Del Val Miata Club

Serving Miata Owners in the Delaware Valley Region


  • June 16, 2019 9:04 PM
    Message # 7583015

    Bought a new 2018 MX-5 last year.  Only has 2500 miles on it and noticed black soot on exhaust tips, indicating rich mixture.  Dealer said this is normal, and so did internet bulletin boards, but I don’t believe it. 

    Has anyone else experienced this and what, if anything, have you done to fix?


  • July 01, 2019 8:31 AM
    Reply # 7719821 on 7583015
    Deleted user

    Yes, unfortunately, this is totally normal on cars with direct injection engines.  Check out this article from Car and Driver:

  • August 01, 2019 7:22 AM
    Reply # 7807203 on 7583015
    Deleted user

    As far as my experience all miatas from day one run a little rich. That's how they get the power and keep the motor safe from leaning out. Only way to fix is have someone that can recalibrate the ecu on a dyno. 

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