Question about 2003 Subaru Legacy

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Low idles When first starting my car, it will turn over and then shut right back off. So when I start my car, I have to accelerate for about a minute to keep to stay on.. will idle at about 500 rpms until I'm ready to go, usually drives normal until I come to a stop. It will drop below 100 rpms so I put it in neutral and give a bit of gas to help keep it on. I've seen some videos that say it could be a cam shaft or crank shaft position sensor or maybe a mass air flow sensor...not sure but when I take it in to get checked, the problem doesn't duplicate untilblater in the day. But then other days it runs perfect. Help please.

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  • Subaru Master
  • 76,164 Answers

Don't quess do the testing and proper diagnostics.

Posted on Apr 26, 2013

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 2001 Subaru legacy idle problem

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

planet-x
  • 232 Answers

SOURCE: subaru impreza rs 2.5 insanely high idle

check you dont have a split in the corrugated pipe from the maf to the swirl chamber (the big black plastic tank attached to the inlet manifold) or a leak into the intake somewhere, doesnt have to be a small vac tube.

Also you may have a sticking TB butterfly as my learned friend suggested.

Posted on Dec 02, 2009

Rebgagnon
  • 382 Answers

SOURCE: I have a 1997 Subaru Legacy that wouldn't the

Sounds like the coil is going. The crank sensor will fire the ignitor and fires 2 plugs at once. Have the coil checked first. Good luck.

Posted on Jan 06, 2010

  • 102 Answers

SOURCE: my subaru was running fine and later on the

Try changing the ignition coil.
The easy way to test this, is turn the ignition on,for about thirty second's ,then feel the coil ,if it is hot ,replace it.

Posted on Mar 08, 2010

  • 125 Answers

SOURCE: MY 97 subaru impreza 2.2

Take car to garage and check engine fault codes. The problems you are experiencing suggest that it may be a faulty oxygen sensor.

Posted on Jan 24, 2011

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