ZachCouch Posted June 11, 2018 Share Posted June 11, 2018 Since I bought my car (2005 Outback XT), I've noticed this inconsistent "hiccup" in the idle, and I can't find a definitive answer as to what it might be. It only shows up when the engine is warm and at a resting idle below 800-ish rpm. It's worse if the weather is hot, and doesn't really show up at all if it's cold out. Never happens when revving, accelerating, or cruising. You can't really hear it in the exhaust, but if you hold your hand in the exhaust stream you can feel it, and you can barely feel it sitting inside the car. I tried, but it doesn't show up well on recording. The best way to describe it would be to imagine the usual low rpm boxer vibration and rumble, with a slight jerk or hiccup every few seconds. (rrrrrrrrrrrputrrrrrrrrrrrputrrrrputputrrrrrrrrrrrrrrrrrput) After buying the car I ran injector cleaner, cleaned the MAF sensor, replaced the filter, replaced all four plugs, replaced both O2 sensors (trying to get rid of a P0420), and replaced both camshaft sensors when one died a couple months ago. Nothing has had any effect on the hiccup. It doesn't bother me, but if it's something detrimental I'd like to fix it. I'm not getting any misfire codes, but I'm thinking possibly a squirrely injector or coil. Link to comment Share on other sites More sharing options...
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