my 87 na runs rich im pretty sure and slightly misfires but not all the time.

  • 84z31t
    84z31t
    Member
    • 41
    #1

    my 87 na runs rich im pretty sure and slightly misfires but not all the time.

    Hey guys. Question for ya'll. My 87 Na runs pretty rich I think and it mis fires but only sometimes and its not a heavy miss either. Sometimes I het great gas mileage and sometimes I can see the needle drop when I'm just idling. Any ideas.
    1985 Z31 2+2
    1984 Z31 turbo R.I.P.
    1987 Z31 NA/turbo swap
    1986 Z31 turbo R.I.P.
    1988 Shiro Special R.I.P.
  • Augustus Maximus
    Augustus Maximus
    Senior Member
    • 1739
    #2
    Replace your 02 sensor.
    Cha iro

    enjoy building it yourself.
    if it fails, fuck it.
    at least you gave it a whirl.
  • michaelp
    michaelp
    Senior Member
    • 9384
    #3
    Could be O2 or CHTS. I generally just unplug the O2 sensors and forget they exist on Z31s. You could unplug it and see if it runs fine, that would confirm if its the issue or not.
    - VG30DET (HE341) 86 300ZX - 1982 280ZX Turbo - Headered NA 1986 300ZX 2+2 - 2000 Xterra -