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ccv leak

  1. Po174 Diagnostic help here you go

    General E46 Forum
    P0171 & P0174 Diagnostic help here you go 1. Check additive and multiplicative values 2. Perform smoke test of intake using inert smoke 3. Check Crankcase pressure with Manometer 4. Use a VE calc(volumetric efficiency calc) I posted how to do this and the file a while ago don't remember when...