Gary
I will certainly be moving the sensor. I just want to be sure everything is OK before I do.
I can't actually dump data from the ECU but I have spliced into the signal and ground for the ECT sensor - on pins 7 and 46 on the EEC IV respectively. Right, wrong or indifferent, I have used the following mapping for the voltage to temperature. (source:
ECT Pin Dead on EEC-IV? - Ford Mustang Forums : Corral.net Mustang Forum)
volt / temp (*C)
4.5 -40
4.4 -23
4.1 -7
3.6 8
1.4 57
0.7 82
0.4 106
0.3 123
The voltage starts at around 2.5V (cold - 28*C) and when hot drops to just under 0.7V (85*C - thermostat rating). It stays very close to this mark during all types of driving. Stationary idling will drop the signal further to just over 5V (about 90*C) when the thermo fan kicks in.
So as far at the ECT sensor goes the engine is doing exactly what I would like it to be doing.
The question is - would there really be 30* difference between the front and the back? Or is there something else that is causing the difference.
Geof