Relocating the ECT

Trying to relocate the ECT after installing a coolant block-off gasket for the lower intake, and am having a hard time finding a good solution for mounting the ECT inline with the heater hoses. I know some of you here have done this before, but I couldn't find the answer when I searched.

Does anyone know of a good solution for fitting the ECT inline with the heater hose? Like maybe some kind of T shaped copper pipe fitting that the ECT will just screw into? Having a hard time finding anything that looks like it will work locally.

Also, the wires on the new model motorcraft ECT harness are white and unmarked, and the instructions don't say which wire goes to where. Does anyone know what wires go to where from the ECT harness to the 2 colored wires for the old ECT on the engine harness? or are we flying blind on this one and just hoping?


http://i1167.photobucket.com/albums/q639...ECT_01.jpg

http://i1167.photobucket.com/albums/q639...ECT_02.jpg

You can find the inline adapter you need on the later year Mustangs/Rangers with the dual plug 2.3. You can also make one using a Tee for plumbing and some adapters to screw into the sides for the hoses to connect to. Get the right size tee so that the sensor can screw into the top.

The ECT is a resistive thermal device (RTD), so polarity doesn't matter.

Here's a pic I stole showing how someone else did the sender for a temp gauge, I'd imagine you could do the same thing. Not sure where you'll want to do it though in order to get the best temperature reference. http://img10.imageshack.us/img10/1703/dec30241.jpg

^^^^^ I dont think its an RTD. RTDs have a positive temp coefficient of resistance (resistance goes up as temp goes up) and a linear transfer function. The ECT, ACT, and VAT are NTC (negative temp coefficient = resistance drops as them goes up) devices with a non linear transfer function. Some NTC devices are polarity sensitive.

Ah, I see. All I knew of was RTD vs. thermocouple. If it mattered why would Ford be putting identical wire leads on new ECTs? I wondered the same thing when I put on a new ETC a couple years ago.

As Jeff mentioned, here are the actual resistance/temp values. Needed this when I was troubleshooting an overheating issue...

http://natomessageboard.com/uploads/0000...ensors.jpg

So, we all pretty much agree that it doesn't matter what wire goes to where on the new ECT?

That tee piece is exactly what I was looking for. Does anyone know what the exact size of the hole that the sensor threads into is?

they put the same white color because the pigtail can be used on multiple vehicle lines and wiring colors vary.

If your TC is, "Mostly stock, and still running great", the original connector for the ECT will give you a clue as to which wire goes where. The connector will only fit the ECT one way!

Also, why would you want to relocate the sensor? This used to be a common practice on carbed engines to allow the fuel mixture to enter the cylinder at a cooler temp, allowing a denser mixture for more power. The only thing running through a TC intake is air, the fuel is injected right into the intake port of the head. Others have changed ECT location when using a "Stand Alone ECU", but if you are still running a stock EEC-IV, it's calibrated for the temp at the stock ECT location.

The original ECT connector is not the same as the replacement ECT's connector. Neither one would fit the other, and the wire colors are not the same. That is the point of this thread.

The point of relocating the ECT is because I installed a gasket to block off the coolant flow into the upper intake, for a cooler air charge. People over on TurboFord have done this before, and it does reduce the temp of the air passing through the lower intake.

So, no one here knows what wire goes to where on the new ECT harness? Did everyone here just wire randomly and hope, without actually testing resistances to see if it worked afterward? I can't be the first one to do this....