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Old 07-22-2010, 03:50 AM   #1
wrx0001
Scooby Newbie
 
Member#: 99887
Join Date: Nov 2005
Chapter/Region: MAIC
Location: Radford, VA
Vehicle:
2002 tbxs stg 3 wrx
black

Default No power at low RPMs Help Please.

I have a 97 legacy outback with a 2.5l and automatic transmission. It has 172,000 on it. it has always ran fine until a few weeks ago. When I try to accelerate from a stop or low speed the vehicle seems very sluggish. It feels almost like its bogging down, However once I get passed 3000 RPM it pulls like it always has. I have no CEL showing. Any Ideas? Could it be a bad knock sensor with out throwing a code? Thanks for any help in advance
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Old 07-22-2010, 11:04 AM   #2
yarrgh
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Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

what normal maintenance has been done recently? How's the fuel economy? I kinda doubt it would be a bad knock sensor w/o a code, but it could be a bad oxygen sensor going out w/o a code. Try an ECU reset and see if that does anything. report back.
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Old 07-22-2010, 02:01 PM   #3
kewlboxer2
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Member#: 161322
Join Date: Oct 2007
Chapter/Region: Tri-State
Location: Galeton, PA
Vehicle:
06 2.5i
Regal Blue

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air filter and cleaning maf if you havent yet
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Old 07-22-2010, 11:45 PM   #4
wrx0001
Scooby Newbie
 
Member#: 99887
Join Date: Nov 2005
Chapter/Region: MAIC
Location: Radford, VA
Vehicle:
2002 tbxs stg 3 wrx
black

Default

Thanks for the input guys. It was the knock sensor. I pulled it and could instantly see the crack. Not sure why it didn't trip the CEL though. I replaced it and its back to normal. I haven't owned the car for very long. I am planning on doing plugs, wires and air filter. Anything else I should replace while I'm at it? Timing belt has about 50,000 on it so it should still be good.
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