Question about 1994 Chevrolet Astro

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Motor noise knock in motor sometimes when cold or start up

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As long as it goes away within a few seconds don't worry about it. If it was a bearing problem it would knock every time it was started cold, not just now and then.

Posted on Apr 17, 2014

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2005 Nissan Altima knocking noise when engine starts.


By chance did you check your oil level. That would be ideal before your engine blows out. If that is fine, more in likely it maybe normal. Some GM vehicles do that also due to the cold weather. After sitting for a long period of time the oil will settle in the oil pan til you crank up. The knocking noise may last for 5-10 sec then it stops because the oil is lubricating the pistons again. But if it is constant and oil level is good, get a mechanic to check it out. Hope this helps.

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