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This is a discussion on 2002 WRX "Lack of acceleration" Please give input. within the Car Purchasing Forum forums, part of the ClubWRX.net Marketplace category; Buy it for 3k or as low as he will go, rip out block and rebuild it. Problem solved. I'd ...

  1. #16
    Registered User lytlec's Avatar
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    Buy it for 3k or as low as he will go, rip out block and rebuild it. Problem solved. I'd probably buy it if the rest of it was in good shape.
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    Registered User lytlec's Avatar
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    Quote Originally Posted by mybwhtwrx View Post

    To answer the diagnostic question. If you take a lab scope, and you hook it to the starter cable. You remove the relay for the fuel pump so the vehicle will not start (and you wont be flooding the engine by disabling spark) then as you turn the car over you can watch/measure the sine wave of starter draw. All of the cylinders should have similar wave forms. It is a quick way to tell which cylinder, if any, may have a health concern (based on the firing order, compared to the scope results) Pretty cool really.



    Let me know what you guys think.
    Umm or you could do a compression test...
    <-------- Taylor Swift.
    2006 WRX 330whp. 300wtq. Slow.
    Hawk-Eye Alliance #137
    First Mods...what to do.
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    Isn't it a difficult time getting spark plugs out/compression testing the H-4s?

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    Registered User lytlec's Avatar
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    Quote Originally Posted by mybwhtwrx View Post
    Isn't it a difficult time getting spark plugs out/compression testing the H-4s?
    No. Nothing is difficult with the proper socket wrench and flexible joints. I'm not saying your way doesn't work but I've never heard of anyone doing it that way ever....
    <-------- Taylor Swift.
    2006 WRX 330whp. 300wtq. Slow.
    Hawk-Eye Alliance #137
    First Mods...what to do.
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  6. #20
    zax
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    Actually that's quite clever... Something I've never considered before. Still, since the starter is spinning the crank at about 500 rpm, it's not a complete indication of static compression. Would you be able to discern a cylinder with 150 psi of compression from a cylinder with 30 psi of pressure? Likely. +/-15% likely not... Long story summarized: I'd still perform a static compression test.
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    Quote Originally Posted by zax View Post
    Actually that's quite clever... Something I've never considered before. Still, since the starter is spinning the crank at about 500 rpm, it's not a complete indication of static compression. Would you be able to discern a cylinder with 150 psi of compression from a cylinder with 30 psi of pressure? Likely. +/-15% likely not... Long story summarized: I'd still perform a static compression test.
    No I agree completely. I will take a standard compression tester with me. The kid is going to **** bricks, im going to show up with $8,000 worth of diagnostic tools to see if his vehicle is trade worthy. Hopefully these pictures will up load as well - Click image for larger version. 

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