In addition, did you test for spark and injector pulsing when it would not catch?
The ECT can be out of calibration without being out of spec. Thus the car won't start but it won't toss a code either. Imagine the ECT reporting a temp of 210*F when the ambient temp is 20*F. The reported temp is not out of absolute range (thus no code) but not correct for the situation.
The ECT can be out of calibration without being out of spec. Thus the car won't start but it won't toss a code either. Imagine the ECT reporting a temp of 210*F when the ambient temp is 20*F. The reported temp is not out of absolute range (thus no code) but not correct for the situation.
The ECT is Engine Coolant Temperature sensor. Unfortunately, I have no idea where is is located on a 4 cylinder engine.
Here's what it looks like:
Note that that if the outside air temp is below 50 degrees F that the test for the
ECT can be in error. This code may go away as the engine warms up, so don't dump the codes
on a cold engine
The ACT & ECT have the same thermistor, so the table values are the same
Voltages may be measured across the ECT/ACT by probing the connector from
the rear. A pair of safety pins may be helpful in doing this. Use care in doing it
so that you don't damage the wiring or connector.
Here's the table :
50 degrees F = 3.52 v
68 degrees F = 3.02 v
86 degrees F = 2.62 v
104 degrees F = 2.16 v
122 degrees F = 1.72 v
140 degrees F = 1.35 v
158 degrees F = 1.04 v
176 degrees F = .80 v
194 degrees F = .61
212 degrees F = .47 v
230 degrees F = .36 v
248 degrees F = .28 v
Ohms measures at the computer with the computer disconnected, or at the sensor with the sensor disconnected.
50 degrees F = 58.75 K ohms
68 degrees F = 37.30 K ohms
86 degrees F = 27.27 K ohms
104 degrees F = 16.15 K ohms
122 degrees F = 10.97 K ohms
140 degrees F = 7.60 K ohms
158 degrees F = 5.37 K ohms
176 degrees F = 3.84 K ohms
194 degrees F = 2.80 K ohms
212 degrees F = 2.07 K ohms
230 degrees F = 1.55 K ohms
248 degrees F = 1.18 k ohms
See the following website for some help from Tmoss (diagram designer) & Stang&2Birds
(website host) for help on 88-95 wiring Mustang FAQ - Wiring & Engine Info
Ignition switch wiring
http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif
Fuel, alternator, A/C and ignition wiring
http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif
Complete computer, actuator & sensor wiring diagram for 88-91 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif
Vacuum diagram 89-93 Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg
ECT can be in error. This code may go away as the engine warms up, so don't dump the codes
on a cold engine
The ACT & ECT have the same thermistor, so the table values are the same
Voltages may be measured across the ECT/ACT by probing the connector from
the rear. A pair of safety pins may be helpful in doing this. Use care in doing it
so that you don't damage the wiring or connector.
Here's the table :
50 degrees F = 3.52 v
68 degrees F = 3.02 v
86 degrees F = 2.62 v
104 degrees F = 2.16 v
122 degrees F = 1.72 v
140 degrees F = 1.35 v
158 degrees F = 1.04 v
176 degrees F = .80 v
194 degrees F = .61
212 degrees F = .47 v
230 degrees F = .36 v
248 degrees F = .28 v
Ohms measures at the computer with the computer disconnected, or at the sensor with the sensor disconnected.
50 degrees F = 58.75 K ohms
68 degrees F = 37.30 K ohms
86 degrees F = 27.27 K ohms
104 degrees F = 16.15 K ohms
122 degrees F = 10.97 K ohms
140 degrees F = 7.60 K ohms
158 degrees F = 5.37 K ohms
176 degrees F = 3.84 K ohms
194 degrees F = 2.80 K ohms
212 degrees F = 2.07 K ohms
230 degrees F = 1.55 K ohms
248 degrees F = 1.18 k ohms
See the following website for some help from Tmoss (diagram designer) & Stang&2Birds
(website host) for help on 88-95 wiring Mustang FAQ - Wiring & Engine Info
Ignition switch wiring
http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif
Fuel, alternator, A/C and ignition wiring
http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif
Complete computer, actuator & sensor wiring diagram for 88-91 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif
Vacuum diagram 89-93 Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg
I thank you vristang for just putting my quote but smokedya needed the help not me. And also the 92 mustang 2.3 motor came with 2 coil packs so he could check one or both of them. Don't know why you put my quote i'm no rookie to mustangs because that's my job and i have been doing it for a long time. I had other things in mine to try an help this guy when and if he make another post and if what we told him did not help him. Now thats why i do not come to this site that much because people love to try and show how smart they are but end up looking like fools.I come here to help people not to show how smart i am.
I think this was directed at me (though you're the OP John, not I).
You probably have a Motorcraft sensor in there now. Most folks go with a parts store replacement when swapping out sensors. I'd take a used Motorcraft sensor over a new parts-store sensor just about any day. So if the OEM sensor is up to par, I'd leave it be. This is even more important on your 4 banger since the ECT is used for your cooling fan (so you need it to be accurate so the fan comes on at the right time).
While it is still cold is when I would check for fuel and spark... but I don't blame you for staying inside and warm....
I know I won't be in the garage today...
Did you get stuck in yesterdays traffic? It took me 6hrs to get home... 3hrs to pass through Seattle
jason