BoyceWare Posted April 30, 2011 Share Posted April 30, 2011 Hello - Just picked up my first Legacy and I am having issues with a rough idle. Based off little experience I had with a newer WRX I have a feeling it has something to do with the aftermarket intake and vacuum lines leading to nowhere. I've numbered each missing line 1,2, & 3 however I could not find a vacuum line diagram that actually made sense to me . It appears that the car is idling around 500-600 RPM, if I manually up the throttle the car sounds great 1k rpm +. When I turn on the AC the idle ups to an acceptable position and does not sound like it wants to stall. I've posted some detailed pictures hoping someone could help. I'm already searching for a stock airbox setup to replace this aftermarket intake. Thanks, Dan Link to comment Share on other sites More sharing options...
nmd003 Posted May 2, 2011 Share Posted May 2, 2011 I know that 2 and 3 definitely go to the stock airbox setup. Not 100% sure about #1, but I think it might go to it to. Not currently near an engine so can't say for sure. Link to comment Share on other sites More sharing options...
Osei Posted May 3, 2011 Share Posted May 3, 2011 perhaps this will help http://opposedforces.com/parts/legacy/us_b12/type_4/carter_ventilation_recirculation/emission_control_pcv/illustration_1/ and this for future ref http://www.main.experiencetherave.com/subaru_manual_scans/2000+_Legacy_FSM/ O. Link to comment Share on other sites More sharing options...
Osei Posted May 8, 2011 Share Posted May 8, 2011 Maybe I am being over sensitive in my dotage, but a thank you would have been nice. O. Link to comment Share on other sites More sharing options...
BoyceWare Posted May 9, 2011 Author Share Posted May 9, 2011 Maybe I am being over sensitive in my dotage, but a thank you would have been nice. O. HAHA thank you for the help, and I'm not just saying this because of your message. I believe I found the cause of my rough idle and it had nothing to do with these vacuum lines. My TPS sensor was causing a CEL and going haywire (voltage up / down without moving the throttle), I believe was due to a bad ground (fixed). I also had a bad knock sensor and a broken connector in my evap solenoid. After fixing these issues my idle appears to be normal and the car is running well. Working through wheel bearings now but that's another story. Thanks again, Dan Link to comment Share on other sites More sharing options...
Osei Posted May 9, 2011 Share Posted May 9, 2011 Glad you found the problem and it has been resolved. O. Link to comment Share on other sites More sharing options...
jamal Posted May 11, 2011 Share Posted May 11, 2011 those are all part of the pcv system. normally they recirculate back into the intake and you should probably find a stock intake and hook them back up or at least run them all into a catch can. Link to comment Share on other sites More sharing options...
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