Oil pressure gage

I think I probally known the answer to this question, but was wondering if anyone has had this same problem. The oil pressure on my 75 stays around 40 psi, unless you give it some gas, then it will max out. I have checked all the wiring, and made sure that no wires are shorted, and that there isn't any hot air leaks around my headers. I believe it's a simple problem with the oil pressure sensor. Does anyone agree with this, or has anyone had similiar problems? Thanks for any input.

I have the same problem, but on my S-10. And it's not very old. I sounds to me like the sending unit though. Good luck with it.

I've seen several 'posts' on various Vette forums where the oil pressure gage is erratic or just weird. I'm starting to believe it's a Vette Gremlin that effects most C3 owners. Mine usually just hangs around 40psi most of the time.

90 percent of the time an erratic reading or an extream one way or the other is due to the sending unit. GM seem to have a bigger problem with this than the other car lines. I have probably replaced over 100 GM oil senders for this reason, and perhaps 25 of everyone elses. Most of the failures were on the 2.8 and 3.1 liter engines, but I have seen it across the board.

Ken Styer

Hey Bill,

As a fellow 75 owner, let me tell you that I have had the same problem from the start. I have learned to live with it instead of changing the sender like Ken suggested. Too lazy I guess.
Glenn

I sort of agree. It just started one day and I have kept a eye on it. It seems to ony "max" out when I am accelerating. If I'm at idle, or decelerating, it will stay around 40psi. I think changing the sender unit will fix it. It's not a big expense, I think around 12 bucks, but I agree, I have bigger fish to fry and just haven't found time to change it. I was just making sure it wasn't something else that I was overlooking.

I had a similar problem with a 73. The final outcome was a stopped up passage to the sender. I removed the sender and disconnected the coil and turned the engine over, the stoppage kind of just "blew out" It's a messy ordeal though.

Thanks, I think I'll try the blow out. Seems to make sense.

Bill

Yah ,its a good idea to do that every once in a while the oil gets up in there ,next to the sender and gets locked in there,no place to go starts plugging up pull the sender crank the engine over a couple times,install a new one it SHOULD work fine,

On mine ('82 CE) it hangs around 40, but sure is jumpy. Anyone elses do this?