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Probably leaking boost. What now?

Gkivoo

Ready to race!
So I just went through a tunnel and my foot got a little heavy and I noticed a sound I've never heard before. It's right after boost peaks and it sounds as if it can't hold max pressure and I hear this hissing noise coming from the car (maybe passenger side?). I don't feel any difference in performance but then again I just noticed it now and that was about 2 minutes away from my house.

How can I go about figuring out where it's coming from and pinpointing the part that's either leaking boost or causing the noise if it's not a boost leak?

I did notice my coolant level was at the Min when I got home but I've been slowly losing coolant for over a year now, topping it off from min to max every few months.

I'm APR stage 2 with Rev D diverter valve, APR downpipe and magnaflow catback, APR stage 1 intake. I don't have an analog boost gauge I only have the p3cars plugged into the OBD2. I also don't have much money right now so I'm trying to troubleshoot this myself rather than spending a fortune on smoke testing and what not.

Here's a video of my car where you can kind of hear the sound it's making.


Updated video:

https://youtu.be/gQ4uY9RDo7E


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Last edited:

FriggenT1

Banned
Your coolant? It's possible the coolant line from the turbo could be leaking slowly, is there anywhere you can see the coolant that has leaked?

https://youtu.be/jh012YKnMP0

There's a video of the hissing sound this guy had, I cannot tell from your video, but does it sound like this?
 
Last edited:

Gkivoo

Ready to race!
Your coolant? It's possible the coolant line from the turbo could be leaking slowly, is there anywhere you can see the coolant that has leaked?

https://youtu.be/jh012YKnMP0

There's a video of the hissing sound this guy had, I cannot tell from your video, but does it sound like this?



No it definitely doesn't sound like this. It's only audible after a second or two of holding max boost and it sounds like a hissing/whistling sound not so much a rattle like the video you just sent.


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Laimface

Ready to race!
Check your turbo outlet flange, could be pissing boost like mine does:

 

FriggenT1

Banned
Update.. better video through a tunnel.

https://youtu.be/gQ4uY9RDo7E


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It's very hard to tell...what does your boost gauge doing? No way of logging? Typical leaks come from the TOP to the intercooler pipe connection. The clips are just junk imo, if the leak is significant, even at idle soapy water may bubble. I would check there first....you can look straight down on the left side under the hood and spray it with a good light. Check. If not, you may have to just have a pressure test done or do one yourself
 

Gkivoo

Ready to race!
Uhhh so I topped off my coolant and it's not making the noise anymore [emoji19]


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maine-mk6

Passed Driver's Ed
Very strange, subd.
 

Laimface

Ready to race!
Soapy water and a boost leak tester

That's the one. I put the leak tester on the back half of the intake pipe (took the accordion pipe off after the MAF housing) and capped the PCV hose point.

I only dared take the pressure to 15PSI, the bubbles in the video were at 5 PSI as the pressure was going down so fast. This was the only place bubbles came from so when I get it fixed I should get a good bump in power / reduction in surge!
 

Gkivoo

Ready to race!
So this noise is back. I wish it wasn't so cold out so I can get under the car and start testing for a boost leak


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