i think the dealer screwed me because he said there was nothing wrong with it.... he must have put something into it when you test drove it.
knocking noise
engine knocking hard,and shaking a bit
NO. A knocking noise in the engine is a problem in the engine.
yes. Depending on how long the engine was allowed to run low on oil, it may have suffered serious damage which would shorten it's life span.
It sounds like you threw a Rod
When you accelerate. you are putting presure on the main engine barrens. if they are going bad. You will hear this knocking sound. I don't know how many miles you have on this engine. But that's what it sounds like. But that's not all that can make this sound. You will have to tell more about it and when it started. Did it just start all at once? or did it start and then get louder?
if you have an electrical fuel pump can sometimes do that
Engine knocking can be caused by numerous things. Having the incorrect spark plugs, carbon deposits on the cylinder walls, and being low on engine oil may all cause a knocking sound.
if your engine is knocking that means you need oil. go get an oil change or add a quart asap or the engine will burn out
if the engine is knocking really loud you probably need to overhaul the entire engine or get a new or used engine because loud knocking is not good
Detonation involves a supersonic exothermic. Knocking in a engine is spark-ignition internal combustion.
Serious engine knock or valve train noise. Have this looked into by a pro.