Hey--
Buddy of mine has a 1991 f150, same vintage as my grand marq, and same engine block, the 302. Probably the same transmission.
He has an oil gauge proper, not the idiot switch, and it's reading low. Not naught, which is very good of course, but once the engine comes to life the needle swings just a little ways, too low to even enter the "normal" range. 180,000 miles btw.
Now, when I sit in the car and give it some gas, the oil pressure does not move, does not increase.
I have some options:
a) sending unit itself, although it is registering something, just not enough.
b) wire to the sending unit, dirtied or high-res fault eating voltage
c) how does the pressure regulator work? There is one, right? That is to say, when you're at 500rpm pressure might be 20psi, when you're at 1000rpm pressure might double to 40psi, but when you're at 4000rpm pressure stays at 40psi. Fictional but plausible numbers there. There's a valve that regulates and releases pressure so it never rises above what's sufficient? So... I'm wondering where this regulator is, and how it works, and ultimately wondering if a bad regulator could end up keeping pressure down too low? This comes to mind just because revving the engine does not result in proportionally higher pressure. If straight up worn main bearings were the cause, pressure should rise correct?
d) despite the musings of c), which is my real question here since I just don't know about how pressure is regulated, perhaps it is just worn rods and mains, a worn-out pump that's not holding pressure, or even a popped galley plug.
Buddy of mine has a 1991 f150, same vintage as my grand marq, and same engine block, the 302. Probably the same transmission.
He has an oil gauge proper, not the idiot switch, and it's reading low. Not naught, which is very good of course, but once the engine comes to life the needle swings just a little ways, too low to even enter the "normal" range. 180,000 miles btw.
Now, when I sit in the car and give it some gas, the oil pressure does not move, does not increase.
I have some options:
a) sending unit itself, although it is registering something, just not enough.
b) wire to the sending unit, dirtied or high-res fault eating voltage
c) how does the pressure regulator work? There is one, right? That is to say, when you're at 500rpm pressure might be 20psi, when you're at 1000rpm pressure might double to 40psi, but when you're at 4000rpm pressure stays at 40psi. Fictional but plausible numbers there. There's a valve that regulates and releases pressure so it never rises above what's sufficient? So... I'm wondering where this regulator is, and how it works, and ultimately wondering if a bad regulator could end up keeping pressure down too low? This comes to mind just because revving the engine does not result in proportionally higher pressure. If straight up worn main bearings were the cause, pressure should rise correct?
d) despite the musings of c), which is my real question here since I just don't know about how pressure is regulated, perhaps it is just worn rods and mains, a worn-out pump that's not holding pressure, or even a popped galley plug.
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