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HELP! No oil pressure on LT1

S

srmrvette

Guest
My '95 starts and runs fine, but shows NO oil pressure. Changing oil and filter made no difference. My '96 maual says the sending unit is both an oil pressure sending unit and a fule pump switch, so I assume the engine would shut down if there was no pressure? Where is the sending unit located on the engine? I could go look but at 15 degrees I would like to narrow it down. If the sending unit tests ok, what is the next step?
 

Rabbit

Well-known member
Joined
Dec 19, 2001
Messages
956
Location
sonoma ca usa
Corvette
2004 C5 coupe, MSGM & 2014 Cad SRX Crystal red
srmvette,
According to my manual, the oil pressure switch is part of the oil pressure sensor/fuel pump switch.

It is on the passenger side of the sending unit.

You might try turning the ignition switch to "on", but donot start.

Disconnect the engine oil pressure connection. If the gage moves all the way to the right you have a bad unit.

If it doesn't check for a short
to ground in ckt 331.

If thats ok you may have a problem with the instrument cluster.

Thats all I can find. Good luck.
 

vigman

Motor head!!!!
Joined
Feb 13, 2001
Messages
3,471
Location
Valencia, CA,USA
Corvette
88 Convert ( SOLD ) /1973 coupe 4 speed/1964 Vert!
Oil temp

Does the Oil temp sender seem to work correctly?

Most of the time ( I have seen ) the pressure sender to the gauge( or the wiring ) goes KAPUT.

NOW I"M NOT ADVISING YOU TO RUN THE ENGINE WITH NO KNOWN OIL PRESSURE

However play it safe and take it to a dealer.. they can test the sender unit and stick a manual gauge in that hole to tell the entire story.

And if you had no oil pressure.. the fuel system would shut down.

Mike
 
S

srmrvette

Guest
It appears I am safe because of the fuel pump interconnection. I STILL CAN'T FIND THE SENDER! I think it may be passenger side towards the rear. Is that correct?
 

c4c5specialist

Technical Advisor
Joined
May 29, 2001
Messages
3,682
Location
New Haven, Ct. USA
Corvette
Nope, but someday.
HI there,
The oil pressure switch, and sender is at the top of the engine, behind the intake.
It will be right at the parting line of the intake, with a 90 bend for the adapter that is screwed into the block.
Besttoyou, c4c5:hb
 
S

srmrvette

Guest
As soon as I touched the sender I knew that was the problem. Whoever replaced it broke it trying to get the socket on or off. Replacing it was a real PITA but I now show pressure. The sender itself does NOT shut down the fuel pump. The other sender must do that. When I plugged the terminal into the sender, I heard what sounded like a little motor run, even with the ignition off. It finally stopped, but WHAT WAS THAT?
Thanks again for the help.
 

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