Oil Psi Gauge, sending unit, pump or combination, gone bad?

[DRAGONBALLER20]

Here's my deal. My I was driving fine and dandy, in my 91 gst, than just like that my alternator died. Did checks to make sure and it was gone. Bought new one installed it next day and thought I'd be set. Don't get me wrong, my alternator problem was fixed, but to my dismay, another problem arose. My stock oil guage is pinned on L and my oil light blinks on and off during idle at times and constantly comes on when accelerating but goes off when I let off the gas. When I turn the ignition on without starting engine the oil gauge goes all the way up to H but once running drops back down to L. Now, I know some possiblities are the oil sending unit is bad or connection is bad. I did try to better the connection but did not yet replace the sending unit.And while replacing the alternator I did plug and unplug the connectors to the sending units on top of a couple of stupid arcs from forgetting to disconnect the battery. My worry is that it is the oil pump, and the L reading on the gauge is true. Engine temp is normal and I don't seem to feel any difference in running condition. So I am definetely hoping it is the senders. If anyone has had this happen or can give me some sort of relief or grief about it being the oil pump, I woul greatly appreciate it!

 

[Defiant]

Wires or senders. You'd already know if it had been the oil pump.

 

[95talon_in_ma]

You did check the oil level right?

I had my ALT belt go the other day and when I changed it roadside I accidentaly disconnected the stock sender. My idiot light did not go on at all, so I knew I was safe and rather than getting back under the car at 100 deg in a suit 150 miles from home, I drove it. Got home and checked, sure enough it was fine once I connected back up.

There are two different senders for the oil. One for the gauge and one for the idiot light. If the idiot light was off all of the time, I'd say you did some wire damge to both. But since it is intermittent, I'd be cautious. Usually if the light goes off at idle, it's just the oil level. If it's full, I'd change the oil pump before you drive it again. Better to be safe than sorry.
At the same time I'd get an aftermarket oil presure gauge. Never a question again.

***
I just re-read your post. Your saying the light goes on when accelerating and off at idle?
Maybe you hooked the wrong wire to the wrong sender...Lol
I'd definitely check the wires and senders out. get the aftermarket while your at it...
Probably not the pump then..

Good luck!

 

[DRAGONBALLER20]

First off thanks alot guys appreciate your help. I do feel a little better . I am going balls out tomorrow to fix this problem. I have a mechanical oil psi gauge in my other car I'm going to use, it serves no purpose but for the look, it isn't even hooked up just the indiglo . I read on another thread to take the dip stickout, take off the oil cap and rev the engine to see if oil squirts out to check if the oil pump is working. I did this today before work since it only took a minute and oil was squirting out. Now is this a trustworthy test? Or could oil just be squirting out because of the moving parts in the engine including the engine or whatever? I just don't want to unnecessarily disassemble the front case and go through the time and aggrevation of it all to find out that's not even the case.

 

[BitAddict]

I have the same EXACT problem. It came out of know where! I replaced both sensors and still nothing has changed. Connections to both are good. When is say "EXACT"- i mean exactly the same symptoms. One can not hook up the sensors backwards because they are different connectors. I'll be watching this thread...

-bit