Guest polarity Posted April 14, 2003 Share Posted April 14, 2003 Does anyone know if the 79 280zx's (manufacture date 8/78) came with an O2 sensor in the exhaust manifold. I have a hole for one, but doesnt seem to be any wiring for it. Billy Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted April 15, 2003 Share Posted April 15, 2003 Does it have a head temp sensor? If it does, then it should have the wiring for an O2 sensor. No head temp sensor and I would say it is the first gen EFI. You could also have the wire in the harness, just taped up. Quote Link to comment Share on other sites More sharing options...
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