Question about 2001 Chevrolet Metro

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2001 Chevy Metro

Getting a loud tapping noise more noticable at speeds above 40,sounds like lifters,gets quiter when you let off the gas,maybe valve springs?

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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.

Posted on Oct 29, 2008

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A loud knocking noise like you've described if it's in the lower end of the engine, is usually a Crankshaft Rod Bearing. If the knocking noise is in the top end of the engine, it is usually a lifter or a rocker arm. Either one doesn't sound good and can be expensive. You can continue driving until it stops completely or you can do as the autozone suggested and use an oil thickner such as STP although none of them work very long or quiet them down for long.

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Call him up, it sounds like that head is going to have to come off again. You definitely have a serious problem at # 7. Maybe a valve keeper that wasn't all the way in or possibly a bad lifter. Either way, don't drive it until it's fixed, it'll just make it worse.

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Could be lifter noise...valve cams, parts of the engine, are supposed to move the valves up and down to let in air and let out exhaust...there are lifters that good between the cams and the valves to make sure the valves are tight against the cams, they maintain the tightness even when things wear...when the lifter stops doing its job, it lets a gap form between the valve and the cam, and a tapping is heard, actually metal hitting against metal...this could be from the lifter being damaged, dirty, or starved for oil...make sure your oil level is right, make sure the oil is clean...sometimes a dirty lifter can benefit from a fresh oil change...if the tapping keeps up, damage can occur to the valve ends or cam shaft...you probably wouldn't notice the engine not running as well, unless damage occurred that caused to valve to stop working...there are lots of other sounds from the engine that are bad, like persistent knocking, which is a piston in the act of breaking, and not so bad like ignition knocking from using too low an octane gas...depending on the engine type, tapping could be lived with for years, and sometimes lifter replacement, if needed, can be fairly inexpensive...good luck...

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SOMETIMES IT IS CAUSED BY THE OIL USED! THE WAY YOU DESCRIBE IT SOUNDS NATURAL, BUT YOU MIGHT CHECK THE TAPPET ADJUSTMENT! ONE OR TWO MIGHT BE A FRACTION LOOSE! THIS IS EASY TO DO, BUT REQUIRES YOU TO REMOVE THE VALVE COVERS AND WIGGLE THE TAPPETS BY HAND! TOO MUCH FREE PLAY CAN CAUSE THEM TO MAKE NOISE! YOU CAN ADJUST THEM UP A LITTLE, BUT DON'T OVER TIGHTEN THEM, OR YOU CAN DAMAGE YOUR LIFTERS! CHECK YOUR LAST OIL CHANGE, AND IF NEEDED, YOU MIGHT CHANGE TO A HIGH MILEAGE SYNTHETIC OIL LIKE MOBILE ONE, IN A 10W-30! 10W-40 IS TOO THIN FOR THAT TYPE OF ENGINE!

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yes hydrailic and no will not affect engine. Engine problem is just more noticed when transmission not engaged.
Squealing is probably pilot bearing--not a big deal.
Tapping--maybe lifters pumping up
Engine light--get car scanned and report trouble codes back to us.
Autozone and Advance, among other parts stores, offer free scans.

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Lifter


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