Question about 2005 Subaru Forester
Use to be low idle, but when put in neutral for a minute, it would be fine. now just rough idle and drives crappy
Spark Plugs --change every 3 years?
Front O2 Sensors-replaced at 100,000 miles?
Egr System works as it should?
No cylinder misfires?
No Vacuum Leaks anywhere?
No stored codes?
Shall I keep going?
You have to work on all vehicles at least twice a year
& look for problems
Alternator has no ac leakiage
Fuel filter new
Fuel pressure good
Throttle Plate doesn't stick?
Posted on Nov 29, 2012
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Posted on Jan 02, 2017
You did not mention model or miles. Off hand sounds like fluid. Check level and condition of fluid. If many miles maybe needing to change filter and drain and replace fluid. Hope this helps, good luck and have a good day.
Posted on May 11, 2009
I had a similar problem on my 2002 Impreza RS 2.5 (same engine and engine control system). In my case it was the O2 sensor on the intake manifold. This happened at 34,xxx mi. so it was covered by the warranty. Replacing the part is very easy. (two bolts and a wiring harness). Obviously I would start simple and cheap and work your way to expensive and difficult.
From my understanding its all caused from the engine missfiring. If its been a while or never, I'd change the spark plugs first. (stick with the Subaru Parts plugs, I went after market and the dealer claimed the plugs were not the correct "temperature" and had to pay for the new plugs and install although they did it without my permition. Thats a whole nother story).
Could also be the manifold pressure sensor.
Either 02 or manifold pressure sensor may cause intermitent check engine light.
Where I live Brookline,MA , Autozone will run a free diagnostic on your car by hooking up to your ECU and will give you the trouble codes and possible remidies. Of course there are no guarentee's but it will point you in the right direction.
Posted on Jun 18, 2009
Check the cap and rotor for internal carbon tracking or, just change them. Also, take a look at the coil when its dark and rainy and see if there is any arcing where the coil wire goes into it.
Posted on Jun 19, 2009
Drop in to an Autozone, or Pep Boys, or similar big parts store & they will usually scan for codes free. This will hopefully eliminate all the guess work, or at least point everyone in right direction for better diagnosis. If not obvious from codes what the problem is, get back to us and we'll help you out.
Posted on Aug 23, 2009
Testimonial: "Thanks for the great suggestion . I'll have Autozone read the codes on Monday. Thanks again!"
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