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Replace the FilterImmediately replace the filter, and top the fluid level off. It may be defective or the wrong kind. Replace it with an OEM AC/Delco filter to be sure you have the correct filter. AC/Delco filters are very highly rated filters I recommend you use them on your Chevy.

Better answer-Change the oil to synthetic oil! The knock you are hearing is the piston skirts slapping the sleeve due to dry start! Mine did the same thing with conventional oil!

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โˆ™ 2010-04-19 18:54:45
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Q: Just had an oil changed and now the engine knocks at start up on 2001 Silverado?
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Your engine knocks when you cold start it because the motor oil is not viscous enough to lubricate crank bearings, cylinders, etc. warm it up first, engine will last alot longer

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A 2000 Silverado 5.3 Vortec that is hard to start and misses on one side of the engine might have a problem with the coil pack or the spark plugs. It could also mean that the block is cracked if the engine is prone to overheating.

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check fuel pump it could have come loose if not its bad replace

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