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Engine noise,valve making a tapping sound - 2000 Buick LeSabre

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If the noise speeds up with the speed of the engine, it's a faulty valve lifter.

Posted on Sep 29, 2009

  • Richard Delahant Sep 29, 2009

    Could also be a loose rocker arm.

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Engine got a knocking cold start, silint when hot


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NOISE WHEN COLD THEN GOES AWAY WHEN WARMS UP,SOMEONE SAID MAIN BEARINGS GOING BAD


Hard to say over the internet but I will try to explain. If the noise is a distict KNOCK KNOCK and it sounds like it is coming from the bottom of the engine, then it most likely is a rod or main bearing. If it is a TAP TAP noise that sounds like it's coming from the top of the engine, then most likely a valve lifer is failing/failed.
the fact that it goes away when the car is warm, makes me lean towards a bad lifter. Normaly if a bearing is bad and knocking, the noise doesn't go away.

The KNOCK noise will be somewhat hollow sounding and the TAP TAP sound will be more solid. If the KNOCK KNOCK is solid, then a rod or main bearing has most likely failed to the point that a new/reman engine will be needed.

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Most likely cause is a hydralic tappet. Mits are well know for top end noise. Note we are talking about a tapping or clicking sound not a knock. You can try using an engine flush product if the noise is getting bad and then changing your oil. Generally if the oil is not changed regularily eventually the tapping noise gets happens.

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Tapping on the top of an engine is caused by excess valve tappet clearance.

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Make sure the oil is not low first, this sounds like valve trane noise, check the valve rocker clearances they may be loose.

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Check Utube for lifter tap, valve tap, and rod bearing noise. If you pull each spark plug one at a time, plugging it back in after each one, the tapping will go away if it's a rod bearing. At any rate, on your next oil change add some valve-medic or similar additive for valve noise. Make sure you follow direction or you will get massive lifter tap if you pour it into a cold engine.

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