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I wish I still had my 6.2L, or I'd hook up Forscan and see what it said.
I have been waiting 4 months for Helm to get service manuals in stock for my '24 7.3L too...
Crazy idea....idle the truck when done traveling for an hour or so and don't sleep.
i'm ahead of you. I figure it'll happen soon. Heading out to California from NH this coming weekend. One way or ther other I can find out. I did have my foot on the brake as I tried to sleep to prevent it from shutting down after 20 min or whatever the timing is on this one.
Straight from the manual. If there is a reference voltage and a signal circuit, that says to me there is an ability to monitor changes in pressure rather than just a binary value. Yes, the PCM derives the pressure from the signal voltage.
Engine Oil Pressure Sensor - 6.8L,7.3L Gas, 7.3L DieselThe engine oil pressure sensor is hardwired to the PCM through VREF, signal and return circuits. The PCM provides the sensor voltage supply on the VREF circuit and monitors the voltage changes through the signal and return circuits as the engine oil pressure changes.
Pinpoint test M to determine whether the oil pressure control solenoid is functional, which I understand defaults the oil pump to maximum output by removing the hydraulic control and allowing the spring to swash the vanes to max. This also tells me you can in theory permanently defeat the variable output functionality. It's also sad to see they decided to reduce idle oil pressure by at least 40psi.
The other thing that tells me the oil pressure sensor is a variable sensor and not just a switch that opens and closes, and that the PCM oil pressure is not made up....with the "key" on and engine off, the EOP_PRESS PID reads 14.7 psi and the sensor voltage is just under 0.5V. What does 14.7psi correlate to? Atmospheric pressure at sea level which jibes because I am on the left coast of FL. The PCM reports the oil pressure as abs. It just stands to reason in my mind the PCM needs to know what the oil pressure is if it's going to control it via some unknown to us operating parameters.
I'm not trying to argue, I don't personally care how ford did it previously. Just reporting what I found based on reading the factory manual for my truck, and then doing some experiments with forscan with the hopes that it provides some small benefit to folks like myself who are here because they're genuinely curious about this stuff.
That bit of info would've been nice to know at the start. Thanks for posting that. Looks like Ford is headed back in the right direction with, hopefully, a real sensor.
Now, why can't aftermarket tuners read the info from the PCM, and why can't the number be displayed on the instrument cluster?
Hopefully someone good with programming can figure out a solution soon...
Where is the oil pressure sending unit switch located on a 2022 7.3?
I’d like to connect an electronic oil pressure sending unit and gauge to that same port. Sense the factory gauge is nothing more than an idiot light with a needle instead of a light bulb.
It's under the intake manifold. Which is also why service data has you remove the oil filter and use an adapter to check oil pressure with an analog gauge rather than using the sensor port.
Originally Posted by GetMore
While anything is possible, the fact that there were three different pressure readings makes me believe it is an actual reading. (They were 95 on startup, 21 at idle, and 51 @2k in drive.) I could see a 2 level sensor (bad/good/high), but three or more seems excessive. Might as well use an actual transducer at that point.
If we want 'proof', without installing a manual valve I would try seeing what happens at cold startup. If the pressure curves down it should be safe to say it is 'actual. If it only has those three (or four, for zero pressure) then it could be 'fake'.
Your last comment was done in the first two screenshots I posted in #62 on Saturday. It also left no question that the pressure PID is legit, for one due to the 14.7psi reading with the engine off, and two how is the PCM going to control oil pressure if it doesn't know what it is to begin with?
Originally Posted by Dozzer
And on Mororcraft Blend Oil, not even Amsoil you daredevil lol.
To spark more controversy lol.... I have been running Delvac-1 ESP 5W40 since 1,000 miles.
i'm ahead of you. I figure it'll happen soon. Heading out to California from NH this coming weekend. One way or ther other I can find out. I did have my foot on the brake as I tried to sleep to prevent it from shutting down after 20 min or whatever the timing is on this one.
Get near tucson or Arizona for that matter, let me know if you need something.
It's under the intake manifold. Which is also why service data has you remove the oil filter and use an adapter to check oil pressure with an analog gauge rather than using the sensor port.
Found it (OIL SENDING UNIT) and posted, post #102. Good luck removing it without pulling the engine or intake manifold. I can just barely reach my hand back there to touch it.
Confirmed the PIDs are available on pretty much any OBDII phone app. This is just the free OBD-MX app from the adapter manufacturer.
I suspect the way the PCM reports oil pressure is the reason you don't see the oil pressure PID available on other dash monitors like the idash. It'll cause too many questions because most everyone knows oil pressure as psig and they either don't know how or don't want to convert the abs value to gauge by removing the baro pressure.
Confirmed the PIDs are available on pretty much any OBDII phone app. This is just the free OBD-MX app from the adapter manufacturer.
I suspect the way the PCM reports oil pressure is the reason you don't see the oil pressure PID available on other dash monitors like the idash. It'll cause too many questions because most everyone knows oil pressure as psig and they either don't know how or don't want to convert the abs value to gauge by removing the baro pressure.
Note the pressure with the engine off.
damn that’s slick. Thanks for the value you’ve added to this thread. Unfortunately, someone who got their lunch money stolen in school will be along to discount your efforts. But most of us appreciate the effort you’ve taken here.
damn that’s slick. Thanks for the value you’ve added to this thread. Unfortunately, someone who got their lunch money stolen in school will be along to discount your efforts. But most of us appreciate the effort you’ve taken here.
Appreciate it. Everything I posted is available to anyone who can read and comprehend.
People have helped me in various forums along the way, just glad I was able to contribute something of value.
First off, thanks to those in this thread that have contributed valuable information.
I have been watching the 7.3 oil pressure at idle stuff carefully as I have a 2020 7.3 that I idle a lot, sometimes over 10hrs a day. Currently at 2400 idle hours.
At first when I saw the info posted with the pressure data from the PID EOP_PRESS on the 23 I thought this is probably because they changed the sensor on the 23s and my 20 just has a dummy switch.
I got Forscan fired up and I don't have a PID for EOP_PRESS like I susspected, HOWEVER I do have one for EOP_V(Voltage) which looks to be the raw volatage from the 5V sensor, OK thats something...
Also have a PID called "EOPDC_CMD" or Engine Oil Pressure Duty Cycle Comanded
So while monitoring this I started the already warm engine(it was sitting about 30min since full operating temp) and recorded those PIDs
It does appear the EOP_V is a actual 5V ref sensor PID which is great.
You can see the EOP drop correlating to the amount of duty cycle commanded from the solenoid.
This confirms what we have been hearing about the oil pressure being lowered at idle electronically.
My next question, does anyone have a part number for the oil pressure solenoid control valve? Because I would like to plug it in and see if we could use it as a "dummy plug" and have the actual valve in default no pressure relief mode.
Also, where is this solenoid located on the motor?
First off, thanks to those in this thread that have contributed valuable information.
I have been watching the 7.3 oil pressure at idle stuff carefully as I have a 2020 7.3 that I idle a lot, sometimes over 10hrs a day. Currently at 2400 idle hours.
At first when I saw the info posted with the pressure data from the PID EOP_PRESS on the 23 I thought this is probably because they changed the sensor on the 23s and my 20 just has a dummy switch.
I got Forscan fired up and I don't have a PID for EOP_PRESS like I susspected, HOWEVER I do have one for EOP_V(Voltage) which looks to be the raw volatage from the 5V sensor, OK thats something...
Also have a PID called "EOPDC_CMD" or Engine Oil Pressure Duty Cycle Comanded
So while monitoring this I started the already warm engine(it was sitting about 30min since full operating temp) and recorded those PIDs
It does appear the EOP_V is a actual 5V ref sensor PID which is great.
You can see the EOP drop correlating to the amount of duty cycle commanded from the solenoid.
This confirms what we have been hearing about the oil pressure being lowered at idle electronically.
My next question, does anyone have a part number for the oil pressure solenoid control valve? Because I would like to plug it in and see if we could use it as a "dummy plug" and have the actual valve in default no pressure relief mode.
Also, where is this solenoid located on the motor?
Look at post #128 above/below.
Last edited by Member No. 1; May 23, 2024 at 11:47 AM.
Reason: Corrected post number
