Question about 1997 Geo Metro
Engine has knocking noise. Oil is good. Noise started suddenly and does not change. Had valve cover gasket replace a month ago.
Engine knock Huh? In order to qualify the term "Knock", Let me get you to perform some simple task/observation. Typically, if you hear a noise on top of your motor that can be described as a light knock, usually going tap, tap, tap, tapping along at double the tempo, of your motor spinning, Your oil pump may be having trouble getting oil to the top where the valve's and rocker arms are. If you hear a "Knock" by bending over or kneeling beside one of your "front wheel well's"and stick your head up to the well, providing a vantage point to "hear" whats going on at the lower part of the engine. A knock from here will/can indicate a potentially overheated, under lubricated, rod or crank bearing that could seize the motor. This (theretical) crank bearing would be sounding off at half the tempo of the rocker arms above., with a deep, dark klunk that would defintly present itself as the sort of noise that damages metal parts. Now, that being said.....common sense goes a long way, people....1.) Most people are aware of the maintenance that has been performed on a particular engine, the quality and quantity of that maint. and when the last time it was ran out of oil or water. For those who fall into the " lack of maintenence" catagory, you probably already know why your engine or driveline sound as it does. If you happen to take particulary good care of your car, there is a good chance that whatever noise or "happening" might be going on, it'll be much easier to remedy. There are always exceptions to every rule. Remember, its not what will happen, it's what can happen. Take care of your car, and it will take care of you. Theroad
Posted on Jul 17, 2009
Not a good sign; I had a similar occurence with a '95 Saturn and thought it was a vibrating exhaust system, it wasn't.
Thirty miles later, the car was started after a refreshment stop and the engine failed, dumping oil all over the parking lot. A connecting rod cap had come loose and finally fallen into the oil pan causing the affected piston to stop its travel and subsequently the dangling connecting rod was hit by the crankshaft which then broke. Dead at 57,600 miles.
Posted on Jul 16, 2009
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Posted on Jan 02, 2017
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