utc_pyro Posted October 13, 2016 Share Posted October 13, 2016 (edited) Any ideas what's leaking here? http://i.imgur.com/svMdtQd.jpg http://i.imgur.com/U3dERkx.jpg Had the car smoke tested this morning, there was a lot coming out from below the passenger side of the intake manifold near the turbo inlet.. We couldn't see where it was coming from, but it was before the BOV recerc tube but after the BCS. Looking under there with a flashlight didn't show anything obvious, just a crap load of smoke. I'm not the most familure with this area of the intake so I'm not sure if this is something I can fix from the front or if I'll have to take the manifold off. Tech at the shop (firestone) wasn't sure ether. Edit: it was the head ventilation line. Fixed this and the fuel trims went from -6% to +6%. More stuff to be found! Edited October 15, 2016 by utc_pyro Found it! Link to comment Share on other sites More sharing options...
msilin Posted November 20, 2016 Share Posted November 20, 2016 I just got a p0171 this past weekend, turns out my hose was disconnected in pic number 4 . Many Thanks for the write up ! Link to comment Share on other sites More sharing options...
d22597 Posted March 4, 2017 Share Posted March 4, 2017 Trying to smoke test through the small hose on the bov but can't get it to build pressure. All pressure goes directly into the crankcase and out the oil fill. Using very low pressure (2-3lbs). Also can blow into it manually and there is almost no resistance. Am I doing something wrong? Link to comment Share on other sites More sharing options...
iNfEk Posted March 4, 2017 Share Posted March 4, 2017 Trying to smoke test through the small hose on the bov but can't get it to build pressure. All pressure goes directly into the crankcase and out the oil fill. Using very low pressure (2-3lbs). Also can blow into it manually and there is almost no resistance. Am I doing something wrong? You need to cap your intake. Link to comment Share on other sites More sharing options...
iNfEk Posted March 4, 2017 Share Posted March 4, 2017 Any ideas what's leaking here? http://i.imgur.com/svMdtQd.jpg http://i.imgur.com/U3dERkx.jpg Had the car smoke tested this morning, there was a lot coming out from below the passenger side of the intake manifold near the turbo inlet.. We couldn't see where it was coming from, but it was before the BOV recerc tube but after the BCS. Looking under there with a flashlight didn't show anything obvious, just a crap load of smoke. I'm not the most familure with this area of the intake so I'm not sure if this is something I can fix from the front or if I'll have to take the manifold off. Tech at the shop (firestone) wasn't sure ether. Edit: it was the head ventilation line. Fixed this and the fuel trims went from -6% to +6%. More stuff to be found! You need to check each vacuum connection under the intake manifold. Also found a few on the lower connections including the front side vacuum hoses there too. Thought I was looking at my engine bay for a second but don't have the stock TMI and no gold film [emoji23] I would recommend zip tying each hose (I did this) and changing any hoses you cannot squeeze or collapse with your finger when it's disconnected. Link to comment Share on other sites More sharing options...
d22597 Posted March 4, 2017 Share Posted March 4, 2017 You need to cap your intake. Did that! Smoke poring out the oil fill tube like a steam engine (removed oil fill cap before testing). I removed the cap on the intake and some smoke was reaching, but 90% was still coming out of the oil fill. Link to comment Share on other sites More sharing options...
iNfEk Posted March 4, 2017 Share Posted March 4, 2017 Did that! Smoke poring out the oil fill tube like a steam engine (removed oil fill cap before testing). I removed the cap on the intake and some smoke was reaching, but 90% was still coming out of the oil fill. I'm not familiar with your engine. What mods do you have? Link to comment Share on other sites More sharing options...
d22597 Posted March 5, 2017 Share Posted March 5, 2017 I'm not familiar with your engine. What mods do you have? 09 spec.b with Cobb down pipe and tmic. Link to comment Share on other sites More sharing options...
iNfEk Posted March 5, 2017 Share Posted March 5, 2017 09 spec.b with Cobb down pipe and tmic. Wait. You said earlier that you were smoking through the BOV port and not through the intake? When I ran my smoker it was through the intake. If I BLOW with my lungs through the BOV line I cap my intake. Billowing through the oil stick or fill? Link to comment Share on other sites More sharing options...
d22597 Posted March 5, 2017 Share Posted March 5, 2017 Wait. You said earlier that you were smoking through the BOV port and not through the intake? When I ran my smoker it was through the intake. If I BLOW with my lungs through the BOV line I cap my intake. Billowing through the oil stick or fill? I'm running the smoker through bov and with the intake capped, with the oil filler cap removed. If I BLOW with my lungs through the BOV line and my intake capped, air freely goes out the crankcase/oil fill. Link to comment Share on other sites More sharing options...
iNfEk Posted March 5, 2017 Share Posted March 5, 2017 I'm running the smoker through bov and with the intake capped, with the oil filler cap removed. If I BLOW with my lungs through the BOV line and my intake capped, air freely goes out the crankcase/oil fill. I think I'm following. Pressure builds for mine. Are all your vacuum lines stock routing? Hmm. I didn't remove my oil fill though when testing. Maybe that's the difference Link to comment Share on other sites More sharing options...
Fasemelta Posted March 5, 2017 Share Posted March 5, 2017 When was the last time you changed the pcv valve? Maybe it's stuck open allowing more air than normal into the crankcase. When I replaced mine, it was stuck open and I had lots of oil residue in my intake due to that Link to comment Share on other sites More sharing options...
d22597 Posted March 5, 2017 Share Posted March 5, 2017 When was the last time you changed the pcv valve? Maybe it's stuck open allowing more air than normal into the crankcase. When I replaced mine, it was stuck open and I had lots of oil residue in my intake due to that Thanks! Makes sense and was thinking of checking the pcv. I've never checked and currently at 77k miles. Will give that a try. Link to comment Share on other sites More sharing options...
Fasemelta Posted March 5, 2017 Share Posted March 5, 2017 Good luck, it's not an easy job. Grab some worm clamps to replace the OEM clamps that are almost impossible to reuse Link to comment Share on other sites More sharing options...
d22597 Posted March 5, 2017 Share Posted March 5, 2017 Good luck, it's not an easy job. Grab some worm clamps to replace the OEM clamps that are almost impossible to reuse Yeah, and looks like less info available on the later model gen 4s too. Fun! Link to comment Share on other sites More sharing options...
Fasemelta Posted March 6, 2017 Share Posted March 6, 2017 Here's a few resources 1. Always search the forum by using google like this and you'll always get better results. site:legacygt.com *search term* http://legacygt.com/forums/showthread.php?t=95003 This helped me wrap my head around the vacuum/boost concept and routing http://www.iwsti.com/forums/2-5-liter-litre-factory-motor/146699-official-sti-engine-venting-o-separators-catch-cans-thread.html Link to comment Share on other sites More sharing options...
awfulwaffle Posted April 14, 2017 Share Posted April 14, 2017 Question for you guys - people say it's fine to do a boost leak test by pressurizing the inlet, and that their cars hold 20 psi when pressurized this way. I tried the method hunting a misfire, and found a leak somewhere around the boost control solenoid. Wouldn't even hold 5 psi. Smoked it to confirm location. However, when spraying the region with MAF cleaner with the engine running, no discernable change in idle. Is it really a leak, or am i just causing a vacuum connection to leak by reverse pressurizing it during test? Link to comment Share on other sites More sharing options...
iNfEk Posted April 28, 2017 Share Posted April 28, 2017 Question for you guys - people say it's fine to do a boost leak test by pressurizing the inlet, and that their cars hold 20 psi when pressurized this way. I tried the method hunting a misfire, and found a leak somewhere around the boost control solenoid. Wouldn't even hold 5 psi. Smoked it to confirm location. However, when spraying the region with MAF cleaner with the engine running, no discernable change in idle. Is it really a leak, or am i just causing a vacuum connection to leak by reverse pressurizing it during test? Yes. Still a leak. You may not get a change in idle even when spraying certain areas. I would suggest taking that area apart and securing all vacuum lines. I did the same. Mine came from the inlet to hose connections in that area. Some were hard and not sealing. No change in idle either when spraying like you did. Smoke testing shows where a small leak is and that's the point. Link to comment Share on other sites More sharing options...
awfulwaffle Posted April 28, 2017 Share Posted April 28, 2017 Yep! Replaced the two lines that were letting out smoke, and now holds boost just fine. Getting this thing back to normal one zip tie at a time. Link to comment Share on other sites More sharing options...
OrsiMotors Posted June 26, 2017 Share Posted June 26, 2017 (edited) gracias, por el aporte, tengo problemas con mi subby 05 gt, cuando el turbo infla se esucha una fuga ya busque por todos lados y lleve a revisar el intercooler pero solo se redujo el sonido, de que manera puedo corroborar una fuga de boost Edit: Google Translation = Thanks, for the contribution, I have problems with my subby 05 gt, when the turbo inflates is exhausted a leak and look everywhere and take to check the intercooler but only the sound is reduced, how can I corroborate a boost leak Edited July 3, 2017 by SBT Translation Link to comment Share on other sites More sharing options...
Thelastone15 Posted April 8, 2018 Share Posted April 8, 2018 Thank you for the post. I have a 05 Legacy GT that has a leak somewhere that I cannot find. I got a code P01701 that is tell me I have a leak . I change the PCV valve clean the mass airflow sensor and still I have the check engine light on with the cruise control flashing. I will look over the engine again to see if any of these hoses Damaged. Link to comment Share on other sites More sharing options...
B1G_xyz Posted April 16, 2018 Share Posted April 16, 2018 Anyone know where to get the plastic hose that tends to leak? Im having a screeching sound under boost and I see an oily substance on that area ( the tube circled in yellow) Sent from my SM-G965U using Tapatalk Link to comment Share on other sites More sharing options...
StkmltS Posted April 16, 2018 Share Posted April 16, 2018 Isn't that the brake booster hose? Just a normal vacuum hose cut to the correct length should work. My DiySB rebuild Got Misfires? Link to comment Share on other sites More sharing options...
Flinkly Posted April 16, 2018 Share Posted April 16, 2018 (edited) it's got a 90 bend in it right where it hooks to the manifold. but could take it out under the TMIC (if you used a straight hose). i'd almost suspect that the BPV to BPV-inlet hose (or some other seal) is blowing oil onto that tube though. Edited April 16, 2018 by Flinkly * Build Thread * 26.53 MPG - 12 month Average * Link to comment Share on other sites More sharing options...
B1G_xyz Posted April 16, 2018 Share Posted April 16, 2018 This is the one I meant for clarification Sent from my SM-G965U using Tapatalk Link to comment Share on other sites More sharing options...
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