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Just recently I heard a knocking sound like something was coming loose or a rod

(1990 Chevrolet 1500 Pickup)
in Fort Smith, AR on December 24, 2011
I checked the oil and was 1 quart low since then the noise has gotten worse like a loud knocking but only when your driving.I have pulled off the valve covers and restarted the engine and realized I am not seeing any oil pumping to the lifters or rods could this be the oil pump
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It's not OK to run the engine with no oil getting up to the rockers. It sounds like damage has already occurred if you are already hearing a noise. You will have to start disassemble to figure out why you have lubrication failure. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
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