Coolant temp / fuse wiring problem

[Forch77]

I pulled off the housing and replaced the sensors besides the one with the bullet connector and pulled off the vacuum valve. But now I have no place to but the water temp sensor because that hole for the vacuum valve is to big for it. Any ideas on what to or anyone that has actually done this swap post a pic of how you have the sensors arranged?

[siteunseen]

You could use a reducer like these, R & M Distribution - EEXD Brass Reducers.

They're at my Lowes building supply locally.

[Zed Head]

Can't really tell what this means - " replaced the sensors besides the one with the bullet connector" but you probably don't need the switch on the upper left, in the attached picture. Your 77 probably had a switched, two-pickup distributor, to control timing while warming up but it's not really necessary. You might remove it and see if the thread and hole size are correct.

Thought that you were getting a different housing.

[Forch77]

You could use a reducer like these, R & M Distribution - EEXD Brass Reducers.

They're at my Lowes building supply locally.

Thanks for the link with the name of it! I went down to home depot this morning described what I needed and the guy said there was no such thing. His face was priceless when he asked me what I was doing back and I showed him the "non-existing" piece.

Can't really tell what this means - " replaced the sensors besides the one with the bullet connector" but you probably don't need the switch on the upper left, in the attached picture. Your 77 probably had a switched, two-pickup distributor, to control timing while warming up but it's not really necessary. You might remove it and see if the thread and hole size are correct.

Thought that you were getting a different housing.

I tried to source a housing from a 77 but the closest one was two hours away so I'm just going to go with this one. And the sensor that I kept is the one from the upper left corner. I noticed on the 77 it has two wires, one to ground off on the housing and the other with the bullet connector. I'm just going to put this one back on and see if it works.

[EuroDat]

Looking at this photo, the only thing you are missing is the temperature sensor for the EFI.

The brown senso (top right) is the thermotime.

The bullet connector sensor under it is the temperature sensor for the dash gauge.

The sensor with the single black wire is for the 280ZX and is not used on the 280Z. I think it is for the blower to fan the fuel injectors, but Im not firmiliar with the ZX. You can remove this sensor and fit the EFI temerature sensor.

The vacuum switch can stay or remove it and plug the hole.

If you follow the link below and scroll down, there is a diagram with all three sensors and the wiring. They connect into the harness under the fuel rail between injector one and two.

http://atlanticz.ca/zclub/techtips/runningrich/index.html

Chas

[Zed Head]

I'm thinking the same as EuroDat. The one that you saved is a switch that you won't use. Do you have the upper left item connected to anything? The lower right is for the temperature gauge in the car. Keep that one. It use's a yellow wire with a female bullet connector. Probably in that harness you had in your hand in Post #4.

The one that you took off with the extra wire to ground is also a switch, I think it's the one for the second pickup in the distributor. Have you had the distributor cap off yet? You might not even have a second pickup. You don't really need that switch, the engine will run fine without it. It's a fine detail that Nissan added to perfect warm-up.