I have a 94 chevy 4.3 vortec ....it takes for ever to start....right before it starts the oil pressure gauge goes up to normal then starts......after it starts it runs fine for a while then will randomly shut off...then i have to wait about 5 minutes then it will start back up but after awhile from turning it over....have any sugestions what wrong
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Both issues could be normal to a degree. The engine temp would go up some when the truck stops moving, and the oil pressure would go down some when the engine returns to idle. Are the two gauges reading out of normal range ?
Well it could be the sending unit for the gauge. But odds are the oil pump or engine bearings are worn out. As the engine warms up, the metal spaces expand and the oil gets thinner. The oil pressure drops some under normal conditions, but not more than 10 or 15psi. Normal idle pressure with the engine warmed up is probably 25psi. You could check oil pressure with a mechanical gauge to make sure its not the sending unit. Once the oil pressure starts staying below 20psi for long periods you'll start hearing noises.
15 is ok at idle, 10 will return the light on in the cluster. I would not worry about it unless it goes lower. The causes can be worn bearings, but if they were that loose you would hear a know for a second on cold start. Have you checked the pressure with a mechanical gauge to verify the notoriously inaccurate electric system
Before you spend money on a new gauge. Get an oil pressure testing gauge for $20 , remove the oil pressure sending unit and test the oil pressure. If oil pressure at idle and 3000 rpm's is a-ok via spec's ( big money repair items) then its either the gauge a clogged or defective sending unit or the circuitry. (little money repair items)
You can also have this done at a repair shop.
nothing ..normal low pressure at idle while hot ...but really should be thinking fresh oil change and filter soon..also what are the RPM's at idle hot in gear with A/C radio and other accessories running?