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It could be a valve lifter. It also could be a rod bearing. In either case, replacing the whole engine is more drastic than you actually need to go. Replacing bearings can be done...
Most probably the lifter has gone bad, but if it is a LOUD knocking sound, it is possible one of the crankshaft / connecting rod bearings has been damaged. Usually a bad valve gives more of a "clicking" sound.
A bad camshaft lobe will also cause a "knocking" sound usually with an engine with high mileage.
Oh yea, lifters can be replaced , best if you replace cam an lifters together ! Loud knocking is not usually associated with lifters , they usually make a ticking noise ! Knocking noise is most usually in the bottom of the motor , main or rod bearings . most of the time rod bearings !
sounds like a sticky lifter that sometimes is mistaken for a knock chevys are notorious for them and can run forever on it. check the oil for grits or metal flakes
it means that you need to research either a different car, or a different engine for this car. A loud knocking noise indicates a connecting rod is loose, and your engine has little to no time left before the rod or endcap breaks, completely messing up your engine, and making it very difficult to change. If you must drive it, drive it slow, and be super gentle with the gas...like you're driving on ice. If it's more of a ticking noise, that could be a lifter, but a loud hollow sounding knock is a rod. You may also have a check engine light showing up on the dash from the knock sensor.
If the engine knock is coming from deep inside the engine, the I agree, the rod is knocking. If the sound is coming from closer to the top, it could be a valve lifter or push rod you are hearing. This isn't as bad, they last longer and synthetic oil or oil treatment helps. If this doesn't happen all the time, if it's occasional or you hear a pinging noise, you could just have a bad knock sensor.
maybe a hydraulic lifter or a central bearing.... do you hav trouble accelarating at all? if its they hydraulic lifter, you will be fine for about 90k miles and even then nothing serious will happen, its just annoying. if its the central bearing on your motor, then you will have anywhere from 0-3000 miles left until your engine shuts down on you and your car stops moving. for me it's the hydraulic lifter witch triggered the knock sensor, which is there to detect knocks for oil related problems but unfortunaetly picked up my knocking too and thus went into its "energy saving" mode and slowed accelaration down ALOT in order to protect my motor. of course since it was a hydraulic lifter, this was pointless to me. if this is your case just take it to a mechanic and pay $40 to get the knock sensor unplugged. this won't solve the knocking itself but it will allow the car to accelarate at w/e speed you want. THIS IS NOT the solution to every knocking/ticking problem. there are MANY different ones out there so the best way is to get it checked out by a mechanic.
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