subestyle18 Posted February 2, 2006 Share Posted February 2, 2006 I have a 93 legacy with the 2.2 and about a week ago the idle started surging (500-1000) and idleing really rough. It will even die sometimes when the car is just sitting. Another one of my cars had a simalar problem and it was the coolant temp sensor so i replaced that but it changed nothing. Any ideas would be great. The check engine light will go on at highway speeds but never stays on more then 30 sec's or so. I dont have a reader so i havent pulled the codes. Thanks David Quote Link to comment Share on other sites More sharing options...
sasquatch Posted February 2, 2006 Share Posted February 2, 2006 The ever popular MAF or look for vacuum line issues....lots of threads on dealing with MAF issues, use "search" Quote Link to comment Share on other sites More sharing options...
NoahDL88 Posted February 2, 2006 Share Posted February 2, 2006 Mine had issues with the IAC, get some seafoam down the vaccume line in there, and let it soak for a little while and it should get better. If its the IAC. Quote Link to comment Share on other sites More sharing options...
Legacy777 Posted February 2, 2006 Share Posted February 2, 2006 I have a 93 legacy with the 2.2 and about a week ago the idle started surging (500-1000) and idleing really rough. It will even die sometimes when the car is just sitting. Another one of my cars had a simalar problem and it was the coolant temp sensor so i replaced that but it changed nothing. Any ideas would be great. The check engine light will go on at highway speeds but never stays on more then 30 sec's or so. I dont have a reader so i havent pulled the codes.Thanks David Pull the ECU codes www.surrealmirage.com/subaru/engine.html Quote Link to comment Share on other sites More sharing options...
jib Posted February 3, 2006 Share Posted February 3, 2006 Pull the codes, but surging and hunting often means a failed O2 sensor. Jack Quote Link to comment Share on other sites More sharing options...
aa8jzdial Posted February 6, 2006 Share Posted February 6, 2006 David Had the same surging problem on daughter's 90 2.2. Swapped out the idle air control unit and all is well. Wish I had thought of the seafoam treatment though. rick w. mi. Quote Link to comment Share on other sites More sharing options...
subestyle18 Posted February 8, 2006 Author Share Posted February 8, 2006 Though i'd let ya know how it worked out. I pulled the code #32 o2 sensor. Replaced that, still a bad idle. Started hunting for vacume leaks and found that the drivers sides intake manifold gasket had blown out, making one of the cylinder miss at idle, that probaly killed the o2 sensor. Replaced the gasket and now im running great. Thanks for the help and the info on how to pull the codes. David Quote Link to comment Share on other sites More sharing options...
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