 PM   #14
 
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On the intake, the hose that goes from the intake to the valve cover.
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 Old 09-10-2011, 07:08 PM   #15
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Originally Posted by kmac View Post
On the intake, the hose that goes from the intake to the valve cover.
exactly. When you put the damn cap on the end of your intake, you were pressurizing the crankcase too via the breather from the intake to the vc.

Leak testers are best on the compressor inlet at least, but the best best is the beginning of the hot side piping at the compressor outlet.
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 Old 09-10-2011, 07:23 PM   #16
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lulz, start the car see wat happens
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 Old 09-11-2011, 10:48 AM   #17
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The valve cover PCV valve is designed to block air from being sucked back into the crankcase, it is not designed to block air from being blown into the crankcase from the intake because that area never sees boost.

You need to block off the valve cover breather hose, it is the big hose near the CDFP that goes to the intake.

If you are only leak testing the hot side and you pressureized the crankcase to the point that the oil control valve started leaking then I would say you have a bad crankcase PCV and a bad valve cover PCV.
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 Old 08-12-2015, 10:21 AM   #18
 
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anyone know if there is a writeup on replacing that seal? also would like to know the part number...
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 Old 08-12-2015, 11:38 AM   #19
 
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 Old 09-08-2015, 07:26 AM   #20
 
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I had the same issue with the same seal. It's nothing to worry about. Just cap off the vc when your testing for leaks. Even if you replace that seal it'll still leak.

If you still want to replace it you can buy a oem replacement seal from edge. I don't know the part number off hand.

Replacing the seal is pretty straightforward as well. Just take the valve cover off, pull the sensor out, then you can pop the old seal out and swap it with the new one.
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 Old 09-08-2015, 11:35 AM   #21
 
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Originally Posted by toosavage86 View Post
If you still want to replace it you can buy a oem replacement seal from edge. I don't know the part number off hand.
Don't even bother replacing it. After a while it will stop leaking. But it takes a while before all that oil becomes like a gunky glue and seals the seal (!!).
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