If you want to get technical, a motor is run with electricity and an engine is run by burning a fuel, like gasoline, but people use the terms interchangeably when referring to car engines.
Knocking noises are never a good sign, especially when they show up suddenly, but the first thing is to have someone listen to it to tell if it's serious. Loud knocking noises can be caused by damaged connecting rod bearings. Once one of them starts to deteriorate, they fail completely within a few minutes. At the same time the oil pressure will drop to almost 0 psi. You would see that on the dash gauge or warning light. Once this happens, the only thing you'll accomplish by continuing to try to drive the car is to reduce the number of miles you'll have to walk to get help. With low oil pressure, more parts will be damaged and that will make finding a good used engine a better value than trying to rebuild your engine.
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Wednesday, April 29th, 2015 AT 6:10 PM