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  1. Y8 won't run with y8 ecu

    Engine Building
    I have a weird question. I just recently swapped a y8 head off my y5 engine and the engine will not run with it. A little synopsis of my car. When I bought my civic ex it had a y5 and had a y7 ecu in it. The car would run like shit and not rev past 5k. I swapped the heads (y8 with y8 ecu) but it...
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