Question about 2001 Subaru Legacy

1 Answer

2001 Subaru legacy idle problem

The car drives normally and idles normally, then intermitantly I go to start the car, and it starts but will not idle. I have had the oxygen sensor replaced, and also the mapping sensor replaced, and it still happens intermitantly. To get it going I need to let it cool down, and then rev the engine hard and it starts to run normally again. My mechanic says it is not showing any fault codes,
and is not sure what is causing he problem.

Posted by on

  • richwen Jan 21, 2009

    Thanks, I have cleaned the idle speed controler, andthe top of the motor with Subaru brand "top end cleaner".

    The car seems to be running a lot better for now.


1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Check the IACV (idle air conrol valve) which monitors idle speed. a clean out of one is a good idea periodically either way.

Posted on Jan 19, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My 2006 subaru legacy idle goes up and down

-Check speedometer cable. It could be bad (Won out, loose connector)


Mar 21, 2013 | 2006 Subaru Legacy

1 Answer

High Idle only on cold start up and Heater is on.

To find out information on engines idling high or low visit

Jan 09, 2013 | 1996 Subaru Legacy

1 Answer

1991 Subaru Legacy 2.2L not Turbo "Idle" very

i would check the idle air control solenoid first. simply unplug it then remove the unit and inspect the air passage for any blockage and carbon buildup. Clean it if its dirty then test it out. If the IAC is good then you should look at the throttle position sensor.

Aug 30, 2011 | 1991 Subaru Legacy

1 Answer

My 1989 subaru legacy will run for 5-10mins and then starts running rough and will cut out what could this be i have replaced the the crank angle sensor Thanks finn

I would look into either the EGR system, or the idle air control valve. It is usually a clue at which point a car begins to act up, since after about ten minutes the car is usually warmed up, it would lead me to look towards the hot idle circuit of the idle air control valve. I hope this info helps.

Jul 27, 2011 | 1992 Subaru Legacy

1 Answer

Sometimes my 95 subaru legacy won't start. It sounds right just doesn't start when it finally starts if you hit the gas it dies no noises just dead.I replaced the fuel pump,o2 censor,not the problem...

I would check air flow sensor(MAF).
Just had Subaru with the same problem , at times it was hard to start , and when it finaly starts no power, rough idle , no acceleration.
I belive your car is OBD I , so you can try to disconnect air mass sensor while it's running , and see if it's any better.

Jun 08, 2010 | 1995 Subaru Legacy

2 Answers

Fluctuating hot water gauge for Subaru Baja

check your coolant level, its may be low causing the fluctuatiion also the loss of heat. if its ok replace your thermostat its not regulating tempature right

Feb 27, 2010 | 2001 Subaru Forester

1 Answer

How do you adjust idle on a 1993 legacy sedan?

idle speed is not adjustable,if your having a idling problem start by cleaning the throttle plates and the idle air control valve

Jun 28, 2009 | 1993 Subaru Legacy

1 Answer

97 Subaru Legacy GT Alternator Voltage Output

Battery is probably on it last legs... alternator sounds normal.

Dec 26, 2008 | 1997 Subaru Outback

1 Answer

Subaru Engine Vibration

I'd suspect a vacuum leak in the inlet manifold, check to see if any vacuum lines might have fallen off. This can cause a lean misfire at idle, but often it's not enough of a leak to make it lean enough to misfire at higher rpm. If a leak is not obvious, check if it is a leak by buying a can of engine start (or even CRC will do) and spray it all around the inlet manifold. If the idle smooths out while you're spraying then then goes rough again, it is a leak. By spraying in specific areas you can narrow down the area of the manifold or gasket that is leaking.

Hope this helps.

Oct 26, 2008 | 1997 Subaru Legacy

Not finding what you are looking for?
2001 Subaru Legacy Logo

733 people viewed this question

Ask a Question

Usually answered in minutes!

Top Subaru Experts


Level 3 Expert

70346 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22041 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6869 Answers

Are you a Subaru Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides