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Anyone know what the normal oil pressure is at idle for the 5.0? My sensor is reading (from EOP_PRESS(kpa) PID) is reading 70-90 kpa at idle. This converts to roughly 10-13 psi. This seems low to me. My understanding was that Ford's spec was anything above 15 was considered nominal. Anyone else know what their reading is at idle or know what it should be? I used Forscan to grab this.
Have an 01 that's the same. Disappointing to hear the 18 model still uses an idiot light/.
Probably because lots of people that don't know any better would drive themselves and the dealers nuts if they saw the gauge go from 70 psi on cold starts to 15-20 psi at hot idle and fluctuate with any throttle input while driving.
Probably because lots of people that don't know any better would drive themselves and the dealers nuts if they saw the gauge go from 70 psi on cold starts to 15-20 psi at hot idle and fluctuate with any throttle input while driving.
Yep. My manly man truck has an idiot light and my Mrs. girly girl car Miata has a real gage. Sad.
The 2.7L Ecoboost, and 5.0L both have analog oil pressure sensors, as seen in this schematic:
Actual oil pressure data is sent to PCM, but the oil pressure gauge image in the instrument display only shows ZERO, or about half-scale. Oil pressure variations cannot be seen.
The 3.5L Ecoboost uses a normally open SWITCH for an oil pressure sensor, which closes at around 7PSI of oil pressure. This can be seen in this schematic:
As RL1990 said, the instrument panel oil gauge is just a go/nogo analog substitute for an idiot light.
Yeah, the IPC gauge is switched, 7 psi or higher. The data was logged via Forscan and graphed with a script I wrote to analyze my outputs. This graph could have just as easily been put into Excel though since all it is is the EOP_PRESS(kpa) PID vs. RPM.
I was asking because I've seen on the stang forums that they are typically in the high teens low twenties at hot idle. Mine just seemed low. Old modulars had a min. spec of 25 psi or higher from what I've read (although that might not be accurate). I ordered a service manual to check the spec. 7 psi seems low, but if that's the case, I'll just have to accept it for what it is.
If the spec is low, I'll bite the bullet and hook up a mechanical gauge...just don't want to have to answer the question "Who hooked up a mechanical gauge?" if/when Ford asks. I've got a nasty sounding bank 1 which is what led me to seeing what the readings are at idle.
The correct word is 'buffered'. The coolant gauge is the same way in plactically all cars, except a few sports cars (and most motorcycles). Operating coolant temp range is from about 185 to 235ºF, with the fan(s) kicking in close (but below) to the upper range (unless A/C is turned on, etc). Anything in that range and the gauge is parked at the same spot. It's typically the same with oil pressure, but not always. I much prefer real gauges all the time, but unfortunately it's rare to have that. But remember if you had a real oil pressure issue, the idiot light would light up right away, so no worries .
For anyone curious, this is what the spec is according to the service manual:
I went and looked at my data again and I have a number of values @ 600 RPM around 9.5 psi. The minimum is 9.427 psi @ 599 RPM. At the time, it was idle and in park @ normal operating temperature. So definitely on the low end...just not sure what to think about it. It's not enough to turn on the light but not in spec either. At 2000 RPM it's at 29-31 psi...so it's barely in spec there too. Definitely annoyed because my engine definitely sounds like it's got a slight low end knock but nothing dramatic. I'd expect lower numbers if oil pressure was the cause (bearing issues). I can't imagine just barely being out of spec to be enough to cause damage (or be a sign of a bad bearing)...then again who knows. With 24000 miles, I would have expected to be well within the nominal range...but guess not. Thanks for the comments!
07-14-2018, 04:43 PM
Normal Oil Pressure @ Idle 5.0
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