The oil pressure in my '67 Pontiac indicates 70psi when started cold. When fairly warm I get about 20psi indicated at idle and 40 or so at 3000rpm. After reaching running temperature the gauge shows 0psi at idle and maybe 20 pounds when rev'd. I'm using 20W50 oil and the pressure gauge is electric, using a 1967 pressure transmitter. What would cause this?
Anonymous
Favorite Answer
Pull the transmitter out, install a mechanical gauge on it to get a true reading....could save you a bundle down the road if you do have problems
fire4511
It could be a problem with the electonics or you could have amajor problems with the engine. As the previous answer said, check the oil pressure with a mechanical gauge to find out if you have an oil perssure problem or a problem with the sending unit!
Anonymous
Ensure correct oil-level in chamber and try again. If it fails, try to open up the rocker heads and take a look at it. If oil is retained there for a long time, you might need to service your guides. There should be no further problem related to this.
Truyer
Most likely the rod and main journals are worn-out, when the oil is cold and thicker the pump can build pressure, when hot its thin and it just can't keep up.
usedautopartguy
i had a 80 ford pickup that done the same thing 0 psi at idle is not a problem as long as it dont knock