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  • 4 wire O2 sensor conversion

    If you convert your header to an aftermarket header, there is a great chance that the O2 bung will be too far away from the exhaust ports and, therefore, runn too cool. You can get a generic 4 wire O2 sensor pretty reasonably at any auto parts store. This link will tell you all about making the conversion.

    http://mymiata.paladinmicro.com/Miata4-WireO2.htm
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    1990 with FFS Coldside. At least 260 WHP NON-INTERCOOLED

  • #2
    Wow, that's some good digging, Tom! I remember talking to Cliff Knight half a dozen years ago when I added a 4-wire to my 92 that used an inexpensive ebay header. FWIW, that O2 sensor has a connector made for a Dodge Dynasty. I don't have the p/n at work, but you can buy the corresponding male connector at a Chrysler dealer for under $20. It's nice if you want to be able to swap out the O2 sensor relatively quickly, but not necessary.
    97M - FFS Coldside 105/65, FCM 600/375, FM frame rails, big RB front sway, HDHCHTDDSS, Thermal, Wilwood BBK, RE-11As...

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    • #3
      I’d be interested in that.

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      • #4
        That's not my link. Credit goes to Byrdmen. He was kind to dig that up for us.
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        1990 with FFS Coldside. At least 260 WHP NON-INTERCOOLED

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        • #5
          Here's the part number for the Chrysler connector: 4439077.
          97M - FFS Coldside 105/65, FCM 600/375, FM frame rails, big RB front sway, HDHCHTDDSS, Thermal, Wilwood BBK, RE-11As...

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