On my 1979 Chevy Pickup with a stock 350, I have no oil pressure when the engine warms up to normal operating temperature. When the engine is first started up, the Pressure is at around 40- 50psi, this is at idle. Once the engine warms up, all oil pressure is gone, and the needle has a tendency to jump up and down between about 0-5psi. When I am driving the Truck, my oil pressure is running at about 20psi. There is about 150,000mi on this motor.
I got this truck for free and when I first got it, the oil was thick like tar, the spark plugs were all full of sludge. When I would change my oil, the fresh oil would be black. I have since flushed the motor with motor flush, and the oil now appears to look almost clean. I think that my oil pump may be clogged up, but I am not sure. Is there a sending unit that sends the oil pressure to the gauge that could also be gone.
Any help please would be appreciated. Thanks.
Sorry, I forgot to post some specs on my truck. I am also using 10w40 motor oil.
1979 Chevy Pickup K10 4x4
Stock 350ci w/ exception of
Holley double pumper 4bbl 650cfm
224,000mi on Truck w/ about
150,000mi on Engine
I got this truck for free and when I first got it, the oil was thick like tar, the spark plugs were all full of sludge. When I would change my oil, the fresh oil would be black. I have since flushed the motor with motor flush, and the oil now appears to look almost clean. I think that my oil pump may be clogged up, but I am not sure. Is there a sending unit that sends the oil pressure to the gauge that could also be gone.
Any help please would be appreciated. Thanks.
Sorry, I forgot to post some specs on my truck. I am also using 10w40 motor oil.
1979 Chevy Pickup K10 4x4
Stock 350ci w/ exception of
Holley double pumper 4bbl 650cfm
224,000mi on Truck w/ about
150,000mi on Engine