Could be any of several things. If it's a bad bearing, especially a connecting rod bearing, it could trash your engine if it fails completely. It could also be less catastrophic, but it needs to be checked out.
SOURCE: Loud ticking/knocking/rattling sound when I start/accelerate
hi is it miss-firing as it sounds like a knocking noise can be anything but if you can feel it on the accelerater pedal then the noise sounds like its on the inlet valve side which would transfere the noise up the throttle body where the accelerater is located it could be something as simple as a tappet come loose to a burned valve you need to have a look do a compression test and take the rocker cover off see if theres anything come loose yates210456
SOURCE: oil light flashing/engine knocking
you are abouot to lose the motor,,,,you have a rod knocking when you start it up and an oil pump wont help it been there done that all it does it make it worse
SOURCE: 2000 saturn upper engine knocking
noise is caused by lack of oil to lifters, or worn timeing chain. if noise is from lifters it should go away wit proper oil level, if still there needs timeing chain.
SOURCE: 2004 Nissan Quest - Engine chatter/knocking
Ther e is a chance your injectors are leakin g down and there is excess fuel in the cylinders. Not a good thing. So, you fuel pressure and injectors need chkg. good luck
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