Oil pressure shouldn't register at all until the engine starts and builds up pressure.
If the engine cranks & cranks & cranks before it starts even though it's warmed up already.
The oil pressure is zero when the engine is not running. The oil pressure sensor will read the low pressure for a second, when the engine first starts.
Most cars would not have any oil pressure until after the engine starts turning because the oil pump is driven mechanically off of the engine.
reading reading rollerskating
needs new coil or cdi box
If you put fuel into the intake and it starts and keeps running, replace the engine coolant sensor. If you put fuel into the intake and it starts but stalls it probably is a bad fuel pump or pressure regulator. Do a fuel pressure test. Need to know what model, year and engine you have to help you any more.
A bad catalytic converter can cause hard starts if it has become clogged. This produces excessive back pressure in the engine.
THE FUEL PRESSURE REGULATOR HAS A PROBLEM WITH IT. REPLACE IT AND IT SHOULD CURE THE PROBLEM.
Depends on the engine but severe engine damage will start to occur almost immediately. It will run a few minutes until it starts to overheat then the engine will seize. It will not take long to destroy the engine.
It is considered to be a low normal reading. Nothing to worry about unless it starts to go lower.
It's based on the air pressure measurement of the environment. Before it starts to rain pressure dramatically drops. That's particularly why some people have headaches before rains.
The very first thing you should see is the oil pressure gauge start to indicate pressure. (This is assuming you have an oil pressure gauge, but all large trucks have them.) If you don't have any pressure within five seconds, turn the engine off.