I have a 93s10 and a 95lt1 in my truck and the oil pressure gauge goes up as i drive and when i sit at idle it goes almost down to 0 and my ''check gauge'' comes on. what could this be? like i said as i strt to drive, it goes up to above 40+

 

First thing to do is put a mechanical gauge on it to see what the pressure is really doing. It could be an issue with the sender or an incompatibility with the LT1 sender and the S-10 dash. It could also be a worn out engine. The mechanical gauge will tell you if you have serious problem, or a funky dash.

 

Where did you get the sending unit ? Is it a GM piece ? A lot of people have been having trouble with the ones from auto parts. (me included) If thats you problem look in my sig. I have one

 

i think i did get one from autozone when we first put the motor in the truck. have a wiring harness that was custom built for that motor to be in there in that truck, so i would assume that would meant hat all my guauges should work accordingly and not read incorrectly. but i dunno, lol. I just dont want to drive it if its going to affect the motor since i just got the heads redone and the motor rebuilt

 

ok, i called GM and they said that its going to be either a 1/8 inch thread or a 1/4 inc thread, any way to check them out besides pulling the old one out to get the right one?

 

check the oil sending unit

 

im gonna check the pressure with a gauge but besides measuring the old one, any way to get the correct sized thread before pulling the old one out? I dont want to have to wait if i need a new one. Rather already know the right one before pulling out the old one.

 

1/8" npt.

 

npt? And i dropped off money at the shop for the swap and he said that was a part we replaced, but it was a autozone one, so it could be a crappy sending unit?

 

when i just replaced my oil sending unit from what i thought was the factory to one from a autoparts store it reads 10 less than the original one i took out

i haven't confirmed the pressure yet

 

Like mentioned, you need a manual gauge.

 

well i got a guy at work that has one so we are going to look at it with his gauge. I hope its not too serious.

 

Well apparently i didnt have time to do the manual gauge with my coworker yesterday, so i want to know if anyone knows the part numbers to gmpartsdirect.com for the oil sending units. I am going to buy a GM one and put it in.

djjab what size is yours? I called the GM dealer and she said theres two differnt ones, one with a 1/4in and one with a 1/8th inch threading. I am not sure which i will need.

 

I have a acdelco one in the box for my build, thinking of going to full mechanical gauge however. Will check the part # tomorrow.

Another reason I want to go mechanical is that when i did my white gauges, I might have not put the needle back on correctly for the oil pressure side. I want something more accurate. Anybody have any good gauge recommendations?

 

yours is going tpo be the 1/8npt. The reason i know this is because your engine is out of a 95. The 1/4npt is the one that originally came on my 93 trans am which is located above the oil filter on the side of the block. I have recently got rid of the factory one and modified to fit the later model 1/8npt that goes on the top of the block behind the intake manifold.

Oil pressure sensor GM part #'s (provided via shbox.com)
93-94 (1/4npt) 24575127
95-97 (1/8npt) 10201491

 

Mine is the 1/8 thread, the one that goes on back of the intake. I needed the 1/4 that goes on the bottom

 

Well i ordered the 1/8th inch one from GM today, will see it tomrrow, so i hope to have the old one out today and new one in tomrrow.

also, do i need a special tool or wat size socket can i use to take the sending unit off?

 

nobody knows what size socket i need for this?