Cylinder Head Temperature Sensor, 0 280 130 017 Readings Options

[dlee6204]

I recently acquired a NOS temperature sensor for the one year only '73 Djet system 0 280 130 017. This sensor has been NLA for a very long time and finding a used one is very difficult. Given the rarity there isn't a lot of information on the proper resistance values of this sensor. Pbanders (https://members.rennlist.com/pbanders/DJetParts.htm) lists three data points for the resistance of this sensor but I thought I would post my findings. I also listed the values of the aftermarket sensor 0 280 130 012 available from 914Rubber.





@Superhawk996 This answers some of your concerns.

[adolimpio]

There was a suggestion to add a 2400 ohm resister in parallel to the 012 to make it equivalent to the 017 at 70 degrees. I added a third line to the chart to show what that would look like. Doesn't look like a good idea - running pretty lean a low temps!

[Olympic 914]

There was a suggestion to add a 2400 ohm resister in parallel to the 012 to make it equivalent to the 017 at 70 degrees. I added a third line to the chart to show what that would look like. Doesn't look like a good idea - running pretty lean a low temps!

The Cylinder Head Temps rise pretty quickly from those low temps. And from 80deg on they are pretty close. with the parallel resistor

I consider it a non-issue (JMHO)

It really depends on your engine.

I run a 1K resistor in parallel which theoretically should make my engine too lean at cold temps. But my wideband AFR tells a different story.

My engine will not idle nicely immediately upon startup. but once I drive 1 mile it is warm enough to idle (In my case, by the second Stop sign.)

One positive thing about the parallel resistor is if your CHT has a bad connection / failure, You engine will die on the spot. with the parallel resistor it will just go into a rich condition. You will still be able to drive on. I had this happen on the way home from Tennerpaluza. A little fiddling with the connection in the safety of a parking lot, instead of on the side of the road enabled me to remedy the problem and continue on.