Socalsteve2021
Newbie
Hopefully this will save you hours of diagnosis and digging. MY 1988 K1500 350TBI 65K miles recently started showing very low oil pressure. Typically 30-40 suddenly went to 20 with RPM, 5-0 at idle. The check gauges light would even illuminate. After changing the oil and filter and doing a lot of digging, it turns out the 1988-1991 350's had two oil sending units. If you dig through the factory repair manual you will find them.
Sensor #1: is on top of the motor, behind the distributor. It's a 2-pronged connector and a PITA to get to. This sensor feeds oil pressure data to the ECU/Fuel Injection system and will cut the fuel pump if oil pressure is lost.
Sensor #2: is above the oil filter, below the exhaust manifold. This single wire sensor sends oil pressure data to the dash gauge. In the Pic below it looks like it's been leaking for a while. Part# PS269
So - after many hours of troubleshooting, panic from the 0 oil pressure reading, etc. the mystery is solved.
Sensor #1: is on top of the motor, behind the distributor. It's a 2-pronged connector and a PITA to get to. This sensor feeds oil pressure data to the ECU/Fuel Injection system and will cut the fuel pump if oil pressure is lost.
Sensor #2: is above the oil filter, below the exhaust manifold. This single wire sensor sends oil pressure data to the dash gauge. In the Pic below it looks like it's been leaking for a while. Part# PS269
So - after many hours of troubleshooting, panic from the 0 oil pressure reading, etc. the mystery is solved.
Attachments
Last edited: