why would 1992 chevy pickup knock when started

Hello arkiegirl95--  I've heard of this happening before with Chevy engines.  If it goes right away as the car warms up you probably have more of an annoyance than a long term problem.  Beyond that it could be a bearing, the oil pump, the throttle sensor, an oil leak or maybe sticky fuel injectors- who knows?  That is something for a skilled mechanic to take a look at in person. The mechanic will help you decide on the proper course of action.  Good luck from Bovan.

when cold the lifters some times stick i have a red chevy 1500 ext cab does the same thing u can put an addative called seafolm put in the crank case and the knocking should go away

it could be that u mite need a oil change....change the viscosity of the oil....add some oil...a labor knock....or the lifters....thats the order that i would check it out in...