Oil Pressure Problem

[Mat1asBEV&ICE]

Hi. I have run the engine a few times and a couple of go karts. Gen 3 Coyote, GPS gauges.

Pressure gauge was reading about 40 psi at idle. Then today I started it up and immediately goes 100 psi at idle.

What thing/s should I try to correct this issue?

Thank you!

[Jeff Kleiner]

Coyotes usually go to 100 on cold start then drop as they warm up.

Jeff

[Mat1asBEV&ICE]

Thank you, Jeff! I had not noticed that before (certainly didn’t happen on first start).

[nashuanuke]

Coyotes usually go to 100 on cold start then drop as they warm up.

Jeff

seconded, I just started mine for the first few times, starts high then goes to normal after a couple minutes. On a quick subsequent start it seems to "know" the engine's warmed up and oil pressure starts normal, I don't know what the PCM is reading to make that determination, temperature or something.

[gbranham]

On a cold start, the idle is held higher for 15 or 20 seconds. Higher RPM=Higher Oil Pressure. Wouldn't be surprised if the PCM has some sort of logic that says 'If I haven't been started in x minutes, hours, etc, start in the 'cold start' routine'. Probably also uses the coolant temp sensor, maybe even as the primary sensor to make that decision.

[Mat1asBEV&ICE]

Sure enough, it started dropping after several seconds and settled at 35psi at idle.

[CraigS]

I can confirm that my wife's 2015 Mustang GT in pure stock form does the same thing.

[Nigel Allen]

Not being particularly knowledgeable on the technical side of engines, am curious, what are the negative effects of high oil pressure?

Nige

[Mat1asBEV&ICE]

Nige, that is a good question. I’m not sure of the answer but my concern was that the gauge or sensor failed and thus I wouldn’t know if the pressure was low.

[J R Jones]

Oil pressure is typically regulated so "excess" is experienced before the regulator. There should be a spec on the regulator. That said the reality is the regulated pressure degrades through the system to the end of the oil gallies.
Cold oil is a challenge and oil filters have a relief valve that by-pass the filter element during cold start-up.

Years ago the Fram had street filters and racing filters (HP1). The race filters had high pressure canisters to go with high pressure systems and (thick) straight weight oil. I heard tails of street filter canisters blowing off the base plate on cold start.
jim