86 6.9 idi no oil pressure at idle

[Dirty Bluford]

Hello,
Recently bought a 6.9 idi ran fine but parked on a hill it wouldn’t suck fuel. Fixed it and vented the system everything seems to run ok but now at idle it wont read oil pressure but the idiot light wont turn on. As soon as it get going oil pressure comes back up the middle. Do i have a faulty gage or idiot light?

 

[IDIBRONCO]

The factory gauges on our trucks aren't worth much. They're like an idiot light that moves a needle. The solution is to install an aftermarket gauge or gauge set. By the way, welcome.

 

[Cubey]

The factory gauges on our trucks aren't worth much. They're like an idiot light that moves a needle. The solution is to install an aftermarket gauge or gauge set. By the way, welcome.

Yep. My 87 F250, the last owner got scared by the factory gauge dropping enough to make the "ENGINE" light flicker at idle sometimes. He put in a mechanical gauge and pressure is fine.

 

[DrCharles]

On my '93 I jumpered the resistor in series with the gauge (on the backside of the instrument panel), and installed the proper sensor (variable) to replace the original idiot-light (either on or off) type. Now I have a stock gauge that actually shows changing pressure, although it's not calibrated in psi.

 

[backyard_mechanic]

I had the same issue with the gauge showing no pressure. Changed out the sensor snd it worked for a day and back to 0psi. Threw a cheap Napa gauge in and found out it had great pressure. Also if you’re not wanting a cheap ugly gauge cluttering up tour dash glow shift makes nice looking easy to wire in electronic gauges and nice pods. Cheap too.

 

[12pilgrim]

I had a huge scare when my factory gauge showed I was way overheating! Installed aftermarket gauges under the dash.. runs beautifully. Can't trust the stock gauges, they're just a novelty item. 86 6.9 F250

 

[Cubey]

I had a huge scare when my factory gauge showed I was way overheating! Installed aftermarket gauges under the dash.. runs beautifully. Can't trust the stock gauges, they're just a novelty item. 86 6.9 F250

My RV's water temp gauge was running pretty darn high when driving in very heavy head winds. It was probably accurate since the fan clutch was weak. I put an aftermarket gauge in before the fan clutch was replaced, and the fan clutch dropped temps by 10-15 degrees.

 

[Knuckledragger]

Don't be alarmed if you install an aftermarket gage and find low pressure. The engines idle with about 7 psi and run with 30, if I remember correctly. The magic is that the oil pumps put out a LOT of volume, so high pressure is not necessary, perhaps even counterproductive.

 

[Farmer Rock]

The oil pressure "gauge" on my 6.9 always went dead at idle, so I raised the idle rpm to 850rpm just for the peace of mind until I got real gauges.


Rock

 

[snicklas]

Don't be alarmed if you install an aftermarket gage and find low pressure. The engines idle with about 7 psi and run with 30, if I remember correctly. The magic is that the oil pumps put out a LOT of volume, so high pressure is not necessary, perhaps even counterproductive.

Yes, that is why they can get by with it… they move a lot of oil. Plus, there are 8 built in oil leaks……… (piston jets)