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Somewhere in the area of the two sparkplugs there should be a temperature sender(or switch) screwed into the head that the mystery wire is supposed to be connected to .
The passenger side head has the radiator fan switch to kick the fan on at 215 or so which I just replaced recently.
In the 1st picture up on top on the intake manifold by the thermostat is a sensor (2 wire yellow/black connector) that I thought is for the coolant temp sender for the dash gauge?
Last edited by bowtie-usa; 07-30-2017 at 12:48 PM.
The passenger side head has the radiator fan switch to kick the fan on at 215 or so which I just replaced recently.
In the 1st picture up on top on the intake manifold by the thermostat is a sensor (2 wire yellow/black connector) that I thought is for the coolant temp sender for the dash gauge?
The black/yellow one is for the ECM .
Rather than rely on one sender to tell the ECM , and then the ECM tell the gauge as most folks think it does , on our cars there is a temp sender/switch for each function .
One for the ECM , a second for the radiator fan (which is also controlled by the ECM*) and a third for the dashboard gauge . If you had a TPI with a separate "cold start injector" then there would have been a fourth one for that . A final fifth (or fourth in your case) would be the "IAT" (Intake Air Temperature) sender mounted somewhere in the air induction system .
* The radiator fan can run from either it's own temperature sender(switch) or from the ECM sending it a signal just in the same way as the fuel pump can run from it's oil pressure sender(switch) or from the signal the ECM sends it .
bet ya didn't think you had that many temperature measuring devices kicking around under the hood , huh ?
Last edited by OrangeBird; 07-30-2017 at 01:26 PM.
07-30-2017, 12:22 PM
bet ya didn't think you had that many temperature measuring devices kicking around under the hood , huh ? 