oil pressure

[Gandalf79]

Hey I just checked my oil pressure on my 79 fox and when it started cold it was hovering around 46 to 48 and at warm idle, it was at a consistent 22-24. Now I had to test this using an external oil pressure test kit that seemed to do the job but I don't think I had it fully tightened on the block. Wondering if I had fully fastened the adaptor, if the pressure would go up a bit from that22-24 line. I am reading that 20 psi is the minimum line of normal and I do not want to go below that.
I replaced oil sensor and the gauge didnt work but most of my gauges do not seem to be like the tach and oil gauges.
Just recently changed the oil with 10w-30 but I may change it again to hopefully get rid of any sediment in there.

 

[General karthief]

Are you lost? The fox forums are down the hall on the left, here let me help you move this ........

 

[JD1964]

22-24 at hot idle is fine. When you rev the engine a bit the pressure should go up. Does it? How high does it go?

 

[Gandalf79]

22-24 at hot idle is fine. When you rev the engine a bit the pressure should go up. Does it? How high does it go?

Yes the gauge reads a higher pressure. I am unsure of the RPMs I was at when I revved the engine but I believe it went back up into the low 40s.

 

[AeroCoupe]

Reinstall the mechanical oil pressure gauge with enough plastic line to get the gauge where you can see it. Run the motor and report back.

 

[Gandalf79]

Reinstall the mechanical oil pressure gauge with enough plastic line to get the gauge where you can see it. Run the motor and report back.

Okay I will do that this weekend. I am going to get it tightened on nicely to the block and fire it up again. and get back to you. Thank you.
Hoping I don't need to dive deeper into the issue aside from figuring out why the gauge isn't reading. Maybe need a new harness from the sensor to the cluster? Where is the tach reading from? Forgive my ignorance, I am learning as I go on this car. I am also looking for a diagram of the vacuum line for this car.

 

[85GTStangGuy]

I am also looking for a diagram of the vacuum line for this car.

You might find this manual to be helpful...

Digital copy

1979 Mustang Electrical & Vacuum Trouble-Shooting Manual (EVTM) (USB) | eBay

Title: 1979 Mustang Capri Electrical & Vacuum Trouble-Shooting Manual (EVTM) (USB). The 1979 Ford Mustang Electrical & Vacuum Trouble-Shooting Manual (EVTM) is a complete and comprehensive collection of wiring diagrams, schematics, electrical illustrations, vacuum diagrams, and troubleshooting...

www.ebay.com

Hard copy

1979 Ford Mustang & Mercury Capri Factory Wiring Diagrams (EVTM) - 0339503 | eBay

1979 Ford Mustang. Wiring Harness Overview. Vehicle Repair Location Charts. Component Location Charts. Component Location Views. Connector Views. Component Testing. Audio System.

www.ebay.com

 

[Gandalf79]

Okay I will do that this weekend. I am going to get it tightened on nicely to the block and fire it up again. and get back to you. Thank you.
Hoping I don't need to dive deeper into the issue aside from figuring out why the gauge isn't reading. Maybe need a new harness from the sensor to the cluster? Where is the tach reading from? Forgive my ignorance, I am learning as I go on this car. I am also looking for a diagram of the vacuum line for this car.

Ok I’m so I was able to get the oil pressure test gauge tight and fired the car up and I started around 48 psi at cold start and it was there for awhile then as it got to hot idle it didn’t go below 20 psi
See videos
Had a question on a hose line that seems to be coming off a port right next to the pcv valve but it’s not connected to anything at the other end
Included a photo as best as I could get it

 

[Gandalf79]

Last one was a video but it wouldn’t let me attach the file so I took a screenshot right after starting the car

 

[limp]

Last one was a video but it wouldn’t let me attach the file so I took a screenshot right after starting the car

That'll work.....

 

[Gandalf79]

That'll work.....

I think I am satisfied with the oil pressure and that it could be my gauge just not working. My tach is not working either so I have to figure that out. All the other gauges seem to work though.
On to the next thing!