Question about 2005 Subaru Forester

1 Answer

Subaru forester 2005 has rough idle...

Use to be low idle, but when put in neutral for a minute, it would be fine. now just rough idle and drives crappy

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1 Answer

Spark Plugs --change every 3 years?
Front O2 Sensors-replaced at 100,000 miles?
MAF Sensor-cleaned?
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
Air filter?
Throttle Plate doesn't stick?

Posted on Nov 29, 2012

  • 3 more comments 
  • Michele Spector Nov 29, 2012

    new plugs, I am buying Sea Foam to see if that fixes it and just fill up gas tank. No codes as of yet.

  • Anonymous Nov 29, 2012

    Sea Foam Does that seem like a fix That is as useless as fuel tank additives What about a real repair shop,road test & some serious diagnostic work to resolve once & be done?

  • Michele Spector Nov 29, 2012

    I am going for the cheapest fix first, then if that does nothing, hope for check engine light and some codes. I am not working right now, so cheapest first, then repair shop.

  • Anonymous Nov 29, 2012

    The car is fairly new & there is now cheap fix. I guess you did not need quality help solutions Use common sense & hope you get a job soon

  • Michele Spector Nov 30, 2012

    My car has 110,000 miles. THank you very much for your help. I am writing all your advice down. I put in stuff to clean fuel system and filled up tank. I believe trouble started after the Sandy storm and I had to get gas in another gas station in another town. Maybe a little bit ot moisture got in. So when it got really cold the other night is when the rough idle started.

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Posted on Jan 02, 2017

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Rebgagnon
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SOURCE: Transmission hesitates when put into drive 2000 subaru Forester

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

xalint1
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SOURCE: Check Engine Light

Hello engelhard58
I have attached a link that can give you some of the reasons why your getting that code.I hope you able to get your answer out of that.
Mean of the code=P0420 Catalyst System Efficiency Below Threshold.
Link to site

Posted on Dec 12, 2008

  • 22 Answers

SOURCE: 2001 Forester, Rough idle and engine loping driving at low rpm

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.
Good Luck

Posted on Jun 18, 2009

  • 6982 Answers

SOURCE: 1998 subaru forester runs rough when it rains.

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

motor1258
  • 6674 Answers

SOURCE: 2004 subaru forester, 99,000 miles. Check engine

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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Charlie

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1 Answer

2001 Forester, Rough idle and engine loping driving at low rpm


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.
Good Luck

Jun 15, 2009 | 2001 Subaru Forester

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