Question about 1990 Nissan 300ZX
Trying to get a O2 sensor connector unplugged. Japan's connectors are a *****... over engineered for special services that are unnecessary. Any suggestions welcome. The harness is hard to get to. I pulled off the wiring bracket to make it some what easier. I know they have plug-less but many after market sensors don't have the same color wires. You don't want to splice in the wrong wire to a terminal.
The O2 sensor connectors are a straight-in push and snap-lock design. Are you sure you've got the right connector? On the passenger side, look along the main intake manifold collector, just below it, halfway back, and you'll see two connectors on a bracket. You can also see the O2 sensor down in the exhaust header, so you can follow the wire up to see which connector is the correct one. Best way to separate them is what you're doing - slide the connector off the mounting bracket and then undo it - it just takes some swearing at it and the use of a small flat-blade screwdriver to separate the clip.
The driver's side connector is at the top of the engine, at the back, mounted with an identical connector next to it. Same deal there - remove from the bracket (just slide it sideways), swear at it while prying, and it'll disconnect. Because of the heat in the Z's engine bay, sometimes those connectors will stick, but there are no real tricks to it - they unclip and separate. Yours are sticking due to heat exposure. Just keep at it and you'll get them.
Posted on Aug 24, 2008
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Posted on Jan 02, 2017
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Removal & Installation
WARNING When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
NOTE Allow the O2 Sensor to cool down before conducting the test. The O2 Sensor voltage should stabilize at 5.0 volts. Raising the hood may help in reducing under hood temps quicker.
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