I can drive my 94 buick lesabre around for about a hour before the car warms up to the right temperature before a knocking noise from the engine starts does anyone know what can be causing this it runs real quiet until the car warms up?
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If the pressure is low it will turn the light on. If you have a light and hear knocking it's a sign that a rod or main bearing has worn to the point that it's allowing oil to escape from the crank, thereby lowering pressure to all other components. There is no "fix" for that short of a bearing replacement, Expensive, and most times not worthwhile as debris from the bearing gets into the oiling passages and causes more problems shortly after the repair. Best option is a scrapyard engine or total rebuild.
That knocking noise could be due to low oil. There could be a leak on the following places - drain plug, on the crankshaft seals, camshaft seals, valve cover gasket, engine may be burning oil (blow by) due to bad piston rings, bad, valve seals. Regularly check your engine oil level and tap off to avoid engine failure.
Tell somebody to rev the motor and check where the problem is from, otherwise remove serpentine belt, if it's a supercharged model remove supercharged belt before, and remove the accessories belt ! tell him to start the motor a short time to see it the knock sound is there or not, if not check each pulley if there's any loose or strange noise while turning them !
Could be two things, your oil pump pick tube is clog, oil pan would have to be drop to check, or your camshaft bearing worn causing low oil pressure,I would not say piston rod bearing or main bearing, cause there's no knock noise. You will have better oil pressure when cold due to oil much thicker. so I would forget about a bad oil pump.
if you can turn the serpentine belt either direction by hand at all you probably need a harmonic balancer..or just look in the passenger wheelwell at the h/balencer and see if the rubber is cracked all the way around.. just fixed one with that issue
checkout the oil sending unit for the most part its close to the oil filter also checkout this website to see if they have your car listed its www.autozone.com and if they do you be able to get pictures and diagrams showing you parts on your car
There is the possibility the oil sending unit might be bad, but it is more likely that the oil preasure drops to a dangerous level when the engine is warm and the oil thins out. It would be advisable to take it to a shop and have them check the oil preasure with a remote preasure guage just to be sure before it could cause major and very expensive damage.