Question about 2005 Subaru Forester 2.5

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Forester 2005 hard to start in morning

I can only start it with aero start, then once warm will start fine all day. Have changed plugs, oil and filter, crank angel sensor, air filter and fuel filter. Has also been to Subaru and they spent 6 hours on it and not fixed. Any ideas. It's do e 144 k and has excellent compression.

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  • Subaru Master
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Please have a fuel pressure leak down test performed, most likely the check valve in the fuel pump has failed. A special tool and skills are needed top run this test.

Posted on Apr 29, 2013


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Posted on Jan 02, 2017

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SOURCE: subaru 1993 legacy rough start with backfire/missfire.

O2 sensors do not cause any kind of starting problems, what can is a dirty upper intake and loss of fuel pressure after the pump turns off.
Here is what I would like you to do, run a fuel pressure leak-down test on the system, to do this you will need a fuel pressure tester, this connects to the fuel pressure test port that is in the fuel supply rail that connects to the fuel injectors, it looks like a metal tire valve, the tester is about $15 at any Kragen or store like it, hook the tester up and verify no leaks, then run the engine and make a note of the fuel pressure reading, shut it of nd let it sit, the pressure should not drop more than 5 PSI overnight, if it does the fuel pump is defective as the check valve in the pump has failed, this allows fuel to drain back to the tank and creates a lean condition when the car is 1st started, result, rough running, long cranking times..

Posted on Apr 17, 2009

  • 23 Answers

SOURCE: My 2003 subaru forester idle very rough. if you

1) Check all the vacuum hoses for a leak in the rubber hose or a hose that isn't connected. Vacuum leaks cause motors to shake and stumble on acceleration.
2) There's a plastic T connection on the back side of the engine behind and under the air cleaner box. That T connector joins together three air hoses of different sizes and is prone to breaking from heat stress. Only a Subaru dealer will have this part.
3) Even though the spark plug wires are new, you may have a bad one. Don't waste your money on cheap parts; they cost more in the long run.
Good luck!

Posted on May 07, 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

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SOURCE: 2005 subaru outback cabin air filter install

Yes the o5 outback has a cabin air filter and it is located behind the glove box. You have to remove the glove box, once you get it out of the way you will need to remove the 4 metal clips that hold it in place and make sure you put the filters in with the arrows pointing in the right direction for air flow. Other wise you will have restriction through the vents

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SOURCE: Subaru Legacy LS 4WD won't fire

timing belt broke most likley

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