Houstonb2 Posted April 11, 2018 Share Posted April 11, 2018 Hello. This is my first thread so just a heads up. I have a 2005 Subaru Legacy GT. Lately my car has been acting up off and on. It recently threw misfire codes on the 3rd and 4th cylinders. The one thing I noticed is a coil pack connector is broke and I ordered a new one on eBay for like 15 bucks. I just recently changed the valve cover gasket to lesson my oil leaks so I can pinpoint anymore and broke it in the process. I did the with the engine still in the car and that is not a fun job.I have ran a few tanks with fuel injector cleaner and octane booster thinking maybe I keep getting bad gas somewhere or my injectors need a good cleaning. I also replaced the spark plugs too while I was in there with nkg plugs. My thoughts are after I replace the cool pack connector it will be fixed. If that does not work I am thinking bad coil packs because two cylinders are misfiring and I only have one broken clip. I also might check sensors but I have no codes and I thought cam, knock, and o2 sensors would tell the computer they are bad. Maybe not if they are just dirty? Any help could really be useful considering I am trying to keep this car running and cannot afford a new car at the moment. Thank you Link to comment Share on other sites More sharing options...
Houstonb2 Posted April 11, 2018 Author Share Posted April 11, 2018 The thing I am worried about the most is that the exhaust valves might need adjusting. The problems goes in and out so it gives me hope that this could be electrical or injectors. It does seem to have issues more in the cold before it warms up all the way. It seems to misfire less if I gradually come to a stop vs. slamming on my brakes. My tranny fluid is getting pretty bad and wondering if it could also be a torque converter going out. Link to comment Share on other sites More sharing options...
relative4 Posted April 11, 2018 Share Posted April 11, 2018 To diagnose a single-cylinder misfire, swap coils - for instance, swap #2 with #1. If the misfire follows the coil, replace the coil. If not, swap injectors. If the misfire stays put, time for a compression test. Link to comment Share on other sites More sharing options...
Houstonb2 Posted April 11, 2018 Author Share Posted April 11, 2018 Thank you for the advice. I will try this and see what happens. I will update after I try swapping these out. If I have two cylinders misfiring does that mean it is more likely a compression issue? Link to comment Share on other sites More sharing options...
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