okay the problem i have is really annoying me. i know my silverados but this one is got me stumped. i tried finding info online but not going anywhere. here is the problem. i have a 97 silverado with 178000 miles it has the 5-7 vorteck. the truck runs and drives like a champ. when i start the truck in the morning it knocks for about up to five minutes and then goes away. it has good oil pressure and the oil i use is 10w 30 valvoline. with ac delco filter. the oil is not low. i live in south dakota and its winter right now. once the truck is warmed up i dont hear anything. but when its parked all day and i go to start it again it knocks again. what can it be. is it piston slap or csk is there a way to fix it. should i run 5 30 in it. use a different brand of oil. i know its winter and i should use 5 30 but with 178000 miles that shouldnt matter. the motor is well broke in by then. and advice on this will help.
Jan 30, 2011 at 10:58 PM