1996 Impreza Outback, 2.2: 5 speed has developed an intermittent rough idle. I noticed it when I came back from a highway drive. It only happens at idle, it takes off fine and runs fine, no check engine codes either. I replaced the fuel filter, put some seafoam in the vac line as well as a gas tank because I am thinking it may be a dirty air idle controller or a dirty injector. What confuses me is that it doesn't always run rough. Sometimes it runs perfectly smooth at idle, warm or cold, then 5 minutes later it will start to run a little rough. Not a misfire but a sort of out of balance engine feeling in my seat if that makes sense.
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Intermittent rough idle
Posted 28 December 2013 - 12:10 AM
I see nothing about starting off with a tune-up. Wires, plugs, PCV valve.
How many miles?
I am going to assume no CEL, so at this age yes it can be a tired
idle air motor.
Posted 28 December 2013 - 12:13 AM
Posted 28 December 2013 - 01:14 AM
On subaru engines it is amazing what the PCV valve can do when it is clogged.
Posted 28 December 2013 - 08:40 AM
Posted 05 January 2014 - 11:36 AM
So after my last post the rough idle came back, but it looks like the PCV valve replacement has fixed it. That or it was a combo of the PCV, new fuel fitlter, and Seafoam that fixed it hah
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