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Try starting now. If knocking still, turn off immediately. Pull the engine oil dip stick with the engine off and check the oil level. If a foamy brown fluid (or droplets of water) is on the dip stick and it appears overfilled then water got into your oil and may have damaged the motor. You may be lucky if you have the oil/water mix removed and fresh oil and filter installed. Try running then and see if any better.
1. Is the knocking coming from the engine, the transmission or elsewhere?
2. If you believe it is from the engine, start the motor and put the auto in neutral and gradually depress the accelerator pedal to gently increase the engine speed for 2 minutes. If you can replicate the knocking noise then obviously it is engine.
3. If the knocking is from the engine check the engine oil level which you should be doing frequently anyhow to ensure you top it up and do not run the oil level low and destroy the motor. (Failure to have the engine oil changed at the required intervals can also result in excessive wear and damage to engine components.) If you do this check and find the oil level is very low then advise here when you repost your query with more information about the source of the knocking sound.
4. Also indicate in your post what grade (octane rating) of fuel you are running the engine on.
sorry
the low/no oil has caused bearing failure
repairs will reveal that you need new bearings,
rod and possible new crankshaft if the damage is severe
it comes as a cost for not doing the simple practice of not checking oil and water levels at least weekly
A knocking motor is not a good thing, Because that could be a loose piston rod or a play in the crankshaft and i the advice is do not run your engine until you get somebody to locate the knocking,If not then you engine will get ruined. and the repair manual will not help you locate the knocking. also the engine has to have enough oil not low not full. Good luck bro
run low on oil by the sound of it ,,secondhand lump from scrapyard best soloution.if tisw an auto it could be the flex plate behind the torque converter
Most likely it is a rod bearing and motor would have to be dissassembled to diagnose, you might want think about installing a low milege used replacment since it was run 5 quarts low on motor oil.
This sounds like severe engine damage, do to loss of internal lubrication (no oil). That's the bad thing about 'idiot' warning lights, they come on when u have a severe problem, and the damage is done. You are going to probably have to purchase a used engine from an auto salvage yard, or purchase a re -manufactured engine. Sorry for the bad news, this is about as bad as it gets.
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