There is a loud knocking noise for about 2 min. till the engine warms up on my 2001 Buick Century?

Question:
it is very loud and getting worse. there are only 39,000 miles on it. what could it be?

Answers:

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It could be a faulty radiator or a knock sensor that has stopped the fan speed. I remember in 2000 there was a recall on some century's and the problem still persisted for about 6 months. If I were you I would take it to a GM dealer and pay 70.00 dollars to have them check your engine out and if you let them fix the problen the $70 is applied towards that total.

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When was the last time you checked your engine oil level?

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Sounds like bad things have happened. Rod bearing? Crank bearing?

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Some 3.1 V-6 engines do have piston noise when cold because of the skirt-less design.but its nothing to worry about

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It could be bad main bearings, bad rod bearings, bad wrist pin, could be any number of things, you should get it to a repair shop before you cause unrepairable damage

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Sounds like your lifter's are going bad. When the oil pressure builds up the hydrolic lifters get full and the noise disappears. Have the same problem with my truck. But I do have 112,649 miles on it. Could also be your oil pump not getting oil to the lifters fast enough. Mine sounds like I have a diesel till it warms up a bit then runs fine.

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Its called piston slap.As the engine warms the piston expands & noise goes away.If it is too loud have it fixed.Not a cheap repair though.

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This could be a number of things including exhaust leak, best to have it checked but it's a Buick good luck.

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sounds like the oil pump.
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