Coolant temp sensor - Page 2 - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #11 of 13 (permalink) Old 08-04-2018, 07:04 AM
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Can anyone confirm that part no. 22630-N4200 is the correct temperature sensor for a 280z from 1977? I bought a part with this no., and although it looks the same as my old one, the seller said it was not correct for a 280z after I already bought the item.

Is the only thing you need to look at with a temperature sensor the thread size or are there also differences in the resistance of the sensor?
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post #12 of 13 (permalink) Old 08-04-2018, 02:52 PM
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This is what the correct ones look like, if you mean the sensor for the EFI system. It has the same two prong plug as the injectors. I have one of these sensors from this store on my engine now.

http://www.thezstore.com/page/TZS/PROD/11-3450
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post #13 of 13 (permalink) Old 08-06-2018, 06:34 PM
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Originally Posted by Peter_789 View Post
Is the only thing you need to look at with a temperature sensor the thread size or are there also differences in the resistance of the sensor?
Thankfully Nissan used coolant temperature sensors with the same resistance values for YEARS and across most of their product lines.

Remember that there are 3 different sensors in the thermostat housing in the early EFI Z's:
- Thermotime switch (2-pin Bosch connector closest to head, for EFI, controls the cold start valve - "On" at cool temps (below 57-72 degrees) "Off" at higher coolant temps - different style and mount than Temperature Sensor)
- Temperature Sensor (2-pin Bosch connector, for EFI, coolant temperaure sensor for ECU)
- Temperature Sender (single male bullet connector, for coolant temperature gauge in dash)

The Temperature Sensor (EFI) and Temperature sender (gauge) have the same resistance (Ohm) characteristics but totally different connectors. The Thermotime switch is closed circuit at cooler temperatures and open circuit at warmer temperatures.

1974 "early" 260Z - L28ET - MS3X full sequential fuel and spark, COP=Ford 4.6 coilpacks w/ Nissan Ignitor, diyautotune chopper wheel - FMIC - T04E .63 A/R - 400cc Injectors (too big!), 14point7 Spartan2 Wideband - C/R 5-speed - Coilovers - Big Brake Kit up front, Porterfield friction all around. Mesa, AZ
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