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ECU diag help


Freeway
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Hi!! I've done Ecu diag on my Z24i engine. It's ok - code 55, but black smog from exhaust tell me that air/fuel mixture isn't ok ( end my Terrani eat too much fuel, sometimes idle drops too low ~ 400rpm). I know, that in normal mode ECU work in Mode I. Right, or not?? And my RED indicator is always ON. What is means?? :confused: Please help, I need for your suggestions.

 

Thanks!

 

Igor aka Freeway

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