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Guest Message by DevFuse
 

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Intermittent rough idle


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5 replies to this topic

#1 provin1327

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Posted 27 December 2013 - 07:07 PM

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.



#2 nipper

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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.



#3 provin1327

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Posted 28 December 2013 - 12:13 AM

Looks like the previous owner just did a tune up, wires look new. I'll pull a plug tomorrow to see. It has 185,000 miles, didn't check the pcv vavle

#4 nipper

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Posted 28 December 2013 - 01:14 AM

On subaru engines it is amazing what the PCV valve can do when it is clogged.



#5 provin1327

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Posted 28 December 2013 - 08:40 AM

Idle was smoother this morning so maybe the seafoam helped, it still feels a little rough but not as sporatic. Didn't realize the pcv was only 6$ lol, ill change it and report back

#6 provin1327

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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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