Question about Cars & Trucks

1 Answer

2000 Subaru Outback Not Starting in Cold Weather (below 35 F).

I own a 2000 Subaru Outback 2.5L and it has 174K miles on it. I have owned it for three years now and it has always had issues with starting in the cold (temperatures under 35 F). I am located in the Pacific Northwest and live in Vancouver, Washington, which does well to keep slightly above this degree, but the weather still dips below causing my frustration. When turning the engine over, the starter will continue without turning the engine over 90% of the time. In the few times it does turn over, the engine runs extremely rough and will die. Attempting to turn the engine over again will end with the same result leaving my family and I stranded. I have replaced quite a few parts including: fuel filter, fuel pump, battery, each part included in a tune-up multiple times, and I keep up with the oil changes. I had the injectors flushed out at a local shop, which increased my acceleration when the car is running, and they told me a pressure relief valve (name may be incorrect but the action is important) on the fuel pump needs to be replaced. The valve is not leaking fuel but allows air into the line making the fuel drain back into the fuel tank causing longer turn-over times since the pump has to fill the line again to reach the injectors. My question is to individuals who are mechanics and who may have dealt with this same or similar issue, does this sound like a reasonable fix to the problem? I have been dickering with this issue for far too long, though I have been putting it on the back burner at times, and I would like some outside opinions. Any help is appreciated, and thank you in advance.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Cars & Trucks Master
  • 47,745 Answers

Simply put the vehicle has a fault recorder and storage facility that when a scan tool is used will reveal the faulty sensor and nowhere in your statement did you mention that the fault codes were read
next hard starting in cold weather indicates that the ECM is nit receiving the temperature reports or the air density reports that it needs to know how rich to make the fuel mixture ( like pulling on the old choke cable but electronically done )
If the codes are read you will most likely find ambient air temp sensor faults , barometric pressure sensor , maf/VaF sensor problems

Posted on Feb 28, 2017


5 Suggested Answers

  • 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 Mechanic 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 repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 508 Answers

SOURCE: The 2000 mountianeer starts and runs fine but shuts off


Posted on Jan 24, 2009

  • 3 Answers

SOURCE: Engine will not idle and run when starting in cold weather

Have a mechanic take a look at your throttle position sensor and engine idle sensor. Make him manually adjust them as opposed to just putting in new ones. It may require that you have to have a higher idle than normal. Your underlying cause is going to be that I am sure you have a lot of miles on your engine.

Posted on Jul 20, 2009

  • 1 Answer

SOURCE: 3.8CI, V6 Engine will not start in cold weather.

I'm having a similar problem. The mechanic replaced the fuel pump relay and car ran fine for a while. The problem has since reoccurred. What I've read is that this could be caused by loose wiring connections or a bad ECM (computer) which is a notorious problem for this engine. I first thought it was a fuel delivery problem as well but I'm thinking it is more of a wiring issue.

Posted on Mar 16, 2010

SOURCE: 2000 Subaru Outback will not Start/Run in the Cold

Lan card Intel Lakeport-G i945G / Intel 82801GB ICH7 I am not receving audio voice

Posted on Feb 07, 2014

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

2000 Subaru Outback will not Start/Run in the Cold

Lan card Intel Lakeport-G i945G / Intel 82801GB ICH7 I am not receving audio voice

Feb 07, 2014 | 2004 Subaru Outback

1 Answer

Hesitating, hard starts, consumes alot of fuel

blown head gaskets would explain all of your issues
sorry to be the bearer of bad news but 191,000 miles is a good run if you had it since new

Dec 27, 2013 | 1997 Subaru Outback

1 Answer

What type of batter does a 2000 subaru outback need?

Group number 35, 640 cold cranking Amps (800 cranking Amps)
100 reserve minutes.

Jan 09, 2011 | 2000 Subaru Outback

1 Answer

Gas smell when heat is on in very cold weather

Your mixer door on your heater isn't closing the outside air flow properly. Although, there is probably a leak test that should be done on the fuel.

Jan 15, 2010 | 2000 Subaru Outback

1 Answer

2000 Subaru Outback Wagon (100K miles) with P0420 Code

I do not know for sure if this is the problem you are having, But, I have noticed that from 95 up to 2002 I have seen a lot of PO420 codes that have been just the sensor. I do not know if it was a weak sensor or just that program telling it that it is below threshold. I did notice that if the vehicles are run for a long trip at highway speed it goes out. I wish you luck and have a great day.

Jan 12, 2010 | 2000 Subaru Outback

2 Answers

Check engine light on. P0325, P0420 2000 Subaru


Nov 13, 2009 | 2000 Subaru Outback

1 Answer

Does the 2000 subaru outback have a timing belt that needs to be changed and at what miliage intervals

It should if it is a 4 cylinder. And any good mechanic would suggest to replace the belt between 70,000 to 90,000 miles.

Oct 25, 2009 | 2000 Subaru Outback

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

52 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14398 Answers

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

Answer questions

Manuals & User Guides