A reading of 56 psi at idle for a Ford Ranger can be considered normal, depending on the engine and model year. Most Ford engines typically have oil pressure specifications that range from 20 to 60 psi at idle, so 56 psi is generally within an acceptable range. However, it's important to consult the specific service manual for your Ranger model to ensure that the reading aligns with manufacturer recommendations. If there's a significant drop when the engine is under load, it might indicate a potential issue.
According to www. the ranger station . com ( no spaces ) the oil pressure on a 2.9 L is 20 PSI @ warm idle and 55 PSI @ 2000 RPM
Key on, engine off......35 to 45 psi Idle with vacuum hose connected .....25 to 35 psi w/out .....35 to 45 psi
My Chilton book shows , for the 1995 VIN " X " engine ( 8th " character " of the VIN ) ( 35 to 45 PSI ) My Haynes book shows ( 39 to 40 PSI and 30 PSI at idle )
High or Low Engine Oil Pressure Check related links below
at idle 13-20 psi Key on engine off 23-31 psi
ford book says 65 PSI plus or minus 8
At idle should be 13-20 psi With key on engine off should be 23-31 psi
On a 1995 Ford 4.0 liter V6 engine : I believe that is 39/40 PSI ( 30 PSI at idle ) fuel pressure
Minimum of 10 psi at idle, 20-30 at idle is average.Minimum of 10 psi at idle, 20-30 at idle is average.
For a 1994 Ford Explorer - 4.0 L : key on / engine off ( 35 to 45 PSI ) at idle with vacuum hose connected ( 30 to 35 PSI ) at idle with vacuum hose disconnected ( 35 to 45 PSI ) according to my Haynes repair manual
12 psi minimum at idle.12 psi minimum at idle.
35-40 psi while engine is off. 28- 35 psi at engine idle. -jonny b.