[Traildust]

Is the 1/8 npt plug by the oil filter the best place to put the sender for oil temp? I am starting to see the ECT/EOT on my Scangage differ as much as 22 degrees so I want to install a different source for oil temp.
Thanks,
Bill

 

[RT]

Yes, that's the best place. BUT- that is pre-cooler oil temp and the sender on the HPOP is post cooler so your values will be different.


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[klhansen]

Not sure about the 02, but the 01 and earlier 7.3L's don't send a signal from the ECT sensor to the PCM, so your scan gauge wouldn't be able to read it. I've gotten way weird readings (colder than ambient temp) for ECT with AutoEnginuity, but since the ECT signal only goes to the instrument cluster, AE must just be making something up. You may be seeing the same thing.

 

[RT]

Absolutely right. I have a separate coolant temp gauge so it didn't register the value he was comparing was the made up ECT number on the ScanGauge.


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[Googs]

Absolutely right. I have a separate coolant temp gauge so it didn't register the value he was comparing was the made up ECT number on the ScanGauge.


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RT, what's the normal operating temp for your motor (under load) from the separate gauge you have?
Just for reference.

 

[Googs]

Here's a list of sensors the PCM see.

 

[Traildust]

I learn something new on this site almost every time I come here, thanks guys. The numbers I have been seeing on the Scangage for ECT seemed pretty accurate to me once the engine is warmed up, before that ECT would go up to 260F. Like I said once it would get to some temp value for a warmed up engine the reading would drop down and seem normal compared to what I am seeing on the EOT. So maybe I need to run a temp gauge off the Tstat housing also?
Is there a way to read EOT at the HPOP, can you tie in a temp sender to read actual temp? I am beginning to not trust what the Scangage is saying.
I know I may be getting a little anul over these reading but it's just that for years now my ECT/EOT delta has never been more that 14 degrees on the Scangage . I think I might feel better with true gauge hook ups. Heck, you cannot have enough gauges to watch anyway. This is a 6 speed, if that makes a difference.
Bill

 

[bigb]

Did you guys forget that the manual tranny trucks do report ECT to the PCM?

I noticed my delta seems to be growing also (DiPricol ECT gauge & Torque Pro EOT). Thinking it may be time for an oil cooler rebuild/replacement?

 

[klhansen]

Did you guys forget that the manual tranny trucks do report ECT to the PCM?

I noticed my delta seems to be growing also (DiPricol ECT gauge & Torque Pro EOT). Thinking it may be time for an oil cooler rebuild/replacement?

It's the vans that report ECT to the PCM as well as the temp gauge. Definitely not the pickups (for sure the 99-01 models.)

 

[RT]

RT, what's the normal operating temp for your motor (under load) from the separate gauge you have?
Just for reference.

The engine never, and I mean never goes above 180° F. Engine oil temp will climb to high 190s if I'm towing really heavy (10-12K) at 70 MPH.

 

[ArcticDriver]

I learn something new on this site almost every time I come here, thanks guys. The numbers I have been seeing on the Scangage for ECT seemed pretty accurate to me once the engine is warmed up, before that ECT would go up to 260F. Like I said once it would get to some temp value for a warmed up engine the reading would drop down and seem normal compared to what I am seeing on the EOT. So maybe I need to run a temp gauge off the Tstat housing also?
Is there a way to read EOT at the HPOP, can you tie in a temp sender to read actual temp? I am beginning to not trust what the Scangage is saying.
I know I may be getting a little anul over these reading but it's just that for years now my ECT/EOT delta has never been more that 14 degrees on the Scangage . I think I might feel better with true gauge hook ups. Heck, you cannot have enough gauges to watch anyway. This is a 6 speed, if that makes a difference.
Bill

I have a Scan-Gauge II and my Delta is: EOT always reads about +14*F above the ECT once engine is at operating temp.

Trust the EOT value and not the ECT.

As previously mentioned, the ECT is derived as a function of other readings since there is no Coolant Sensor, it approximates its value. The ECT formula that is used in the PID is not very accurate.

Also, the PID for the SC-II ECT has two temperature ranges. It will read a bogus value of 200*+ until the coolant temp reaches about 125*F and then it will drop down to the 100* number range.

NOTE: I do have a 4R100.

If you want to check if your EOT sensor is working correctly, compare its temp first thing in the morning with a cold engine against IAT.

Cheers

 

[ArcticDriver]

The engine never, and I mean never goes above 180° F. Engine oil temp will climb to high 190s if I'm towing really heavy (10-12K) at 70 MPH.

RT,

Have you ever checked what your real gauge numbers are against your SC-II numbers at the same time?

 

[RT]

Yes - it was comical. My ECT on the ScanGauge warmed up and then topped out over 400°, then it plunged down to mid 150s and then rose again. It does stay close to EOT after that, but obviously my coolant didn't really get to 400. I'm not sure what the PCM does with that generated number if anything. I know from experience that if you drop a digit in programming an X-Gauge, you get data - seeming real data - of what, who knows. Black magic, I say!

 

[bigb]

It's the vans that report ECT to the PCM as well as the temp gauge. Definitely not the pickups (for sure the 99-01 models.)

hmmm never knew that. There's a lot of guys saying some of the 99-03 manual tranny trucks do. Maybe it started with the major electrical changes they made in 02. I did see it referenced here but I don't know what years that diagram is from http://ww2.justanswer.com/uploads/AU/Autotech58/2013-05-18_181104_temp_sensor.jpg

 

[Traildust]

That diagram bigb just posted matches my truck. It has two temp sensors, one on the TSAT housing and the other is on the front of the block passenger's side underneath the A/C compressor. One goes to the PCM and the other to the dashboard. I guess I could disconnect them one at a time to find out which is which. I know that with the engine completely cold the scangage reads ECT 160, EOT 62 the oat was 65f. Looks like EOT is reading ambient air temp and the ECT I do not know. It stayed at 160 even with key on. I guess we know that my 02 6 speed does have a ECT signal to the PCM but I still do not know why my ECT/EOT delta is growing?
Bill

 

[klhansen]

In 02, Ford added the second ECT sensor, but only for the Manual Tranny models. The original ECT sensor located on the thermostat housing like the 99-01 trucks still only goes to the instrument panel.
Here's the blurb from the service manual.

Engine Coolant Temperature Sensor (ECT) — With Manual Transmission Only

The Engine Coolant Sensor is used as the primary input to the Electronic Control System to enable adaptive cooling. This provides a means of providing adequate cooling in severe engine temperature conditions. When ECT is greater than 107°C (225°F), the fueling rate of the engine is modified to provide cooling protection and prevent engine damage due to overheating.

 

[Traildust]

Thanks klhansen for the info. Adaptive Cooling, now I wonder what this could be and why only the 6 speed has the second sensor to the PCM. Is the mod to the fueling where it cuts back or even shuts fuel off to some of the cylinders?
I am going to run a water temp and oil temp gauge just to compare the direct reading to the scangage. I know last Summer when towing our 11500# 5th wheel through the Sierra I saw EOT as high as 240 and ECT following along at 225 and so something should have happened, not even the fan kicking in. The direct readings should give me the answer I think.
Thanks to All,
Bill

 

[Googs]

We'll all be interested in the true readings you get with the gauges compared to the ScanGauge11 .
The SG get it's info directly from the OBD2 port so you'd think either one of your temp readings should be correct. (EOT, ECT )

 

[klhansen]

Thanks klhansen for the info. Adaptive Cooling, now I wonder what this could be and why only the 6 speed has the second sensor to the PCM. Is the mod to the fueling where it cuts back or even shuts fuel off to some of the cylinders?

I don't know the particulars, but I'm thinking the way they do it is to cut back on the fuel injector pulse width (how long the injector solenoid is active). That would reduce the fuel injection across the board, and would be pretty easy to program in. Just a parameter that looks at ECT and reduces FIPW by a percentage for ECT over a certain value.

 

[BS Hauler]

I have an 02 manual and when I have been in the mountains with my horse trailer weighing in around 18,000# I have seen ECT up around 235* before the fan kicks in and the oil temp around 250*. I think that with the manuals they found that guys were lugging the motor too much with high water temps. With an auto you can't do that. I am running ISS Pro gauges also and not reading from the OBD 2 port.