Issues getting my outback to start/idle right.

Asked by Ben Mar 01, 2020 at 02:16 AM about the 2004 Subaru Outback Base Wagon

Question type: Maintenance & Repair

I'm having issues with my car starting and when I do get it
started it has a low rough idle. I'm thinking it has something
to do with an p2 sensor or an issue with the fuel getting to
the engine. When I do get it started it has a low idle until i
warm it up. When i come to a stop the idle is also real low
to the point of it almost dying. The at temp light will
occasionally come on or flash as well. I can hear my fuel
pump turn on and I've had the ignition coil, spark plugs, and
spark plug wires changed. Its currently not starting but
turns over so it's getting power from the battery.  I'm
thinking maybe there isn't enough fuel or o2 for
combustion?  Any help would be greatly appreciated. I need
my car for work and don't have money to take it in so any
ideas on what it could be would really help.

3 Answers

80

How longs it been since uve taken sum carb cleaner and scrubbed out ur throttle body with a brush

Try a tuneup, filter change and a fuel system cleaner in addition to the first suggestion.

48,700

The newbie's right...except for spelling. Remove the intake hose and plenum from the throttle body and thoroughly clean the venturi. Hold the butterfly horizontal (wear rubber gloves!) as you squirt fluid on the top and bottom sealing surfaces while scrubbing with a small brush or strong paper towel. The car will then restart roughly and dirtily as it's choking on the cleaner (sorry, Mother Nature), but should smooth out to a nice idle, assuming your plugs, wires and coilpack are happy. If this doesn't work there's a small one-wire spark plug-looking-like sensor that bolts into the intake manifold right below where you were squirting fluid. It's a cold start sensor that tells the ECM to enrich the fuel/air for cold starts. Under $20, and easily replaced. Maybe not a bad idea to buy one and replace while you're back there with the cleaning operation so you don't have to repeat removal of the plasticware back there. Best, Ern TSG/B

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