TwinTurbo.NET: Nissan 300ZX forum - One other thing to check is the O2 sensors and
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Subject One other thing to check is the O2 sensors and
     
Posted by MixManMash on May 24, 2017 at 7:06 AM
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In Reply To Check that the PCV hardlines coming out of the intake valve posted by MixManMash on May 23, 2017 at 05:50 PM
     
Message condition of the wiring harness going to the O2 sensors. I had some idle weirdness going on years ago. Despite the heated O2 test passing, it appeared that the ECU was not getting a great signal. Turns out that from the O2 connectors on the EFI harness, the wires were pretty corroded about 16" up. I ended up cutting and splicing in new wires. After I did that, the weirdness went away.

     
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