2004 wrx shaking low power and a tapping noise need opinions
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This is a discussion on 2004 wrx shaking low power and a tapping noise need opinions within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Ok so I traded my 1990 eclipse gsx for this 2004 subie knowing it had an issues. The issue it ...

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    2004 wrx shaking low power and a tapping noise need opinions

    Ok so I traded my 1990 eclipse gsx for this 2004 subie knowing it had an issues. The issue it has is low power especially for a cobb stage 2 tune with full 3 in exhaust. it also shakes really bad at idle like my old cammed big block car along with a tapping noise. my friend thinks that it has spun a rod bearing I think that the rings in one of the cylinders are toast. It honestly feels like it is missing on one cylinder. the only check engine light I am getting is for the front o2 sensor fault. What is the general consensus on an issue like this? the po said he thought it just popped a head gasket but that doesnt seem right at all for these issues. Also I haven't seen any smoke come out of the car no oil loss or milkshake and it doesn't overheat. If there is another thread here with answers please link me there I searched and didn't find any definitive answers

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    OMG WTF MainFrame's Avatar
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    Probably a spun rod bearing.. I would drain the oil and look for chunks first, then if it's clean, do a compression test.

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    Admiral Ackbar the 1st mycologist's Avatar
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    Fix the cheapest thing first. The front O2 is important and could be causing a rough idle. You might not be used to how a normal Subaru sounds at idle, and especially at a rough idle.

    For the front o2, you can find the exact sensor but not labeled "Subaru". It is a lot cheaper. A universal one or anything but that exact one will not work.

    http://www.amazon.com/Denso-234-9011.../dp/B000C5YD1A

    If it spun a rod I think it would have a life span remaining of minutes, and it sort of sounds like you are past that.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

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    Thanks guys I will definitely be replacing the front o2 sensor first and if that doesn't fix anything then I guess I will be pulling the motor and building a ej22/ej205 hybrid till I can go big on the ej205

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    problem solved installed the front 02 sensor then more codes showed up leading to a bad coil pack its been replaced and had a full tune up now she runs beautifully.... now onto breaks and suspension fixes thanks for all the help

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    Admiral Ackbar the 1st mycologist's Avatar
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    Yeehaa. Nice when you don't need a new motor.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

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    ya now to just start the build on it hopefully lol need to sell the last of my dsm parts and i can start on this

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