ashwinearl Posted July 6, 2020 Share Posted July 6, 2020 I got a P0442 evaporative Emission Control System leak detected (small leak). From researching these are the things that have come up: -Gas cap loose -Bad Gas cap -Vapor canister Purge valve -leak in fuel hose / fuel tank I saw one post refer to waste gate not opening enough. Any tips on diagnosing? I am taking to mechanic on Thursday but just trying to do what I can at home. thanks Link to comment Share on other sites More sharing options...
awfulwaffle Posted July 6, 2020 Share Posted July 6, 2020 I gave up and disabled the code Link to comment Share on other sites More sharing options...
08SpecB_DE Posted July 7, 2020 Share Posted July 7, 2020 You need a smoke machine for proper diagnosing. Pull the hose off the purge that runs to the tank, this will be where you hook up the smoke. Pull the vent hose off the canister and plug the canister. Turn on the smoke and check for leaks. Dont forget to pull the access covers off under the seat. Given the age, it could be a number of things. Let us know what they find before you move forward with repairs unless it's a cheap fix. Link to comment Share on other sites More sharing options...
ashwinearl Posted July 10, 2020 Author Share Posted July 10, 2020 (edited) They found a leak at a plastic T behind the alternator. I have also had some rough idle issues after start up and clutching in. So not sure which this leak impacts. In the attached diagram, I believe the purge valve is part 42084G. The black T in question is part H505081. It looked like he identified the leak by spraying soapy water on the area and it bubbled. They replaced the T with a bigger one. I had replaced the Blue T of death behind the manifold, but really never acknowledged this other T off the Purge valve. I had reset the ECU and cleared the code on Monday and had 100miles on it when I had brought it in for the inspection. Edited July 11, 2020 by ashwinearl Link to comment Share on other sites More sharing options...
Max Capacity Posted July 11, 2020 Share Posted July 11, 2020 For reference in the future, you can buy metal T's to replace the plastic ones. https://www.google.com/search?q=brass+t+fitting&rlz=1C1OKWM_enUS906US906&oq=Brass+T+fitting&aqs=chrome.0.0l8.10663j0j8&sourceid=chrome&ie=UTF-8 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
ashwinearl Posted July 11, 2020 Author Share Posted July 11, 2020 For reference in the future, you can buy metal T's to replace the plastic ones. https://www.google.com/search?q=brass+t+fitting&rlz=1C1OKWM_enUS906US906&oq=Brass+T+fitting&aqs=chrome.0.0l8.10663j0j8&sourceid=chrome&ie=UTF-8 I had replaced the blue T of death with TurkeyLord's metal T a few years ago. The mechanic did this one for me. The car is driving great now. I can feel improved responsiveness. I don't know much about the EVAP system. Is it typical that fixing a leak here would impact overall driveability? Link to comment Share on other sites More sharing options...
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