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Clunking noise when accelerating ’04 Subaru Legacy

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  • #860488
    George ColgroveGeorge Colgrove
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      The head gasket in my Subaru has to be replaced which is $1800 and I have invested about $2000 already in this car over the past year but I also have this clunking which makes me think I should invest in another car. It has 186,000 miles. It makes the clunking noise when the car accelerates and the rpm gets to 4,000. However when the car is parked I can rev it to above 5k and it doesn’t happen. The noise is noisier when I go around a corner while accelerating at a lower rpm. Also it happens at a lower rpm when I go up hills. However if I keep my rpm below 3,500 it is a noise free drive which is 98% of the time. Anyone have any thoughts what is wrong and how much it would cost? I love this car, but as a college student I can’t afford doing the $1800 head gasket and finding out there is a large issue. Any advice? Thanks. 🙂

      The clunking seems to originate around the center console (I can’t check outside of the car since it happens when the car is moving. When it starts happening I have to gently take my foot off the gas so my rpm drop and it goes away and then the noise goes away. Looks like nothing is loose, it sounds like something knocking inside of a box sort of?

      Car
      2004 Subaru Legacy 35th edition L wagon
      H4 engine
      AWD (disabled cause previous owner towed it)
      4 speed auto

      Previous repairs:
      Cats (last year)
      Valve covers gaskets (last year)
      Spark Plugs and wires (last year) [one spark plug had a damaged electrode]
      Brake Pads and rotors(6 months ago)
      Oil changes (mix for 4,000 then now full synthetic for the past 1,500)
      Front structs (this year)
      Fixed a leak in the moonroof (6 months ago)

      When I first got the Subaru, you could floor the gas and slow down going up a hill, the acceleration was awful, after the repairs it can accelerate up a hill and get from 0-60 quite quickly (but I don’t since this clunking sound)

    Viewing 16 replies (of 16 total)
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    • #885855
      JudyJudy
      Participant

        Been there, done that. Replaced both CV joints TWICE to no avail. The clunking noise continues. Took it to my mechanic AND Subaru dealer. Everyone is scratching their heads. They suggested to just start replacing parts!

      Viewing 16 replies (of 16 total)
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