Oil Pressure - Requires Restart

[highjaxx]

Occasionally on cold start I lose oil pressure while backing out of the driveway. Gauge drops to “0” and check gauge light comes on etc. I can fix/reset by restarting the truck.

I’m leaning toward oil pressure sensor itself. Anyone know if this would be from electrical gremlins around the ignition switch?

Thanks

 

[Missouri Mule]

How steep is your driveway? Do you have enough oil in the crank case?

 

[highjaxx]

Not steep. Going to replace the oil pressure sensor in the next few days. Took a glance and it won’t be as easy to access as I hoped. I’ll post after

 

[Tuesdak]

Immediately change the oil. (One of many examples of oil failure: fuel/biodiesel contamination can thin the oil out.) Send a oil sample out. Cut open the current oil filter and inspect it. Put a mechanical gauge on it.

It's a bad assumption the gauge alone is malfunctioning without verifying it. It can go both ways where a 3rd rebuild one finds the gauge itself is bad...

 

[Mikey-KE7LBB]

The last time an actual sending unit was used was for the '02 models. From 2003 to this day, they all use a pressure switch! Can't remember if it's a 6 or 10 PSI switch, but I do know that the ECM looks for a signal for 30 seconds before the "Check Gauges" light comes on!! Sadly, all of the newer trucks use an algorithm to tell you what the oil pressure should be, instead of what it really is...

It's summer now and I see 50-75 PSI (actual) on a cold start and go. And around 25 PSI at idle when it's up to full operating temp... Fake gauge on dash never shows less than 40 PSI. I also have a bypass filter that lowers what it should be, but I'm still in the safe range.

A company I worked for lost an engine in an '07 Ford 6.0. It happened a short time after it had a "Check Gauges" light that popped on and went away with each start. I know it's not the same engine, or problems, but they all use the same method of telling the needle on the dash where to point!!

Please don't dismiss the issue since all of the newer trucks use a pressure switch! Check it with a mechanical gauge first!!

Remove the 1/8 NPT plug on top of oil filter housing, and add a pressure gauge that fits, or a gauge hooked to a standard grease hose will also work.