Question about 1994 Chevrolet Astro

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Knock in cold motor

Clatter or knock on cold days usually quits after warm up,doesn't hurt motor performance,doesn't always knock

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Sounds like you have a lifter or two sticking. They act as shock absorbers between the engine cam and end of the valve stem. When the oil is cold and they stick in the compressed mode that leaves a space between the lifter and the valve stem which causes a clicking sound till the oil warms up and the lifter comes unstuck.

Posted on Apr 17, 2014

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Not really an issue as I have already said in the other thread.

Posted on Apr 17, 2014

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1 Answer

When i accelerate my motor clatters. it doesn't


A clattering sound could be a knock sensor. They are made to tell you there is a problem with the engine or it could just need to be replaced. If you dont have any fault codes or loss of power you might just need a new one but start at the simple spots first. Check the serpentine belt and make sure its on tight check your intake manifold and exhaust manifold for leaks and make sure the sound your hearing is not a bad lifter or rod. You can remove the valve cover and visually inspect most small cars. Check all of your fluid levels because if your low on oil it will cause this aswell

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