rickyellow zee Posted August 3, 2012 Share Posted August 3, 2012 I just purchsed a water temp sensor for my 280zx turbo. Im looking for a CHTS but the local auto parts store reffered to it as a coolant temp sensor and said they were the same. They look the same to me but are they really? Thanks Rick Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted August 3, 2012 Share Posted August 3, 2012 The cylinder head temp sensor is on the side and had a 2 pin connection. The water temp sender located on the thermostat housing only has 1 pin. So if you can look at their website and see if they have a pic. I know AutoZone did. Quote Link to comment Share on other sites More sharing options...
rickyellow zee Posted August 3, 2012 Author Share Posted August 3, 2012 Mine has two. wires. looks same as the chts thats currently there. its not the sender so it must be the one. Quote Link to comment Share on other sites More sharing options...
cgsheen Posted August 3, 2012 Share Posted August 3, 2012 CHTS has the same type 2-pin Bosch connector that the injectors use. In reality, the sensor is the same (has the same temperature curve and resistance values) as the water temp sensor - but my water temp sensor (Nissan calls it a "Thermal Transmitter" - for the cockpit gauge) has a different connector (single wire) than the CHTS. The Thermotime Switch looks a lot like the CHTS, but can't be used as one. It's merely a switch that "turns on" at high water temperature - it tells the injector fan to run when you shut the engine down. I don't use mine - no "hair dryer" on my turbo swap... The CHTS will have a resistance value that changes with temperature (chart is in the FSM). The thermotime switch will only show "open" or "closed" circuit when tested with an Ohm meter. Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted August 3, 2012 Share Posted August 3, 2012 While we are on the topic, can someone verify if the chts reading is used for fuel calculation? My car is running very rich and the chts is giving low resistance. Does it tell the ecu that the cars cold so dump more fuel? My afm is also off, but could a junk chts throw off the fuel reading by a notable difference? Quote Link to comment Share on other sites More sharing options...
Tony D Posted August 4, 2012 Share Posted August 4, 2012 yes, CHTS/Water Thermosat Temperature is the largest raw correction to fueling you have! Unplug it, and you should flood the engine out! Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted August 4, 2012 Share Posted August 4, 2012 Changed my chts and it was bone dry. Car hadn't been started for a few days. I'm guessing coolant drains from the head into the block? Sidenote, car ran better, but is still having trouble revving. I'll replay with a new afm on monday. Quote Link to comment Share on other sites More sharing options...
Zmanco Posted August 5, 2012 Share Posted August 5, 2012 The CHT sensor is not in the coolant circuit. Hence you can remove it an no fluid will escape. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.