Mr.RMFC Posted October 3, 2018 Share Posted October 3, 2018 Ok, so ive read a bunch of the different misfire threads but could not find one that matched with what im seeing. So I am getting a cylinder 3 misfire (I have an accesport to read the code) with the rough idle. This only happens when at idle or low speed as I can clear the code and drive on the highway if needed. It does have the flashing cruise light so I drive it as little as possible as I have a diagnosis scheduled at a shop. What I have done so far. 1. Replaced coil pack 2. Swapped injectors with cylinder 1 3. Cleaned the spark plug when it was out (Did not seem fouled) 4. Ran Seafoam through the fuel 5. Ran Octane Booster through the system What I found interesting was that, when I ran the seafoam through the system, it seemed to help for about 2 hours of normal driving as it made the idle a lot smoother and super small misfires a lot farther apart. after that 2 hours, it returned to normal roughness and threw the code. A similar thing happened with the Octane Booster but it went smoother than the seafoam but for a shorter amount of time. I have also run fuel from different stations to experiment with that with basically no difference. I have it scheduled at the local dealership as no one local can do a full diagnosis (nearest "Subaru" performance shop is 176 miles away) Figured I would post on here to see what people are thinking side note: The SeaFoam really reduced the valve noise which was nice Link to comment Share on other sites More sharing options...
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