Wide260z Posted April 2, 2006 Share Posted April 2, 2006 Alright, so some of these sensors on the 280zx EFI harness are confusing, do i need them, or what do they do? Cylinder head temp sensor - is it needed? EFI relay - what exactly does it do?? Thermal transmitter - Sounds like a detonation switch for a bomb. Air regulator sensor - Have not found this Pump control modulator - which pump is this for? Old Smog pump, or fuel pump? Should i just not worry about it? I am trying to get the EFI harness together and get everything that is needed to put it in my 74 260. Quote Link to comment Share on other sites More sharing options...
tec280zx Posted April 2, 2006 Share Posted April 2, 2006 You need at least the chts and the efi relay. won't run without them. The fuel pump modulator isn't needed either, i'm not running one. The other two aren't really needed especially being if Florida. Mainly for cold start up I believe. Quote Link to comment Share on other sites More sharing options...
Wide260z Posted April 2, 2006 Author Share Posted April 2, 2006 Well, i am planning on running the e-88 head which does not have the chts on it, am i going to have to get an ohms reading and try and by pass it or has anyone had it fixed to their older n/a head? Quote Link to comment Share on other sites More sharing options...
tec280zx Posted April 3, 2006 Share Posted April 3, 2006 You'll have to extend the chts wiring and put it into the thermostat housing water temp sensor. The two sensors are different, ones for water and the other is dry, but the resistance values are the same. Quote Link to comment Share on other sites More sharing options...
Wide260z Posted April 4, 2006 Author Share Posted April 4, 2006 Nice, so that will allow the car to run. Only other question is, will that effect the way it runs? Quote Link to comment Share on other sites More sharing options...
tec280zx Posted April 4, 2006 Share Posted April 4, 2006 Nope, should be fine. Ran mine like that for 2 years when I switched from a p79 to N47 head. Quote Link to comment Share on other sites More sharing options...
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