1/2 boost
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This is a discussion on 1/2 boost within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; stock 02 wrx iam only getting 1/2 the boost .o5 on the stock gauge will not go any higher. no ...

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    1/2 boost

    stock 02 wrx iam only getting 1/2 the boost .o5 on the stock gauge will not go any higher. no cel i am going to check to see if ther are any codes, any help would be great

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    Registered User chappell943's Avatar
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    Has it always been like this or has this problem just started occurring? If it has always been like this then my bet is you are missing a little restrictor pill in your set up.

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    Admiral Ackbar mycologist's Avatar
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    It is very likely your boost control solenoid isn't opening as you are running on wastegate spring pressure only.
    "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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    is there any he way to test the solenoid or just replace it. thanks for the help

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    had the problem for a few weeks . thanks for the help.

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    Admiral Ackbar mycologist's Avatar
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    Quote Originally Posted by btsplat View Post
    had the problem for a few weeks . thanks for the help.
    You can run it from a 12v battery and see if it clicks. You can also clean it.

    How to test boost control solenoid - NASIOC
    "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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    now for the really stupid question. where is the solenoid?????

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    Admiral Ackbar mycologist's Avatar
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    Quote Originally Posted by btsplat View Post
    now for the really stupid question. where is the solenoid?????
    It is under the top secret black cover near the strut tower on the turbo side - there are two little latches you turn on top then look under there.
    "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 for the help i will check it out and get back to you

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    Out of curiosity, can this cause a misfire!?

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    No.
    "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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    checked solenoid with 12v and cleaned no change any other ideas,thanke for the help

  14. #13
    Admiral Ackbar mycologist's Avatar
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    Do you know anyone with a known good BCS you can swap in?

    What is going on with the misfire? Do you have Cels? Can you check you DAM?

    Did you replace any vacuum lines (i.e. the restrictor pill, T fitting, etc.)?

    Is your wastegate actuator spring feeling perky?
    "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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    should you be able to move the wastgate actuator arm. I checked for vacuum leaks could not find any.
    The misfire question is from someone else. thanks again

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    Admiral Ackbar mycologist's Avatar
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    Yeah, it has like an 8 psi spring, which is why I think I still think it is your BCS. Think about it like this, if it couldn't move, it wouldn't open and you would have run-away boost. Given a line straight from the compressor to the WG actuator you would have 8 psi (~1/2 boost) because of the spring holding it closed until the pressure in the line was sufficient. You can test that. If you have much less, the WGA spring is too weak, WGA arm not connected properly, or a mechanical issue. Any of the above would contribute to low boost with a good BCS. Leaks would actually increase your boost - that is what your BCS does - it leaks pressure from the line so the WG stays closed longer/more. The restrictor pill also reduces the flow so that the BCS can efficiently leak pressure and as calibrated by the ECU. Your ECU is a factor as it can decide your car is running so crappy that it should pull all boost control, leaving you at WG spring pressure again. That is why CEL or DAM is questioned. Tubing ID and the T must also be correct. These are really the only options other than mech.

    Otherwise you are looking at an exhaust restriction, maybe bad UP cat, bad turbo, bad compression, etc.

    "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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