Loss of power and very loud internal engine noise on 2004 Legacy GT sedan

Discussion in 'Subaru Impreza' started by PaulR, Dec 2, 2020.

  1. PaulR


    Dec 2, 2020
    Likes Received:
    Appleton, WI
    Hello everyone I am new to this forum. A while ago my brother experienced a problem with his 2004 Legacy GT sedan. It is factory stock with the 2.5 liter SOHC non turbo engine mated to the "SportShift" four speed automatic transmission. Tooling down the highway at about 60 mph the car suddenly lost power as it developed a relatively loud, say engine knock. He immediately turned off to a side road and shut the engine down. He tried to restart the engine minutes after that and several times later, but it would not fire. He towed it home and then when he tried to start the car again it did fire and run. The car continues to be able to start but of course still has low power and he does not want to move it any distance. The noise is a very loud ticking almost like valve clatter. The exact place that the noise is coming from is not known. Connecting rod, connecting rod bearings, transmission area, we don't know. The harmonic balancer does appear good. There is no smoke coming out from the exhaust although a very slight whitish color upon initial start up. All of this is happening without the oil light or check engine light coming on. The vehicle has 181,500 miles.

    We are going to get the problem diagnosed at a repair shop this week but I figured to run this through you folks first to maybe come up with some ideas. The better educated and informed I am before going to an auto facility is a good thing. Are there any common issues with this type of Subaru engine as described above? This year 2.5 liter (EJ25) is an interference engine, I gathered, so if this was a"major" problem the engine would not run. Maybe the cam slipped all so slightly and caused a timing issue. I don't know. Any help is appreciated and thank you in advance.

    Sorry, I put this mistakenly in the Impreza section and decided to go forward anyways as I was more than half way complete.
    Last edited: Dec 2, 2020
    PaulR, Dec 2, 2020
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