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I have a '91 Lumina with a 3.1 Tuned port. I know that the 3.1 uses push rods & therefore it most likely has hydraulic lifters. If this is so, it's possible that one or more of your hydraulic lifters is collapsed/leaky. The lifter is just a little rubber cylider filled w/oil, designed to soften the blow of the cam ramming the push rod up onto the rocker arm & also to delay the retraction of the push rod so that kinetic force & momentum won't cause the push rod & cam & rocker arm to lose contact with one another, ( & therefore knock). If the hydraulic lifter is collapsed/leaky, it will create a gap in the cam/push rod/lifter/rocker arm contact chain until the oil pressure comes up to it's regular pressure shortly after startup, at which time the lifter will fill with oil & expand to fill the gap. But on startup & just as you turn off the engine, the oil pressure is low & therefore the bad lifter causes a knock when it's empty. Watch your oil pressure gauge & see if the times of low pressure does indeed correspond to the time when it knocks. This is just a therory of mine mind you, I could very well be wrong. But I thought I'd throw this idea out there & see what you think! Good luck! Don

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โˆ™ 2007-06-25 07:27:19
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Q: What would cause your 1992 chev lumina to make short knocking noise in engine on start up until turning engine off then knocking again?
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