ebbsspeed Posted April 9, 2023 Share Posted April 9, 2023 I'm replacing the short block on a 2008 Outback XT (E255 Turbocharged engine) and am wondering what the function of this part is. It appears to be an air pump of sorts, and I assume it is part of the emissions control. Can someone confirm what it is, and whether or not it can be deleted? If deleted, will it generate codes? This is the newest, most complicated Subaru I've worked on to date, so I'm taking a lot pf pictures and laying out parts in order of removal. Thanks! Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted April 10, 2023 Share Posted April 10, 2023 air cut valve pump. It comes on for maybe 45 seconds on a stone-cold start. Some cars need to keep one ofr the valves for an air pressure sensor that's in it? Others can remove the valves and pump. Some companies made block-off plates for the valve locations. My valves rusted shut after about 4 years so, I just killed the codes but left the parts in place. I think I deleted about 14 codes on my WRX. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted April 10, 2023 Share Posted April 10, 2023 50 minutes ago, 1 Lucky Texan said: My valves rusted shut after about 4 years so, I just killed the codes but left the parts in place. I think I deleted about 14 codes on my WRX. 14 codes!!! probably improved 0-60 times not needing to process all that extra data. Lol. Quote Link to comment Share on other sites More sharing options...
azdave Posted April 10, 2023 Share Posted April 10, 2023 (edited) This may be useful reading. https://www.possumbournemotorsport.com/blog/subaru-air-pump-delete/#:~:text=A secondary air pump system,work to reduce engine emissions. Edited April 10, 2023 by azdave Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted April 11, 2023 Share Posted April 11, 2023 (edited) there's also a long thread over at NASIOC....https://forums.nasioc.com/forums/showthread.php?t=1209260 Edited April 11, 2023 by 1 Lucky Texan Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted April 11, 2023 Share Posted April 11, 2023 On 4/9/2023 at 8:22 PM, idosubaru said: 14 codes!!! probably improved 0-60 times not needing to process all that extra data. Lol. yep, 14 or 16....around there. 1 Quote Link to comment Share on other sites More sharing options...
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