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ECT Wiring Mishap
#1

I replaced the wires going to the ECT sensor because the wires were looking bad. I kept the plug and when it came time to feed the wires into the plug I referenced the Sensor.pdf that I downloaded from somewhere and it showed the signal return wire (black) close to the corner on the plug and the 5 V wire (green) on the other side.  So...I hooked it up that way.  Lately the car has been the shits to drive.  It lopes, almost stalls, the wideband shows 10 while cruising, and there is an intermittent bucking while cruise after startup......

So i pulled codes and got some continuous memory numbers..  42 (rich), 51 (ECT), and 65 (did not go into closed loop).  

When I was looking at the wiring again, I had the 2.3 Turbo wiring diagram near me, and it showed the 5 V (Green pin 7) in the corner of the plug, not the black signal return pin 46.  Therefore I had the wired crossed.......

With 5 V going to the wrong post on the ECT sensor, could I have damaged the sensor?
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#2

Nope, the sensor is just a resistor with a largish temperature coefficient of resistance, and the 5V from EEC is very current-limited, no damage.
2019 Corvette Grand Sport, 1LE
2008 Mercury Milan Premier
1999 SVT Contour
1989 Taurus SHO
1985 Mustang SVO
Must thin the herd...
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#3

Thanks for the info Gary.

I'll need to look at my ECT sensor then. If the wiring wasn't the cause for the code then probably its resistance is out of spec.
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#4

Make sure you don't connect EEC signal return (pin 46) to any other grounds in the engine or engine harness. Signal return is meant to be a clean, isolated ground for sensors such as ACT, ECT, VAM, and BARO typically. If signal return is tied to the engine block, or other under-hood grounds, it will get noisy and make for erratic engine operation.
2019 Corvette Grand Sport, 1LE
2008 Mercury Milan Premier
1999 SVT Contour
1989 Taurus SHO
1985 Mustang SVO
Must thin the herd...
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#5

Good info. Thanks.

Can ignition timing change over time, or from say a hesitation from the engine? I'm Looking further into my poor idle quality and the car lopes on a cold start. Sounds like the timing is off, but a month ago when I had an opportunity to che k the timing was spot on 10d.
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#6

Cam timing can only change if it skips a tooth.
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